KOP_e.pdf

s
Preface,
Contents
Bit Logic Instructions 1
Comparison Instructions 2
Conversion Instructions 3
Counter Instructions 4
Data Block Instructions 5
Logic Control Instructions 6
Integer Math Instructions 7
Floating Point Math
Instructions 8
Move Instructions 9
Program Control Instructions 10
Shift and Rotate Instructions 11
Status Bit Instructions 12
Timer Instructions 13
Word Logic Instructions 14
Appendix
Overview of All LAD
Instructions A
SIMATIC
Ladder Logic (LAD) for
S7-300 and S7-400
Programming
Reference Manual
This manual is part of the documentation
package with the order number:
6ES7810-4CA08-8BW1
Programming Examples B
Edition 03/2006
A5E00706949-01
Working with Ladder Logic
C
Index

Siemens AG
Automation and Drives
Postfach 4848
90437 NÜRNBERG
GERMANY
A5E00706949-01
03/2006
Copyright © Siemens AG 2006
Technical data subject to change
Safety Guidelines
This manual contains notices you have to observe in order to ensure your personal safety, as well as to
prevent damage to property. The notices referring to your personal safety are highlighted in the manual
by a safety alert symbol, notices referring to property damage only have no safety alert symbol. The
notices shown below are graded according to the degree of danger.
! Danger
indicates that death or severe personal injury will result if proper precautions are not taken.
! Warning
indicates that death or severe personal injury may result if proper precautions are not taken.
! Caution
with a safety alert symbol indicates that minor personal injury can result if proper precautions are not
taken.
Caution
without a safety alert symbol indicates that property damage can result if proper precautions are not
taken.
Notice
indicates that an unintended result or situation can occur if the corresponding notice is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of
danger will be used. A notice warning of injury to persons with a safety alert symbol may also include a
warning relating to property damage.
Qualified Personnel
The device/system may only be set up and used in conjunction with this documentation. Commissioning
and operation of a device/system may only be performed by qualified personnel. Within the context of
the safety notices in this documentation qualified persons are defined as persons who are authorized to
commission, ground and label devices, systems and circuits in accordance with established safety
practices and standards.
Prescribed Usage
Note the following:
!
Warning
This device and its components may only be used for the applications described in the catalog or the
technical description, and only in connection with devices or components from other manufacturers
which have been approved or recommended by Siemens.
Correct, reliable operation of the product requires proper transport, storage, positioning and assembly
as well as careful operation and maintenance.
Trademarks
All names identified by ® are registered trademarks of the Siemens AG.
The remaining trademarks in this publication may be trademarks whose use by third parties for their
own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and
software described. Since variance cannot be precluded entirely, we cannot guarantee full consistency.
However, the information in this publication is reviewed regularly and any necessary corrections are
included in subsequent editions.

Ladder Logic (LAD) for S7-300 and S7-400 Programming
A5E00706949-01 iii
Preface
Purpose
This manual is your guide to creating user programs in the Ladder Logic (LAD)
programming language.
This manual also includes a reference section that describes the syntax and
functions of the language elements of Ladder Logic.
Basic Knowledge Required
The manual is intended for S7 programmers, operators, and maintenance/service
personnel.
In order to understand this manual, general knowledge of automation technology is
required.
In addition to, computer literacy and the knowledge of other working equipment
similar to the PC (e.g. programming devices) under the operating systems
MS Windows 2000 Professional, MS Windows XP Professional or MS Windows
Server 2003 are required.
Scope of the Manual
This manual is valid for release 5.4 of the STEP 7 programming software package.
Compliance with IEC 1131-3
LAD corresponds to the “Ladder Logic” language defined in the International
Electrotechnical Commission's standard IEC 1131-3. For further details, refer to the
table of standards in the STEP 7 file NORM_TBL.WRI.

Preface
iv A5E00706949-01
Requirements
To use this Ladder Logic manual effectively, you should already be familiar with the
theory behind S7 programs which is documented in the online help for STEP 7.
The language packages also use the STEP 7 standard software, so you should be
familiar with handling this software and have read the accompanying
documentation.
This manual is part of the documentation package "STEP 7 Reference".
The following table displays an overview of the STEP 7 documentation:
Documentation Purpose Order Number
STEP 7 Basic Information with
• Working with STEP 7,
Getting Started Manual
• Programming with STEP 7
• Configuring Hardware and
Communication Connections,
STEP 7
• From S5 to S7, Converter Manual
Basic information for technical
personnel describing the methods
of implementing control tasks with
STEP 7 and the S7-300/400
programmable controllers.
6ES7810-4CA08-8BW0
STEP 7 Reference with
• Ladder Logic (LAD) / Function Block
Diagram (FDB) / Statement List (STL)
for S7-300/400 manuals
• Standard and System Function
for S7-300/400
Volume 1 and Volume 2
Provides reference information
and describes the programming
languages LAD, FBD and STL,
and standard and system function
extending the scope of the
STEP 7 basic information.
6ES7810-4CA08-8BW1
Online Helps Purpose Order Number
Help on STEP 7 Basic information on
programming and configuring
hardware with STEP 7 in the form
of an online help.
Part of the STEP 7
Standard software.
Reference helps on AWL/KOP/FUP
Reference help on SFBs/SFCs
Reference help on Organization Blocks
Context-sensitive reference
information.
Part of the STEP 7
Standard software.

Preface
A5E00706949-01 v
Online Help
The manual is complemented by an online help which is integrated in the software.
This online help is intended to provide you with detailed support when using the
software.
The help system is integrated in the software via a number of interfaces:
• The context-sensitive help offers information on the current context, for
example, an open dialog box or an active window. You can open the context-
sensitive help via the menu command Help > Context-Sensitive Help, by
pressing F1 or by using the question mark symbol in the toolbar.
• You can call the general Help on STEP 7 using the menu command Help >
Contents or the "Help on STEP 7" button in the context-sensitive help window.
• You can call the glossary for all STEP 7 applications via the "Glossary" button.
This manual is an extract from the "Help on Ladder Logic". As the manual and the
online help share an identical structure, it is easy to switch between the manual
and the online help.
Further Support
If you have any technical questions, please get in touch with your Siemens
representative or responsible agent.
You will find your contact person at:
http://www.siemens.com/automation/partner
You will find a guide to the technical documentation offered for the individual
SIMATIC Products and Systems here at:
http://www.siemens.com/simatic-tech-doku-portal
The online catalog and order system is found under:
http://mall.automation.siemens.com/
Training Centers
Siemens offers a number of training courses to familiarize you with the SIMATIC
S7 automation system. Please contact your regional training center or our central
training center in D 90327 Nuremberg, Germany for details:
Telephone: +49 (911) 895-3200.
Internet: http://www.sitrain.com

Preface
vi A5E00706949-01
Technical Support
You can reach the Technical Support for all A&D products
• Via the Web formula for the Support Request
http://www.siemens.com/automation/support-request
• Phone: + 49 180 5050 222
• Fax: + 49 180 5050 223
Additional information about our Technical Support can be found on the Internet
pages http://www.siemens.com/automation/service
Service & Support on the Internet
In addition to our documentation, we offer our Know-how online on the internet at:
http://www.siemens.com/automation/service&support
where you will find the following:
• The newsletter, which constantly provides you with up-to-date information on
your products.
• The right documents via our Search function in Service & Support.
• A forum, where users and experts from all over the world exchange their
experiences.
• Your local representative for Automation & Drives.
• Information on field service, repairs, spare parts and more under "Services".

A5E00706949-01 vii
Contents
1 Bit Logic Instructions .................................................................................................... 1-1
1.1 Overview of Bit Logic Instructions .................................................................... 1-1
1.2 ---| |--- Normally Open Contact (Address) ..................................................... 1-2
1.3 ---| / |--- Normally Closed Contact (Address)................................................... 1-3
1.4 XOR Bit Exclusive OR ..................................................................................... 1-4
1.5 --|NOT|-- Invert Power Flow.............................................................................. 1-5
1.6 ---( ) Output Coil............................................................................................. 1-6
1.7 ---( # )--- Midline Output................................................................................... 1-8
1.8 ---( R ) Reset Coil........................................................................................... 1-10
1.9 ---( S ) Set Coil............................................................................................... 1-12
1.10 RS Reset-Set Flip Flop.................................................................................. 1-14
1.11 SR Set-Reset Flip Flop.................................................................................. 1-16
1.12 ---( N )--- Negative RLO Edge Detection ....................................................... 1-18
1.13 ---( P )--- Positive RLO Edge Detection......................................................... 1-19
1.14 ---(SAVE) Save RLO into BR Memory........................................................... 1-20
1.15 NEG Address Negative Edge Detection........................................................ 1-21
1.16 POS Address Positive Edge Detection.......................................................... 1-22
1.17 Immediate Read ............................................................................................. 1-23
1.18 Immediate Write.............................................................................................. 1-24
2 Comparison Instructions............................................................................................... 2-1
2.1 Overview of Comparison Instructions............................................................... 2-1
2.2 CMP ? I Compare Integer................................................................................ 2-2
2.3 CMP ? D Compare Double Integer.................................................................. 2-4
2.4 CMP ? R Compare Real.................................................................................. 2-6
3 Conversion Instructions................................................................................................ 3-1
3.1 Overview of Conversion Instructions................................................................ 3-1
3.2 BCD_I BCD to Integer ..................................................................................... 3-2
3.3 I_BCD Integer to BCD ..................................................................................... 3-3
3.4 I_DINT Integer to Double Integer .................................................................... 3-4
3.5 BCD_DI BCD to Double Integer ...................................................................... 3-5
3.6 DI_BCD Double Integer to BCD ...................................................................... 3-6
3.7 DI_REAL Double Integer to Floating-Point...................................................... 3-7
3.8 INV_I Ones Complement Integer .................................................................... 3-8
3.9 INV_DI Ones Complement Double Integer ..................................................... 3-9
3.10 NEG_I Twos Complement Integer................................................................. 3-10
3.11 NEG_DI Twos Complement Double Integer.................................................. 3-11
3.12 NEG_R Negate Floating-Point Number......................................................... 3-12
3.13 ROUND Round to Double Integer ................................................................. 3-13
3.14 TRUNC Truncate Double Integer Part........................................................... 3-14
3.15 CEIL Ceiling................................................................................................... 3-15
3.16 FLOOR Floor ................................................................................................. 3-16

Contents
viii A5E00706949-01
4 Counter Instructions...................................................................................................... 4-1
4.1 Overview of Counter Instructions ..................................................................... 4-1
4.2 S_CUD Up-Down Counter............................................................................... 4-3
4.3 S_CU Up Counter............................................................................................ 4-5
4.4 S_CD Down Counter ....................................................................................... 4-7
4.5 ---( SC ) Set Counter Value ............................................................................. 4-9
4.6 ---( CU ) Up Counter Coil............................................................................... 4-10
4.7 ---( CD ) Down Counter Coil .......................................................................... 4-12
5 Data Block Instructions................................................................................................. 5-1
5.1 ---(OPN) Open Data Block: DB or DI............................................................... 5-1
6 Logic Control Instructions ............................................................................................ 6-1
6.1 Overview of Logic Control Instructions............................................................. 6-1
6.2 ---(JMP)--- Unconditional Jump ....................................................................... 6-2
6.3 ---(JMP)--- Conditional Jump ........................................................................... 6-3
6.4 ---( JMPN ) Jump-If-Not ................................................................................... 6-4
6.5 LABEL Label.................................................................................................... 6-5
7 Integer Math Instructions .............................................................................................. 7-1
7.1 Overview of Integer Math Instructions.............................................................. 7-1
7.2 Evaluating the Bits of the Status Word with Integer Math Instructions............. 7-2
7.3 ADD_I Add Integer........................................................................................... 7-3
7.4 SUB_I Subtract Integer.................................................................................... 7-4
7.5 MUL_I Multiply Integer..................................................................................... 7-5
7.6 DIV_I Divide Integer......................................................................................... 7-6
7.7 ADD_DI Add Double Integer ........................................................................... 7-7
7.8 SUB_DI Subtract Double Integer..................................................................... 7-8
7.9 MUL_DI Multiply Double Integer...................................................................... 7-9
7.10 DIV_DI Divide Double Integer ....................................................................... 7-10
7.11 MOD_DI Return Fraction Double Integer ...................................................... 7-11
8 Floating Point Math Instructions.................................................................................. 8-1
8.1 Overview of Floating-Point Math Instruction..................................................... 8-1
8.2 Evaluating the Bits of the Status Word with Floating-Point Math Instructions.. 8-2
8.3 Basic Instructions.............................................................................................. 8-3
8.3.1 ADD_R Add Real............................................................................................. 8-3
8.3.2 SUB_R Subtract Real...................................................................................... 8-5
8.3.3 MUL_R Multiply Real....................................................................................... 8-6
8.3.4 DIV_R Divide Real........................................................................................... 8-7
8.3.5 ABS Establish the Absolute Value of a Floating-Point Number ...................... 8-8
8.4 Extended Instructions ....................................................................................... 8-9
8.4.1 SQR Establish the Square............................................................................... 8-9
8.4.2 SQRT Establish the Square Root.................................................................. 8-10
8.4.3 EXP Establish the Exponential Value............................................................ 8-11
8.4.4 LN Establish the Natural Logarithm............................................................... 8-12
8.4.5 SIN Establish the Sine Value......................................................................... 8-13
8.4.6 COS Establish the Cosine Value................................................................... 8-14
8.4.7 TAN Establish the Tangent Value ................................................................. 8-15
8.4.8 ASIN Establish the Arc Sine Value................................................................ 8-16
8.4.9 ACOS Establish the Arc Cosine Value.......................................................... 8-17
8.4.10 ATAN Establish the Arc Tangent Value......................................................... 8-18

Contents
A5E00706949-01 ix
9 Move Instructions .......................................................................................................... 9-1
9.1 MOVE Assign a Value ..................................................................................... 9-1
10 Program Control Instructions..................................................................................... 10-1
10.1 Overview of Program Control Instructions...................................................... 10-1
10.2 ---(Call) Call FC SFC from Coil (without Parameters) ................................... 10-2
10.3 CALL_FB Call FB from Box........................................................................... 10-4
10.4 CALL_FC Call FC from Box .......................................................................... 10-6
10.5 CALL_SFB Call System FB from Box ........................................................... 10-8
10.6 CALL_SFC Call System FC from Box......................................................... 10-10
10.7 Call Multiple Instance.................................................................................... 10-12
10.8 Call Block from a Library............................................................................... 10-13
10.9 Important Notes on Using MCR Functions................................................... 10-13
10.10 ---(MCR<) Master Control Relay On............................................................ 10-14
10.11 ---(MCR>) Master Control Relay Off............................................................ 10-16
10.12 ---(MCRA) Master Control Relay Activate ................................................... 10-18
10.13 ---(MCRD) Master Control Relay Deactivate............................................... 10-19
10.14 ---(RET) Return............................................................................................ 10-20
11 Shift and Rotate Instructions...................................................................................... 11-1
11.1 Shift Instructions ............................................................................................. 11-1
11.1.1 Overview of Shift Instructions ......................................................................... 11-1
11.1.2 SHR_I Shift Right Integer .............................................................................. 11-2
11.1.3 SHR_DI Shift Right Double Integer ............................................................... 11-4
11.1.4 SHL_W Shift Left Word.................................................................................. 11-5
11.1.5 SHR_W Shift Right Word............................................................................... 11-7
11.1.6 SHL_DW Shift Left Double Word .................................................................. 11-8
11.1.7 SHR_DW Shift Right Double Word ............................................................... 11-9
11.2 Rotate Instructions........................................................................................ 11-11
11.2.1 Overview of Rotate Instructions.................................................................... 11-11
11.2.2 ROL_DW Rotate Left Double Word............................................................. 11-11
11.2.3 ROR_DW Rotate Right Double Word.......................................................... 11-13
12 Status Bit Instructions................................................................................................. 12-1
12.1 Overview of Statusbit Instructions .................................................................. 12-1
12.2 OV ---| |--- Exception Bit Overflow ............................................................... 12-2
12.3 OS ---| |--- Exception Bit Overflow Stored ................................................... 12-3
12.4 UO ---| |--- Exception Bit Unordered ............................................................ 12-5
12.5 BR ---| |--- Exception Bit Binary Result ........................................................ 12-6
12.6 ==0 ---| |--- Result Bit Equal 0...................................................................... 12-7
12.7 <>0 ---| |--- Result Bit Not Equal 0 ............................................................... 12-8
12.8 >0 ---| |--- Result Bit Greater Than 0............................................................ 12-9
12.9 <0 ---| |--- Result Bit Less Than 0 .............................................................. 12-10
12.10 >=0 ---| |--- Result Bit Greater Equal 0 ...................................................... 12-11
12.11 <=0 ---| |--- Result Bit Less Equal 0 ........................................................... 12-12

Contents
x A5E00706949-01
13 Timer Instructions........................................................................................................ 13-1
13.1 Overview of Timer Instructions....................................................................... 13-1
13.2 Location of a Timer in Memory and Components of a Timer ......................... 13-2
13.3 S_PULSE Pulse S5 Timer............................................................................. 13-5
13.4 S_PEXT Extended Pulse S5 Timer............................................................... 13-7
13.5 S_ODT On-Delay S5 Timer........................................................................... 13-9
13.6 S_ODTS Retentive On-Delay S5 Timer ...................................................... 13-11
13.7 S_OFFDT Off-Delay S5 Timer .................................................................... 13-13
13.8 ---( SP ) Pulse Timer Coil............................................................................. 13-15
13.9 ---( SE ) Extended Pulse Timer Coil ............................................................ 13-17
13.10 ---( SD ) On-Delay Timer Coil...................................................................... 13-19
13.11 ---( SS ) Retentive On-Delay Timer Coil...................................................... 13-21
13.12 ---( SF ) Off-Delay Timer Coil ...................................................................... 13-23
14 Word Logic Instructions.............................................................................................. 14-1
14.1 Overview of Word logic instructions ............................................................... 14-1
14.2 WAND_W (Word) AND Word ........................................................................ 14-2
14.3 WOR_W (Word) OR Word............................................................................. 14-3
14.4 WAND_DW (Word) AND Double Word......................................................... 14-4
14.5 WOR_DW (Word) OR Double Word ............................................................. 14-5
14.6 WXOR_W (Word) Exclusive OR Word.......................................................... 14-6
14.7 WXOR_DW (Word) Exclusive OR Double Word........................................... 14-7
A Overview of All LAD Instructions.................................................................................A-1
A.1 LAD Instructions Sorted According to English Mnemonics (International).......A-1
A.2 LAD Instructions Sorted According to German Mnemonics (SIMATIC)...........A-4
B Programming Examples B-1
B.1 Overview of Programming Examples ...............................................................B-1
B.2 Example: Bit Logic Instructions ........................................................................B-2
B.3 Example: Timer Instructions .............................................................................B-6
B.4 Example: Counter and Comparison Instructions............................................B-10
B.5 Example: Integer Math Instructions................................................................B-13
B.6 Example: Word Logic Instructions..................................................................B-14
C Working with Ladder Logic C-1
C.1 EN/ENO Mechanism.........................................................................................C-1
C.1.1 Adder with EN and with ENO Connected........................................................ C-3
C.1.2 Adder with EN and without ENO Connected................................................... C-4
C.1.3 Adder without EN and with ENO Connected................................................... C-5
C.1.4 Adder without EN and without ENO Connected.............................................. C-6
C.2 Parameter Transfer...........................................................................................C-7
Index Index-1

A5E00706949-01 1-1
1 Bit Logic Instructions
1.1 Overview of Bit Logic Instructions
Description
Bit logic instructions work with two digits, 1 and 0. These two digits form the base
of a number system called the binary system. The two digits 1 and 0 are called
binary digits or bits. In the world of contacts and coils, a 1 indicates activated or
energized, and a 0 indicates not activated or not energized.
The bit logic instructions interpret signal states of 1 and 0 and combine them
according to Boolean logic. These combinations produce a result of 1 or 0 that is
called the ”result of logic operation” (RLO).
The logic operations that are triggered by the bit logic instructions perform a variety
of functions.
There are bit logic instructions to perform the following functions:
• ---| |--- Normally Open Contact (Address)
• ---| / |--- Normally Closed Contact (Address)
• ---(SAVE) Save RLO into BR Memory
• XOR Bit Exclusive OR
• ---( ) Output Coil
• ---( # )--- Midline Output
• ---|NOT|--- Invert Power Flow
The following instructions react to an RLO of 1:
• ---( S ) Set Coil
• ---( R ) Reset Coil
• SR Set-Reset Flip Flop
• RS Reset-Set Flip Flop
Other instructions react to a positive or negative edge transition to perform the
following functions:
• ---(N)--- Negative RLO Edge Detection
• ---(P)--- Positive RLO Edge Detection
• NEG Address Negative Edge Detection
• POS Address Positive Edge Detection
• Immediate Read
• Immediate Write

Bit Logic Instructions
1-2 A5E00706949-01
1.2 ---| |--- Normally Open Contact (Address)
Symbol
<address>
---| |---
Parameter Data Type Memory Area Description
<address> BOOL I, Q, M, L, D, T, C Checked bit
Description
---| |--- (Normally Open Contact) is closed when the bit value stored at the
specified <address> is equal to "1". When the contact is closed, ladder rail power
flows across the contact and the result of logic operation (RLO) = "1".
Otherwise, if the signal state at the specified <address> is "0", the contact is open.
When the contact is open, power does not flow across the contact and the result of
logic operation (RLO) = "0".
When used in series, ---| |--- is linked to the RLO bit by AND logic. When used in
parallel, it is linked to the RLO by OR logic.
Status word
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - X X X 1
Example
I 0.0 I 0.1
I 0.2
Power flows if one of the following conditions exists:
The signal state is "1" at inputs I0.0 and I0.1
Or the signal state is "1" at input I0.2

A5E00706949-01 1-3
1.3 ---| / |--- Normally Closed Contact (Address)
Symbol
<address>
---| / |---
<address> BOOL I, Q, M, L, D, T, C Checked bit
Description
---| / |--- (Normally Closed Contact) is closed when the bit value stored at the
specified <address> is equal to "0". When the contact is closed, ladder rail power
flows across the contact and the result of logic operation (RLO) = "1".
Otherwise, if the signal state at the specified <address> is "1", the contact is
opened. When the contact is opened, power does not flow across the contact and
the result of logic operation (RLO) = "0".
When used in series, ---| / |--- is linked to the RLO bit by AND logic. When used in
parallel, it is linked to the RLO by OR logic.
Status word
writes: - - - - - X X X 1
Example
I 0.0 I 0.1
I 0.2
Power flows if one of the following conditions exists:
Or the signal state is "1" at input I0.2

1-4 A5E00706949-01
1.4 XOR Bit Exclusive OR
For the XOR function, a network of normally open and normally closed contacts
must be created as shown below.
Symbols
<address1> <address2>
<address1> <address2>
<address1> BOOL I, Q, M, L, D, T,
C
Scanned bit
<address2 BOOL I, Q, M, L, D, T,
C
Scanned bit
Description
XOR (Bit Exclusive OR) creates an RLO of "1" if the signal state of the two
specified bits is different.
Example
I 0.0
I 0.0 I 0.1
Q 4.0
I 0.1
The output Q4.0 is "1" if (I0.0 = "0" AND I0.1 = "1") OR (I0.0 = "1" AND I0.1 = "0").

A5E00706949-01 1-5
1.5 --|NOT|-- Invert Power Flow
Symbol
---|NOT|---
Description
---|NOT|--- (Invert Power Flow) negates the RLO bit.
Status word
writes: - - - - - - 1 X -
Example
I 0.0
NOT
I 0.2
I 0.1
Q 4.0
The signal state of output Q4.0 is "0" if one of the following conditions exists:
The signal state is "1" at input I0.0
Or the signal state is "1" at inputs I0.1 and I0.2.

1-6 A5E00706949-01
1.6 ---( ) Output Coil
Symbol
<address>
---( )
<address> BOOL I, Q, M, L, D Assigned bit
Description
---( ) (Output Coil) works like a coil in a relay logic diagram. If there is power flow
to the coil (RLO = 1), the bit at location <address> is set to "1". If there is no power
flow to the coil (RLO = 0), the bit at location <address> is set to "0". An output coil
can only be placed at the right end of a ladder rung. Multiple output elements
(max. 16) are possible (see example). A negated output can be created by using
the ---|NOT|--- (invert power flow) element.
MCR (Master Control Relay) dependency
MCR dependency is activated only if an output coil is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on and there is power flow to
an output coil; the addressed bit is set to the current status of power flow. If the
MCR is off, a logic "0" is written to the specified address regardless of power flow
status.
Status word
writes: - - - - - 0 X - 0

A5E00706949-01 1-7
Example
I 0.0 I 0.1
I 0.2
Q 4.0
Q 4.1
I 0.3
Or the signal state is "0" at input I0.2.
Or the signal state is "0" at input I0.2 and "1" at input I0.3
If the example rungs are within an activated MCR zone:
When MCR is on, Q4.0 and Q4.1 are set according to power flow status as
described above.
When MCR is off (=0), Q4.0 and Q4.1 are reset to 0 regardless of power flow.

1-8 A5E00706949-01
1.7 ---( # )--- Midline Output
Symbol
<address>
---( # )---
<address> BOOL I, Q, M, *L, D Assigned bit
* An L area address can only be used if it is declared TEMP in the variable
declaration table of a logic block (FC, FB, OB).
Description
---( # )--- (Midline Output) is an intermediate assigning element which saves the
RLO bit (power flow status) to a specified <address>. The midline output element
saves the logical result of the preceding branch elements. In series with other
contacts, ---( # )--- is inserted like a contact. A ---( # )--- element may never be
connected to the power rail or directly after a branch connection or at the end of a
branch. A negated ---( # )--- can be created by using the ---|NOT|--- (invert power
flow) element.
MCR dependency is activated only if a midline output coil is placed inside an active
MCR zone. Within an activated MCR zone, if the MCR is on and there is power
flow to a midline output coil; the addressed bit is set to the current status of power
flow. If the MCR is off, a logic "0" is written to the specified address regardless of
power flow status.
Status word
writes: - - - - - 0 X - 1

A5E00706949-01 1-9
Example
M 1.1 M 2.2 Q 4.0
I 1.0 I 1.1
M 1.1 has the RLO
M 0.0 has the RLO
M 2.2 has the RLO of the entire bit logic combination
I 1.0 I 1.1 I 2.2 I 1.3
M 0.0
I 1.0 I 1.1 I 2.2 I 1.3
NOT
( )
(#) (#)
NOT
(#) NOT

1-10 A5E00706949-01
1.8 ---( R ) Reset Coil
Symbol
<address>
---( R )
<address> BOOL I, Q, M, L, D, T, C Reset bit
Description
---( R ) (Reset Coil) is executed only if the RLO of the preceding instructions is "1"
(power flows to the coil). If power flows to the coil (RLO is "1"), the specified
<address> of the element is reset to "0". A RLO of "0" (no power flow to the coil)
has no effect and the state of the element's specified address remains unchanged.
The <address> may also be a timer (T no.) whose timer value is reset to "0" or a
counter (C no.) whose counter value is reset to "0".
MCR dependency is activated only if a reset coil is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on and there is power flow to a
reset coil; the addressed bit is reset to the "0" state. If the MCR is off, the current
state of the element's specified address remains unchanged regardless of power
flow status.
Status word
writes: - - - - - 0 X - 0

A5E00706949-01 1-11
Example
I 0.0 I 0.1
I 0.2
R
Q 4.0
T1
I 0.3
C1
I 0.4
R
R
Network 3
Network 2
Network 1
The signal state of output Q4.0 is reset to "0" if one of the following conditions
exists:
If the RLO is "0", the signal state of output Q4.0 remains unchanged.
The signal state of timer T1 is only reset if:
the signal state is "1" at input I0.3.
The signal state of counter C1 is only reset if:
the signal state is "1" at input I0.4.
When MCR is on, Q4.0, T1, and C1 are reset as described above.
When MCR is off, Q4.0, T1, and C1 are left unchanged regardless of RLO state
(power flow status).

1-12 A5E00706949-01
1.9 ---( S ) Set Coil
Symbol
<address>
---( S )
<address> BOOL I, Q, M, L, D Set bit
Description
---( S ) (Set Coil) is executed only if the RLO of the preceding instructions is "1"
(power flows to the coil). If the RLO is "1" the specified <address> of the element
is set to "1".
An RLO = 0 has no effect and the current state of the element's specified address
remains unchanged.
MCR dependency is activated only if a set coil is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on and there is power flow to a
set coil; the addressed bit is set to the "1" state. If the MCR is off, the current state
of the element's specified address remains unchanged regardless of power flow
status.
Status word
writes: - - - - - 0 X - 0

A5E00706949-01 1-13
Example
I 0.0 I 0.1
I 0.2
S
Q 4.0
If the RLO is "0", the signal state of output Q4.0 remains unchanged.
When MCR is on, Q4.0 is set as described above.
When MCR is off, Q4.0 is left unchanged regardless of RLO state (power flow
status).

1-14 A5E00706949-01
1.10 RS Reset-Set Flip Flop
Symbol
RS
S Q
<address>
R
<address> BOOL I, Q, M, L, D Set or reset bit
S BOOL I, Q, M, L, D Enabled reset instruction
R BOOL I, Q, M, L, D Enabled reset instruction
Q BOOL I, Q, M, L, D Signal state of <address>
Description
RS (Reset-Set Flip Flop) is reset if the signal state is "1" at the R input, and "0" at
the S input. Otherwise, if the signal state is "0" at the R input and "1" at the S input,
the flip flop is set. If the RLO is "1" at both inputs, the order is of primary
importance. The RS flip flop executes first the reset instruction then the set
instruction at the specified <address>, so that this address remains set for the
remainder of program scanning.
The S (Set) and R (Reset) instructions are executed only when the RLO is "1".
RLO "0" has no effect on these instructions and the address specified in the
instruction remains unchanged.
MCR dependency is activated only if a RS flip flop is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on, the addressed bit is reset to
"0" or set to "1" as described above. If the MCR is off, the current state of the
specified address remains unchanged regardless of input states.
Status word
writes: - - - - - x x x 1

A5E00706949-01 1-15
Example
RS
R Q
M 0.0
S
I 0.0
I 0.1
Q 4.0
If the signal state is "1" at input I0.0 and "0" at I0.1, memory bit M0.0 is set and
output Q4.0 is "0". Otherwise, if the signal state at input I0.0 is "0" and at I0.1 is "1",
memory bit M0.0 is reset and output Q4.0 is "1". If both signal states are "0",
nothing is changed. If both signal states are "1", the set instruction dominates
because of the order; M0.0 is set and Q4.0 is "1".
If the example is within an activated MCR zone:
When MCR is on, Q4.0 is reset or set as described above.
When MCR is off, Q4.0 is left unchanged regardless of input states.

1-16 A5E00706949-01
1.11 SR Set-Reset Flip Flop
Symbol
SR
S Q
<address>
R
<address> BOOL I, Q, M, L, D Set or reset bit
S BOOL I, Q, M, L, D Enable set instruction
R BOOL I, Q, M, L, D Enable reset instruction
Q BOOL I, Q, M, L, D Signal state of <address>
Description
SR (Set-Reset Flip Flop) is set if the signal state is "1" at the S input, and "0" at the
R input. Otherwise, if the signal state is "0" at the S input and "1" at the R input, the
flip flop is reset. If the RLO is "1" at both inputs, the order is of primary importance.
The SR flip flop executes first the set instruction then the reset instruction at the
specified <address>, so that this address remains reset for the remainder of
program scanning.
The S (Set) and R (Reset) instructions are executed only when the RLO is "1".
RLO "0" has no effect on these instructions and the address specified in the
instruction remains unchanged.
MCR dependency is activated only if a SR flip flop is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on ; the addressed bit is set to
"1" or reset to "0" as described above. If the MCR is off, the current state of the
specified address remains unchanged regardless of input states.
Status word
BR CC1 CC0 OV OS OR STA RLO /FC
writes: - - - - - x x x 1

A5E00706949-01 1-17
Example
SR
S Q
M 0.0
R
I 0.0
I 0.1
Q 4.0
If the signal state is "1" at input I0.0 and "0" at I0.1, memory bit M0.0 is set and
output Q4.0 is "1". Otherwise, if the signal state at input I0.0 is "0" and at I0.1 is "1",
memory bit M0.0 is reset and output Q4.0 is "0". If both signal states are "0",
nothing is changed. If both signal states are "1", the reset instruction dominates
because of the order; M0.0 is reset and Q4.0 is "0".
If the example is within an activated MCR zone:
When MCR is on, Q4.0 is set or reset as described above.
When MCR is off, Q4.0 is left unchanged regardless of input states.

1-18 A5E00706949-01
1.12 ---( N )--- Negative RLO Edge Detection
Symbol
<address>
---( N )
<address> BOOL I, Q, M, L, D Edge memory bit, storing the
previous signal state of RLO
Description
---( N )--- (Negative RLO Edge Detection) detects a signal change in the address
from "1" to "0" and displays it as RLO = "1" after the instruction. The current signal
state in the RLO is compared with the signal state of the address, the edge
memory bit. If the signal state of the address is "1" and the RLO was "0" before the
instruction, the RLO will be "1" (pulse) after this instruction, and "0" in all other
cases. The RLO prior to the instruction is stored in the address.
Status word
writes: - - - - - 0 x x 1
Example
N
M 0.0
I 0.0 I 0.1
I 0.2
JMP
CAS1
The edge memory bit M0.0 saves the old RLO state. When there is a signal
change at the RLO from "1" to "0", the program jumps to label CAS1.

A5E00706949-01 1-19
1.13 ---( P )--- Positive RLO Edge Detection
Symbol
<address>
---( P )---
<address> BOOL I, Q, M, L, D Edge memory bit, storing the
previous signal state of RLO
Description
---( P )--- (Positive RLO Edge Detection) detects a signal change in the address
from "0" to "1" and displays it as RLO = "1" after the instruction. The current signal
state in the RLO is compared with the signal state of the address, the edge
memory bit. If the signal state of the address is "0" and the RLO was "1" before the
instruction, the RLO will be "1" (pulse) after this instruction, and "0" in all other
cases. The RLO prior to the instruction is stored in the address.
Status word
writes: - - - - - 0 X X 1
Example
CAS1
P
M 0.0
JMP
I 0.0 I 0.1
I 0.2
The edge memory bit M0.0 saves the old RLO state. When there is a signal
change at the RLO from "0" to "1", the program jumps to label CAS1.

1-20 A5E00706949-01
1.14 ---(SAVE) Save RLO into BR Memory
Symbol
---( SAVE )
Description
---(SAVE) (Save RLO into BR Memory) saves the RLO to the BR bit of the status
word. The first check bit /FC is not reset. For this reason, the status of the BR bit is
included in the AND logic operation in the next network.
For the instruction "SAVE" (LAD, FBD, STL), the following applies and not the
recommended use specified in the manual and online help:
We do not recommend that you use SAVE and then check the BR bit in the same
block or in subordinate blocks, because the BR bit can be modified by many
instructions occurring inbetween. It is advisable to use the SAVE instruction before
exiting a block, since the ENO output (= BR bit) is then set to the value of the RLO
bit and you can then check for errors in the block.
Status word
writes: X - - - - - - - -
Example
SAVE
I 0.0 I 0.1
I 0.2
The status of the rung (=RLO) is saved to the BR bit.
BR Binary Result Bit (Status Word, Bit 8)

A5E00706949-01 1-21
1.15 NEG Address Negative Edge Detection
Symbol
NEG
M_BIT
Q
<address1>
<address2>
<address1> BOOL I, Q, M, L, D Scanned signal
<address2> BOOL I, Q, M, L, D M_BIT edge memory bit, storing
the previous signal state of
<address1>
Q BOOL I, Q, M, L, D One shot output
Description
NEG (Address Negative Edge Detection) compares the signal state of <address1>
with the signal state from the previous scan, which is stored in <address2>. If the
current RLO state is "1" and the previous state was "0" (detection of rising edge),
the RLO bit will be "1" after this instruction.
Status word
writes: - - - - - x 1 x 1
Example
NEG
M_BIT
Q
I 0.3
M 0.0
I 0.0
( )
I 0.1 I 0.2 I 0.4 Q 4.0
The signal state at output Q4.0 is "1" if the following conditions exist:
• The signal state is "1" at inputs I0.0 and I0.1 and I0.2
• And there is a negative edge at input I0.3
• And the signal state is "1" at input I0.4

1-22 A5E00706949-01
1.16 POS Address Positive Edge Detection
Symbol
POS
M_BIT
Q
<address1>
<address2>
<address1> BOOL I, Q, M, L, D Scanned signal
<address2> BOOL I, Q, M, L, D M_BIT edge memory bit, storing
the previous signal state of
<address1>
Q BOOL I, Q, M, L, D One shot output
Description
POS (Address Positive Edge Detection) compares the signal state of <address1>
with the signal state from the previous scan, which is stored in <address2>. If the
current RLO state is "1" and the previous state was "0" (detection of rising edge),
the RLO bit will be "1" after this instruction.
Status word
writes: - - - - - x 1 x 1
Example
POS
M_BIT
Q
I 0.3
M 0.0
I 0.0
( )
I 0.1 I 0.2 I 0.4 Q 4.0
The signal state at output Q4.0 is "1" if the following conditions exist:
• The signal state is "1" at inputs I0.0 and I0.1 and I0.2
• And there is a positive edge at input I0.3
• And the signal state is "1" at input I0.4

A5E00706949-01 1-23
1.17 Immediate Read
Description
For the Immediate Read function, a network of symbols must be created as shown
in the example below.
For time-critical applications, the current state of a digital input may be read faster
than the normal case of once per OB1 scan cycle. An Immediate Read gets the
state of a digital input from an input module at the time the Immediate Read rung is
scanned. Otherwise, you must wait for the end of the next OB1 scan cycle when
the I memory area is updated with the P memory state.
To perform an immediate read of an input (or inputs) from an input module, use the
peripheral input (PI) memory area instead of the input (I) memory area. The
peripheral input memory area can be read as a byte, a word, or a double word.
Therefore, a single digital input cannot be read via a contact (bit) element.
To conditionally pass voltage depending on the status of an immediate input:
1. A word of PI memory that contains the input data of concern is read by the
CPU.
2. The word of PI memory is then ANDed with a constant that yields a non-zero
result if the input bit is on ("1").
3. The accumulator is tested for non-zero condition.
Example
Ladder Network with Immediate Read of Peripheral Input I1.1
WAND_W
EN
OUT
IN2
ENO
IN1
16#0002
PIW1
MWx *
I 4.1 <>0 I 4.5
* MWx has to be specified in order to be able to store the network. x may be any
permitted number.
Description of WAND_W instruction:
PIW1 0000000000101010
W#16#0002 0000000000000010
Result 0000000000000010
In this example immediate input I1.1 is in series with I4.1 and I4.5.
The word PIW1 contains the immediate status of I1.1. PIW1 is ANDed with
W#16#0002. The result is not equal to zero if I1.1 (second bit) in PB1 is true ("1").
The contact A<>0 passes voltage if the result of the WAND_W instruction is not
equal to zero.

1-24 A5E00706949-01
1.18 Immediate Write
Description
For the Immediate Write function, a network of symbols must be created as shown
in the example below.
For time-critical applications, the current state of a digital output may have to be
sent to an output module faster than the normal case of once at the end of the OB1
scan cycle. An Immediate Write writes to a digital output to a input module at the
time the Immediate Write rung is scanned. Otherwise, you must wait for the end of
the next OB1 scan cycle when the Q memory area is updated with the P memory
state.
To perform an immediate write of an output (or outputs) to an output module, use
the peripheral output (PQ) memory area instead of the output (Q) memory area.
The peripheral output memory area can be read as a byte, a word, or a double
word. Therefore, a single digital output cannot be updated via a coil element. To
write the state of a digital output to an output module immediately, a byte, word, or
double word of Q memory that contains the relevant bit is conditionally copied to
the corresponding PQ memory (direct output module addresses).
! Caution
• Since the entire byte of Q memory is written to an output module, all outputs
bits in that byte are updated when the immediate output is performed.
• If an output bit has intermediate states (1/0) occurring throughout the program
that should not be sent to the output module, Immediate Writes could cause
dangerous conditions (transient pulses at outputs) to occur.
• As a general design rule, an external output module should only be referenced
once in a program as a coil. If you follow this design rule, most potential
problems with immediate outputs can be avoided.

A5E00706949-01 1-25
Example
Ladder network equivalent of Immediate Write to peripheral digital output module 5,
channel 1.
The bit states of the addressed output Q byte (QB5) are either modified or left
unchanged. Q5.1 is assigned the signal state of I0.1 in network 1. QB5 is copied to
the corresponding direct peripheral output memory area (PQB5).
The word PIW1 contains the immediate status of I1.1. PIW1 is ANDed with
W#16#0002. The result is not equal to zero if I1.1 (second bit) in PB1 is true ("1").
The contact A<>0 passes voltage if the result of the WAND_W instruction is not
equal to zero.
I 0.1 Q 5.1
Network 1
MOVE
IN
ENO
EN
OUT
QB5 PQB5
Network 2
In this example Q5.1 is the desired immediate output bit.
The byte PQB5 contains the immediate output status of the bit Q5.1.
The other 7 bits in PQB5 are also updated by the MOVE (copy) instruction.

1-26 A5E00706949-01

A5E00706949-01 2-1
2 Comparison Instructions
2.1 Overview of Comparison Instructions
Description
IN1 and IN2 are compared according to the type of comparison you choose:
== IN1 is equal to IN2
<> IN1 is not equal to IN2
> IN1 is greater than IN2
< IN1 is less than IN2
>= IN1 is greater than or equal to IN2
<= IN1 is less than or equal to IN2
If the comparison is true, the RLO of the function is "1". It is linked to the RLO of a
rung network by AND if the compare element is used in series, or by OR if the box
is used in parallel.
The following comparison instructions are available:
• CMP ? I Compare Integer
• CMP ? D Compare Double Integer
• CMP ? R Compare Real

Comparison Instructions
2-2 A5E00706949-01
2.2 CMP ? I Compare Integer
Symbols
CMP
== I
IN2
IN1
CMP
<> I
IN2
IN1
CMP
< I
IN2
IN1
CMP
> I
IN2
IN1
CMP
<= I
IN2
IN1
CMP
>= I
IN2
IN1
box input BOOL I, Q, M, L, D Result of the previous logic
operation
box output BOOL I, Q, M, L, D Result of the comparison, is only
processed further if the RLO at
the box input = 1
IN1 INT I, Q, M, L, D
or constant
First value to compare
or constant
Second value to compare
Description
CMP ? I (Compare Integer) can be used like a normal contact. It can be located at
any position where a normal contact could be placed. IN1 and IN2 are compared
according to the type of comparison you choose.
If the comparison is true, the RLO of the function is "1". It is linked to the RLO of
the whole rung by AND if the box is used in series, or by OR if the box is used in
parallel.
Status word
writes: x x x 0 - 0 x x 1

A5E00706949-01 2-3
Example
CMP
>= I
IN2
IN1
MW2
MW0
I 0.1
S
Q 4.0
I 0.0
Output Q4.0 is set if the following conditions exist:
• There is a signal state of "1" at inputs I0.0 and at I0.1
• AND MW0 >= MW2

2-4 A5E00706949-01
2.3 CMP ? D Compare Double Integer
Symbols
CMP
== D
IN2
IN1
CMP
<> D
IN2
IN1
CMP
< D
IN2
IN1
CMP
> D
IN2
IN1
CMP
<= D
IN2
IN1
CMP
>= D
IN2
IN1
operation
the box input = 1
IN1 DINT I, Q, M, L, D
or constant
or constant
Description
CMP ? D (Compare Double Integer) can be used like a normal contact. It can be
located at any position where a normal contact could be placed. IN1 and IN2 are
compared according to the type of comparison you choose.
If the comparison is true, the RLO of the function is "1". It is linked to the RLO of a
rung network by AND if the compare element is used in series, or by OR if the box
is used in parallel.
Status word
writes: x x x 0 - 0 x x 1

A5E00706949-01 2-5
Example
CMP
>= D
IN2
IN1
MD4
MD0
I 0.1
S
Q 4.0
I 0.0 I 0.2
• And MD0 >= MD4
• And there is a signal state of"1" at input I0.2

2-6 A5E00706949-01
2.4 CMP ? R Compare Real
Symbols
CMP
== R
IN2
IN1
CMP
<> R
IN2
IN1
CMP
< R
IN2
IN1
CMP
> R
IN2
IN1
CMP
<= R
IN2
IN1
CMP
>= R
IN2
IN1
operation
the box input = 1
IN1 REAL I, Q, M, L, D
or constant
or constant
Description
CMP ? R (Compare Real) can be used like a normal contact. It can be located at
any position where a normal contact could be placed. IN1 and IN2 are compared
according to the type of comparison you choose.
If the comparison is true, the RLO of the function is "1". It is linked to the RLO of
the whole rung by AND if the box is used in series, or by OR if the box is used in
parallel.
Status word
writes: x x x x x 0 x x 1

A5E00706949-01 2-7
Example
CMP
>= R
IN2
IN1
MD4
MD0
I 0.1
S
Q 4.0
I 0.0 I 0.2
• And MD0 >= MD4
• And there is a signal state of"1" at input I0.2

2-8 A5E00706949-01

A5E00706949-01 3-1
3 Conversion Instructions
3.1 Overview of Conversion Instructions
Description
The conversion instructions read the contents of the parameters IN and convert
these or change the sign. The result can be queried at the parameter OUT.
The following conversion instructions are available:
• BCD_I BCD to Integer
• I_BCD Integer to BCD
• BCD_DI BCD to Double Integer
• I_DINT Integer to Double Integer
• DI_BCD Double Integer to BCD
• DI_REAL Double Integer to Floating-Point
• INV_I Ones Complement Integer
• INV_DI Ones Complement Double Integer
• NEG_I Twos Complement Integer
• NEG_DI Twos Complement Double Integer
• NEG_R Negate Floating-Point Number
• ROUND Round to Double Integer
• TRUNC Truncate Double Integer Part
• CEIL Ceiling
• FLOOR Floor

Conversion Instructions
3-2 A5E00706949-01
3.2 BCD_I BCD to Integer
Symbol
BCD_I
ENO
EN
IN OUT
EN BOOL I, Q, M, L, D Enable input
ENO BOOL I, Q, M, L, D Enable output
IN WORD I, Q, M, L, D BCD number
OUT INT I, Q, M, L, D Integer value of BCD number
Description
BCD_I (Convert BCD to Integer) reads the contents of the IN parameter as a three-
digit, BCD coded number (+/- 999) and converts it to an integer value (16-bit). The
integer result is output by the parameter OUT. ENO always has the same signal
state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MW10
BCD_I
ENO
EN
IN OUT MW12
NOT
If input I0.0 is "1" , then the content of MW10 is read as a three-digit BCD coded
number and converted to an integer. The result is stored in MW12. The output
Q4.0 is "1" if the conversion is not executed (ENO = EN = 0).

A5E00706949-01 3-3
3.3 I_BCD Integer to BCD
Symbol
I_BCD
ENO
EN
IN OUT
IN INT I, Q, M, L, D Integer number
OUT WORD I, Q, M, L, D BCD value of integer number
Description
I_BCD (Convert Integer to BCD) reads the content of the IN parameter as an
integer value (16-bit) and converts it to a three-digit BCD coded number (+/- 999).
The result is output by the parameter OUT. If an overflow occurred, ENO will be
"0".
Status word
writes: x - - x x 0 x x 1
Example
Q 4.0
I 0.0
MW10
I_BCD
ENO
EN
IN OUT MW12
NOT
If I0.0 is "1", then the content of MW10 is read as an integer and converted to a
three-digit BCD coded number. The result is stored in MW12. The output Q4.0 is
"1" if there was an overflow, or the instruction was not executed (I0.0 = 0).

3-4 A5E00706949-01
3.4 I_DINT Integer to Double Integer
Symbol
I_DINT
ENO
EN
IN OUT
IN INT I, Q, M, L, D Integer value to convert
OUT DINT I, Q, M, L, D Double integer result
Description
I_DINT (Convert Integer to Double Integer) reads the content of the IN parameter
as an integer (16-bit) and converts it to a double integer (32-bit). The result is
output by the parameter OUT. ENO always has the same signal state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MW10
I_DINT
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MW10 is read as an integer and converted to a
double integer. The result is stored in MD12. The output Q4.0 is "1" if the
conversion is not executed (ENO = EN = 0).

A5E00706949-01 3-5
3.5 BCD_DI BCD to Double Integer
Symbol
BCD_DI
ENO
EN
IN OUT
IN DWORD I, Q, M, L, D BCD number
OUT DINT I, Q, M, L, D Double integer value of BCD
number
Description
BCD_DI (Convert BCD to Double Integer) reads the content of the IN parameter as
a seven-digit, BCD coded number (+/- 9999999) and converts it to a double integer
value (32-bit). The double integer result is output by the parameter OUT. ENO
always has the same signal state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MD8
BCD_DI
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1" , then the content of MD8 is read as a seven-digit BCD coded number
and converted to a double integer. The result is stored in MD12. The output Q4.0 is
"1" if the conversion is not executed (ENO = EN = 0).

3-6 A5E00706949-01
3.6 DI_BCD Double Integer to BCD
Symbol
DI_BCD
ENO
EN
IN OUT
IN DINT I, Q, M, L, D Double integer number
OUT DWORD I, Q, M, L, D BCD value of a double integer
number
Description
DI_BCD (Convert Double Integer to BCD) reads the content of the IN parameter as
a double integer (32-bit) and converts it to a seven-digit BCD coded number
(+/- 9999999). The result is output by the parameter OUT. If an overflow occurred,
ENO will be "0".
Status word
Example
Q 4.0
I 0.0
MD8
DI_BCD
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MD8 is read as a double integer and converted to
a seven-digit BCD number. The result is stored in MD12. The output Q4.0 is "1" if
an overflow occurred, or the instruction was not executed (I0.0 = 0).

A5E00706949-01 3-7
3.7 DI_REAL Double Integer to Floating-Point
Symbol
DI_REAL
ENO
EN
IN OUT
IN DINT I, Q, M, L, D Double integer value to convert
OUT REAL I, Q, M, L, D Floating-point number result
Description
DI_REAL (Convert Double Integer to Floating-Point) reads the content of the IN
parameter as a double integer and converts it to a floating-point number. The result
is output by the parameter OUT. ENO always has the same signal state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MD8
DI_REAL
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MD8 is read as an double integer and converted to
a floating-point number. The result is stored in MD12. The output Q4.0 is "1" if the
conversion is not executed (ENO = EN = 0).

3-8 A5E00706949-01
3.8 INV_I Ones Complement Integer
Symbol
INV_I
ENO
EN
IN OUT
IN INT I, Q, M, L, D Integer input value
OUT INT I, Q, M, L, D Ones complement of the integer
IN
Description
INV_I (Ones Complement Integer) reads the content of the IN parameter and
performs a Boolean XOR function with the hexadecimal mask W#16#FFFF. This
instruction changes every bit to its opposite state. ENO always has the same signal
state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MW8
INV_I
ENO
EN
IN OUT MW10
NOT
If I0.0 is "1", then every bit of MW8 is reversed, for example:
MW8 = 01000001 10000001 results in MW10 = 10111110 01111110.
The output Q4.0 is "1" if the conversion is not executed (ENO = EN = 0).

A5E00706949-01 3-9
3.9 INV_DI Ones Complement Double Integer
Symbol
INV_DI
ENO
EN
IN OUT
IN DINT I, Q, M, L, D Double integer input value
OUT DINT I, Q, M, L, D Ones complement of the double
integer IN
Description
INV_DI (Ones Complement Double Integer) reads the content of the IN parameter
and performs a Boolean XOR function with the hexadecimal mask W#16#FFFF
FFFF .This instruction changes every bit to its opposite state. ENO always has the
same signal state as EN.
Status word
writes: 1 - - - - 0 1 1 1
Example
Q 4.0
I 0.0
MD8
INV_DI
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then every bit of MD8 is reversed, for example:
MD8 = F0FF FFF0 results in MD12 = 0F00 000F.

3-10 A5E00706949-01
3.10 NEG_I Twos Complement Integer
Symbol
NEG_I
ENO
EN
IN OUT
IN INT I, Q, M, L, D Integer input value
OUT INT I, Q, M, L, D Twos complement of integer IN
Description
NEG_I (Twos Complement Integer) reads the content of the IN parameter and
performs a twos complement instruction. The twos complement instruction is
equivalent to multiplication by (-1) and changes the sign (for example: from a
positive to a negative value). ENO always has the same signal state as EN with the
following exception: if the signal state of EN = 1 and an overflow occurs, the signal
state of ENO = 0.
Status word
Example
Q 4.0
I 0.0
MW8
NEG_I
ENO
EN
IN OUT MW10
NOT
If I0.0 is "1", then the value of MW8 with the opposite sign is output by the OUT
parameter to MW10.
MW8 = + 10 results in MW10 = - 10.
If the signal state of EN = 1 and an overflow occurs, the signal state of ENO = 0.

A5E00706949-01 3-11
3.11 NEG_DI Twos Complement Double Integer
Symbol
NEG_DI
ENO
EN
IN OUT
IN DINT I, Q, M, L, D Double integer input value
OUT DINT I, Q, M, L, D Twos complement of IN value
Description
NEG_DI (Twos Complement Double Integer) reads the content of the IN parameter
and performs a twos complement instruction. The twos complement instruction is
equivalent to multiplication by (-1) and changes the sign (for example: from a
positive to a negative value). ENO always has the same signal state as EN with the
following exception: if the signal state of EN = 1 and an overflow occurs, the signal
state of ENO = 0.
Status word
Example
Q 4.0
I 0.0
MD8
NEG_DI
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the value of MD8 with the opposite sign is output by the OUT
parameter to MD12.
MD8 = + 1000 results in MD12 = - 1000.
If the signal state of EN = 1 and an overflow occurs, the signal state of ENO = 0.

3-12 A5E00706949-01
3.12 NEG_R Negate Floating-Point Number
Symbol
NEG_R
ENO
EN
IN OUT
IN REAL I, Q, M, L, D Floating-point number input
value
OUT REAL I, Q, M, L, D Floating-point number IN with
negative sign
Description
NEG_R (Negate Floating-Point) reads the contents of the IN parameter and
changes the sign. The instruction is equivalent to multiplication by (-1) and changes
the sign (for example: from a positive to a negative value). ENO always has the
same signal state as EN.
Status word
writes: x - - - - 0 x x 1
Example
Q 4.0
I 0.0
MD8
NEG_R
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the value of MD8 with the opposite sign is output by the OUT
parameter to MD12.
MD8 = + 6.234 results in MD12 = - 6.234.

A5E00706949-01 3-13
3.13 ROUND Round to Double Integer
Symbol
ROUND
ENO
EN
IN OUT
IN REAL I, Q, M, L, D Value to round
OUT DINT I, Q, M, L, D IN rounded to nearest whole
number
Description
ROUND (Round Double Integer) reads the content of the IN parameter as a
floating-point number and converts it to a double integer (32-bit). The result is the
closest integer number ("Round to nearest"). If the floating-point number lies
between two integers, the even number is returned. The result is output by the
parameter OUT. If an overflow occurred ENO will be "0".
Status word
Example
Q 4.0
I 0.0
MD8
ROUND
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MD8 is read as a floating-point number and
converted to the closest double integer. The result of this "Round to nearest"
function is stored in MD12. The output Q4.0 is "1" if an overflow occurred or the
instruction was not executed (I0.0 = 0).

3-14 A5E00706949-01
3.14 TRUNC Truncate Double Integer Part
Symbol
TRUNC
ENO
EN
IN OUT
IN REAL I, Q, M, L, D Floating-point value to convert
OUT DINT I, Q, M, L, D Whole number part of IN value
Description
TRUNC (Truncate Double Integer) reads the content of the IN parameter as a
floating-point number and converts it to a double integer (32-bit). The double
integer result of the ("Round to zero mode") is output by the parameter OUT. If an
overflow occurred, ENO will be "0".
Status word
Example
Q 4.0
I 0.0
MD8
TRUNC
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MD8 is read as a real number and converted to a
double integer. The integer part of the floating-point number is the result and is
stored in MD12. The output Q4.0 is "1" if an overflow occurred, or the instruction
was not executed (I0.0 = 0).

A5E00706949-01 3-15
3.15 CEIL Ceiling
Symbol
CEIL
ENO
EN
IN OUT
OUT DINT I, Q, M, L, D Lowest greater double integer
Description
CEIL (Ceiling) reads the contents of the IN parameter as a floating-point number
and converts it to a double integer (32-bit). The result is the lowest integer which is
greater than the floating-point number ("Round to + infinity"). If an overflow occurs,
ENO will be "0".
Status word
writes*: X - - X X 0 X X 1
writes**: 0 - - - - 0 0 0 1
* Function is executed (EN = 1)
** Function is not executed (EN = 0)
Example
Q 4.0
I 0.0
MD8
CEIL
ENO
EN
IN OUT MD12
NOT
If I0.0 is 1, the contents of MD8 are read as a floating-point number which is
converted into a double integer using the function Round. The result is stored in
MD12. The output Q4.0 is "1" if an overflow occured or the instruction was not
processed (I0.0 = 0).

3-16 A5E00706949-01
3.16 FLOOR Floor
Symbol
FLOOR
ENO
EN
IN OUT
OUT DINT I, Q, M, L, D Greatest lower double integer
Description
FLOOR (Floor) reads the content of the IN parameter as a floating-point number
and converts it to a double integer (32-bit). The result is the greatest integer
component which is lower than the floating-point number ("Round to - infinity"). If
an overflow occurred ENO will be "0".
Status word
Example
Q 4.0
I 0.0
MD8
FLOOR
ENO
EN
IN OUT MD12
NOT
If I0.0 is "1", then the content of MD8 is read as a floating-point number and
converted to a double integer by the round to - infinity mode. The result is stored in
MD12. The output Q4.0 is "1" if an overflow occurred, or the instruction was not
executed (I0.0 = 0).

A5E00706949-01 4-1
4 Counter Instructions
4.1 Overview of Counter Instructions
Area in Memory
Counters have an area reserved for them in the memory of your CPU. This
memory area reserves one 16-bit word for each counter address. The ladder logic
instruction set supports 256 counters.
The counter instructions are the only functions that have access to the counter
memory area.
Count Value
Bits 0 through 9 of the counter word contain the count value in binary code. The
count value is moved to the counter word when a counter is set. The range of the
count value is 0 to 999.
You can vary the count value within this range by using the following counter
instructions:
• S_CUD Up-Down Counter
• S_CD Down Counter
• S_CU Up Counter
• ---( SC ) Set Counter Coil
• ---( CU ) Up Counter Coil
• ---( CD ) Down Counter Coil

Counter Instructions
4-2 A5E00706949-01
Bit Configuration in the Counter
You provide a counter with a preset value by entering a number from 0 to 999, for
example 127, in the following format: C#127. The C# stands for binary coded
decimal format (BCD format: each set of four bits contains the binary code for one
decimal value).
Bits 0 through 11 of the counter contain the count value in binary coded decimal
format.
The following figure shows the contents of the counter after you have loaded the
count value 127, and the contents of the counter cell after the counter has been
set.
irrelevant
Count value in BCD (0 to 999)
1
1
1
0
0
1
0
0
1
0
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
7
2
1
1
1
1
1
1
1
1
0
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
irrelevant Binary count value

A5E00706949-01 4-3
4.2 S_CUD Up-Down Counter
Symbol
S_CUD
S
Q
CV
PV
R
CV_BCD
CU
CD
English German
C no. Z no.
ZAEHLER
S
Q
DUAL
ZW
R
DEZ
ZV
ZR
Parameter
English
Parameter
German
Data Type Memory
Area
Description
C no. Z no. COUNTER C Counter identification
number; range depends on
CPU
CU ZV BOOL I, Q, M, L, D Count up input
CD ZR BOOL I, Q, M, L, D Count down input
S S BOOL I, Q, M, L, D Set input for presetting
counter
PV ZW WORD I, Q, M, L, D
or constant
Enter counter value as
C#<value> in the range
from 0 to 999
PV ZW WORD I, Q, M, L, D Value for presetting
counter
R R BOOL I, Q, M, L, D Reset input
CV DUAL WORD I, Q, M, L, D Current counter value,
hexadecimal number
CV_BCD DEZ WORD I, Q, M, L, D Current counter value,
BCD coded
Q Q BOOL I, Q, M, L, D Status of the counter

4-4 A5E00706949-01
Description
S_CUD (Up-Down Counter) is preset with the value at input PV if there is a positive
edge at input S. If there is a 1 at input R, the counter is reset and the count is set to
zero. The counter is incremented by one if the signal state at input CU changes
from "0" to "1" and the value of the counter is less than "999". The counter is
decremented by one if there is a positive edge at input CD and the value of the
counter is greater than "0".
If there is a positive edge at both count inputs, both instructions are executed and
the count value remains unchanged.
If the counter is set and if RLO = 1 at the inputs CU/CD, the counter will count
accordingly in the next scan cycle, even if there was no change from a positive to a
negative edge or viceversa.
The signal state at output Q is "1" if the count is greater than zero and "0" if the
count is equal to zero.
Status word
writes: - - - - - x x x 1
Note
Avoid to use a counter at several program points (risk of counting errors).
Example
S_CUD
S
Q
CV
PV
R
CV_BCD
CU
CD
Q 4.0
I 0.0
I 0.1
I 0.2
I 0.3 MW10
C10
If I0.2 changes from "0" to "1", the counter is preset with the value of MW10. If the
signal state of I0.0 changes from "0" to "1", the value of counter C10 will be
incremented by one - except when the value of C10 is equal than "999". If I0.1
changes from "0" to "1", C10 is decremented by one - except when the value of
C10 is equal to "0". Q4.0 is "1" if C10 is not equal to zero.

A5E00706949-01 4-5
4.3 S_CU Up Counter
Symbol
S_CU
PV
Q
CV
R
CV_BCD
CU
S
English German
C no. Z no.
Z_VORW
ZW
Q
DUAL
R
DEZ
ZV
S
Parameter
English
Parameter
German
Data Type Memory
Area
Description
C no. Z no. COUNTER C Counter identification num-
ber; range depends of CPU
CU ZV BOOL I, Q, M, L, D Count up input
counter
or constant
from 0 to 999
counter
hexadecimal number
BCD coded
Q Q BOOL I, Q, M, L, D Status of the counter
Description
S_CU (Up Counter) is preset with the value at input PV if there is a positive edge at
input S.
The counter is reset if there is a "1" at input R and the count value is then set to
zero.
The counter is incremented by one if the signal state at input CU changes from "0"
to "1" and the value of the counter is less than "999".
If the counter is set and if RLO = 1 at the inputs CU, the counter will count

4-6 A5E00706949-01
Status word
writes: - - - - - x x x 1
Note
Example
S_CU
S
CV
PV
R CV_BCD
CU
I 0.0
I 0.2
I 0.3
MW10
C10
Q
Q 4.0
incremented by one - unless the value of C10 is equal to "999". Q4.0 is "1" if C10 is
not equal to zero.

A5E00706949-01 4-7
4.4 S_CD Down Counter
Symbol
S_CD
PV
Q
CV
R
CV_BCD
CD
S
English German
C no. Z no.
Z_RUECK
ZW
Q
DUAL
R
DEZ
ZR
S
Parameter
English
Parameter
German
Data Type Memory
Area
Description
C no. Z no. COUNTER C Counter identification num-
ber; range depends of CPU
CD ZR BOOL I, Q, M, L, D Count down input
counter
or constant
from 0 to 999
counter
hexadecimal number
BCD coded
Q Q BOOL I, Q, M, L, D Status counter
Description
S_CD (Down Counter) is set with the value at input PV if there is a positive edge at
input S.
The counter is reset if there is a 1 at input R and the count value is then set to zero.
The counter is decremented by one if the signal state at input CD changes from "0"
to "1" and the value of the counter is greater than zero.
If the counter is set and if RLO = 1 at the inputs CD, the counter will count

4-8 A5E00706949-01
Status word
writes: - - - - - x x x 1
Note
Example
C_CD
S
CV
PV
R CV_BCD
CD
I 0.0
I 0.2
I 0.3
MW10
C10
Q
Q 4.0
decremented by one - unless the value of C10 is equal to "0". Q4.0 is "1" if C10 is
not equal to zero.

A5E00706949-01 4-9
4.5 ---( SC ) Set Counter Value
Symbol
English German
<C no.> <Z no.>
---( SC ) ---( SZ )
<preset
value>
<preset value>
Parameter
English
Parameter
German
Data Type Memory
Area
Description
<C no.> <Z no.> COUNTER C Counter number to be
preset
<preset
value>
<preset
value>
WORD I, Q, M, L, D
or constant
Value for presetting BCD
(0 to 999)
Description
---( SC ) (Set Counter Value) executes only if there is a positive edge in RLO. At
that time, the preset value transferred into the specified counter.
Status word
writes: x - - - - 0 x - 0
Example
I 0.0
SC
C5
C#100
The counter C5 is preset with the value of 100 if there is a positive edge at input
I0.0 (change from "0" to "1"). If there is no positive edge, the value of counter C5
remains unchanged.

4-10 A5E00706949-01
4.6 ---( CU ) Up Counter Coil
Symbol
English German
<C no.> <Z no.>
---( CU ) ---( ZV )
Parameter
English
Parameter
German
Data Type Memory
Area
Description
<C no.> <Z no.> COUNTER C Counter identification
CPU
Description
---( CU ) (Up Counter Coil) increments the value of the specified counter by one if
there is a positive edge in the RLO and the value of the counter is less than "999".
If there is no positive edge in the RLO or the counter already has the value "999",
the value of the counter will be unchanged.
Status word
writes: - - - - - 0 - - 0

A5E00706949-01 4-11
Example
I 0.1 C10
CU
Network 1
Network 2
Network 3
I 0.0 C10
SC
C#100
I 0.2 C10
R
If the signal state of input I0.0 changes from "0" to "1" (positive edge in RLO), the
preset value of 100 is loaded to counter C10.
If the signal state of input I0.1 changes from "0" to "1" (positive edge in RLO),
counter C10 count value will be incremented by one unless the value of C10 is
equal to "999". If there is no positive edge in RLO, the value of C10 will be
unchanged.
If the signal state of I0.2 is "1", the counter C10 is reset to "0".

4-12 A5E00706949-01
4.7 ---( CD ) Down Counter Coil
Symbol
English German
<C no.> <Z no.>
---( CD ) ---( ZD )
Parameter
English
Parameter
German
Data Type Memory
Area
Description
<C no.> <Z no.> COUNTER C Counter identification num-
ber; range depends on
CPU
Description
---( CD ) (Down Counter Coil) decrements the value of the specified counter by
one, if there is a positive edge in the RLO state and the value of the counter is
more than "0". If there is no positive edge in the RLO or the counter has already
the value "0", the value of the counter will be unchanged.
Status word
writes: - - - - - 0 - - 0

A5E00706949-01 4-13
Example
I 0.1
Network 4
Network 3
Network 1
Network 2
C10
CU
C10 Q 4.0
I 0.0 Z10
SC
C#100
I 0.2 C10
R
"0" count value
detector
preset value of 100 is loaded to counter C10.
If the signal state of input I0.1 changes from "0" to "1" (positive edge in RLO),
counter C10 count value will be decremented by one unless the value of C10 is
equal to "0". If there is no positive edge in RLO, the value of C10 will be
unchanged.
If the count value = 0, then Q4.0 is turned on.
If the signal state of input I0.2 is "1", the counter C10 is reset to "0".

4-14 A5E00706949-01

A5E00706949-01 5-1
5 Data Block Instructions
5.1 ---(OPN) Open Data Block: DB or DI
Symbol
<DB no.> or <DI no.>
---(OPN)
<DB no.>
<DI no.>
BLOCK_DB DB, DI Number of DB/DI; range
depends on CPU
Description
---(OPN) (Open a Data Block) opens a shared data block (DB) or an instance data
block (DI). The ---(OPN) function is an unconditional call of a data block. The
number of the data block is transferred into the DB or DI register. The subsequent
DB and DI commands access the corresponding blocks, depending on the register
contents.
Status word
writes: - - - - - - - - -
Example
Network 2
Network 1
OPN
DB10
Q 4.0
DBX0.0
Data block 10 (DB10) is opened. The contact address (DBX0.0) refers to bit zero of
data byte zero of the current data record contained in DB10. The signal state of this
bit is assigned to the output Q4.0.

Data Block Instructions
5-2 A5E00706949-01

A5E00706949-01 6-1
6 Logic Control Instructions
6.1 Overview of Logic Control Instructions
Description
You can use logic control instructions in all logic blocks: organization blocks (OBs),
function blocks (FBs), and functions (FCs).
There are logic control instructions to perform the following functions:
• ---( JMP )--- Unconditional Jump
• ---( JMP )--- Conditional Jump
• ---( JMPN )--- Jump-If-Not
Label as Address
The address of a Jump instruction is a label. A label consists of a maximum of four
characters. The first character must be a letter of the alphabet; the other characters
can be letters or numbers (for example, SEG3). The jump label indicates the
destination to which you want the program to jump.
Label as Destination
The destination label must be at the beginning of a network. You enter the
destination label at the beginning of the network by selecting LABEL from the
ladder logic browser. An empty box appears. In the box, you type the name of the
label.
SEG3
JMP
I 0.1 =
Q 4.0
I 0.4
Network 1
Network 2
Network X
SEG3
.
.
R
Q 4.1

Logic Control Instructions
6-2 A5E00706949-01
6.2 ---(JMP)--- Unconditional Jump
Symbol
<label name>
---( JMP )
Description
---( JMP ) (jump within the block when 1) functions as an absolute jump when there
is no other Ladder element between the left-hand power rail and the instruction
(see example).
A destination (LABEL) must also exist for every ---( JMP ).
All instructions between the jump instruction and the label are not executed.
Status word
writes: - - - - - - - - -
Example
JMP
CAS1
Network X
Network 1
Q 4.1
R
I 0.4
:
:
:
:
CAS1
The jump is always executed and the instructions between the jump instruction and
the jump label are missed out.

A5E00706949-01 6-3
6.3 ---(JMP)--- Conditional Jump
Symbol
<label name>
---( JMP )
Description
---( JMP ) (jump within the block when 1) functions as a conditional jump when the
RLO of the previous logic operation is "1".
A destination (LABEL) must also exist for every ---( JMP ).
If a conditional jump is not executed, the RLO changes to "1" after the jump
instruction.
Status word
writes: - - - - - 0 1 1 0
Example
I 0.0
Q 4.0
R
I 0.3
Network 2
Network 1
Network 3
I 0.4 Q 4.1
R
JMP
CAS1
CAS1
If I0.0 = "1", the jump to label CAS1 is executed. Because of the jump, the
instruction to reset output Q4.0 is not executed even if there is a logic "1" at I0.3.

6-4 A5E00706949-01
6.4 ---( JMPN ) Jump-If-Not
Symbol
<label name>
---( JMPN )
Description
---( JMPN ) (Jump-If-not) corresponds to a "goto label" function which is executed if
the RLO is "0".
A destination (LABEL) must also exist for every ---( JMPN ).
If a conditional jump is not executed, the RLO changes to "1" after the jump
instruction.
Status word
writes: - - - - - 0 1 1 0
Example
I 0.0
Q 4.0
R
I 0.3
Network 2
Network 1
Network 3
I 0.4 Q 4.1
R
JMP
CAS1
CAS1

A5E00706949-01 6-5
6.5 LABEL Label
Symbol
LABEL
Description
LABEL is the identifier for the destination of a jump instruction.
The first character must be a letter of the alphabet; the other characters can be
letters or numbers (for example, CAS1).
A jump label (LABEL) must exist for every ---( JMP ) or ---( JMPN ).
Example
I 0.0
Q 4.0
R
I 0.3
Network 2
Network 1
Network 3
I 0.4 Q 4.1
R
JMP
CAS1
CAS1

6-6 A5E00706949-01

A5E00706949-01 7-1
7 Integer Math Instructions
7.1 Overview of Integer Math Instructions
Description
Using integer math, you can carry out the following operations with two integer
numbers (16 and 32 bits):
• ADD_I Add Integer
• SUB_I Subtract Integer
• MUL_I Multiply Integer
• DIV_I Divide Integer
• ADD_DI Add Double Integer
• SUB_DI Subtract Double Integer
• MUL_DI Multiply Double Integer
• DIV_DI Divide Double Integer
• MOD_DI Return Fraction Double Integer

Integer Math Instructions
7-2 A5E00706949-01
7.2 Evaluating the Bits of the Status Word with Integer
Math Instructions
Description
The integer math instructions affect the following bits in the Status word: CC1 and
CC0, OV and OS.
The following tables show the signal state of the bits in the status word for the
results of instructions with Integers (16 and 32 bits):
Valid Range for the Result CC 1 CC 0 OV OS
0 (zero) 0 0 0 *
16 bits: -32 768 <= result < 0 (negative number)
32 bits: -2 147 483 648 <=result < 0 (negative number)
0 1 0 *
16 bits: 32 767 >= result > 0 (positive number)
32 bits: 2 147 483 647 >= result > 0 (positive number)
1 0 0 *
* The OS bit is not affected by the result of the instruction.
Invalid Range for the Result A1 A0 OV OS
Underflow (addition)
16 bits: result = -65536
32 bits: result = -4 294 967 296
0 0 1 1
Underflow (multiplication)
16 bits: result < -32 768 (negative number)
32 bits: result < -2 147 483 648 (negative number)
0 1 1 1
Overflow (addition, subtraction)
16 bits: result > 32 767 (positive number)
32 bits: result > 2 147 483 647 (positive number)
0 1 1 1
Overflow (multiplication, division)
16 bits: result > 32 767 (positive number)
32 bits: result > 2 147 483 647 (positive number)
1 0 1 1
Underflow (addition, subtraction)
16 bits: result < -32. 768 (negative number)
32 bits: result < -2 147 483 648 (negative number)
1 0 1 1
Division by 0 1 1 1 1
Operation A1 A0 OV OS
+D: result = -4 294 967 296 0 0 1 1
/D or MOD: division by 0 1 1 1 1

A5E00706949-01 7-3
7.3 ADD_I Add Integer
Symbol
ADD_I
EN
OUT
IN2
ENO
IN1
or constant
First value for addition
or constant
Second value for addition
OUT INT I, Q, M, L, D Result of addition
Description
ADD_I (Add Integer) is activated by a logic "1" at the Enable (EN) Input. IN1 and
IN2 are added and the result can be scanned at OUT. If the result is outside the
permissible range for an integer (16-bit), the OV bit and OS bit will be "1" and ENO
is logic "0", so that other functions after this math box which are connected by the
ENO (cascade arrangement) are not executed.
See also Evaluating the Bits of the Status Word with Integer Math Instructions.
Status word
Example
ADD_I
IN2
IN1
EN
MW0
Q 4.0
I 0.0
MW2
ENO
MW10
OUT
S
NOT
The ADD_I box is activated if I0.0 = "1". The result of the addition MW0 + MW2 is
output to MW10. If the result was outside the permissible range for an integer, the
output Q4.0 is set.

7-4 A5E00706949-01
7.4 SUB_I Subtract Integer
Symbol
SUB_I
EN
OUT
IN2
ENO
IN1
or constant
First value for subtraction
or constant
Value to subtract
OUT INT I, Q, M, L, D Result of subtraction
Description
SUB_I (Subtract Integer) is activated by a logic "1" at the Enable (EN) Input. IN2 is
subtracted from IN1 and the result can be scanned at OUT. If the result is outside
the permissible range for an integer (16-bit), the OV bit and OS bit will be "1" and
ENO is logic "0", so that other functions after this math box which are connected by
the ENO (cascade arrangement) are not executed.
Status word
Example
SUB_I
IN2
IN1
EN
MW0
Q 4.0
I 0.0
MW2
ENO
MW10
OUT
S
NOT
The SUB_I box is activated if I0.0 = "1". The result of the subtraction MW0 - MW2
is output to MW10. If the result was outside the permissible range for an integer or
the signal state of I0.0 = 0, the output Q4.0 is set.

A5E00706949-01 7-5
7.5 MUL_I Multiply Integer
Symbol
MUL_I
EN
OUT
IN2
ENO
IN1
or constant
First value for multiplication
or constant
Second value for multiplication
OUT INT I, Q, M, L, D Result of multiplication
Description
MUL_I (Multiply Integer) is activated by a logic "1" at the Enable (EN) Input. IN1
and IN2 are multiplied and the result can be scanned at OUT. If the result is
outside the permissible range for an integer (16-bit), the OV bit and OS bit will be
"1" and ENO is logic "0", so that other functions after this math box which are
connected by the ENO (cascade arrangement) are not executed.
Status word
Example
MUL_I
IN2
IN1
EN
MW0
Q 4.0
I 0.0
MW2
ENO
MW10
OUT
S
NOT
The MUL_I box is activated if I0.0 = "1". The result of the multiplication
MW0 x MW2 is output to MD10. If the result was outside the permissible range for
an integer, the output Q4.0 is set.

7-6 A5E00706949-01
7.6 DIV_I Divide Integer
Symbol
DIV_I
EN
OUT
IN2
ENO
IN1
or constant
Dividend
or constant
Divisor
OUT INT I, Q, M, L, D Result of division
Description
DIV_I (Divide Integer) is activated by a logic "1" at the Enable (EN) Input. IN1 is
divided by IN2 and the result can be scanned at OUT. If the result is outside the
permissible range for an integer (16-bit), the OV bit and OS bit is "1" and ENO is
logic "0", so that other functions after this math box which are connected by ENO
(cascade arrangement) are not executed.
Status word
Example
DIV_I
IN2
IN1
EN
MW0
Q 4.0
I 0.0
MW2
ENO
MW10
OUT
S
NOT
The DIV_I box is activated if I0.0 = "1". The result of the division MW0 by MW2 is
output to MW10. If the result was outside the permissible range for an integer, the
output Q4.0 is set.

A5E00706949-01 7-7
7.7 ADD_DI Add Double Integer
Symbol
ADD_DI
EN
OUT
IN2
ENO
IN1
or constant
or constant
OUT DINT I, Q, M, L, D Result of addition
Description
ADD_DI (Add Double Integer) is activated by a logic "1" at the Enable (EN) Input.
IN1 and IN2 are added and the result can be scanned at OUT. If the result is
outside the permissible range for a double integer (32-bit), the OV bit and OS bit
will be "1" and ENO is logic "0", so that other functions after this math box which
are connected by the ENO (cascade arrangement) are not executed.
Status word
Example
ADD_DI
IN2
IN1
EN
MD0
Q 4.0
I 0.0
MD4
ENO
MD10
OUT
S
NOT
The ADD_DI box is activated if I0.0 = "1". The result of the addition MD0 + MD4 is
output to MD10. If the result was outside the permissible range for a double
integer, the output Q4.0 is set.

7-8 A5E00706949-01
7.8 SUB_DI Subtract Double Integer
Symbol
SUB_DI
EN
OUT
IN2
ENO
IN1
or constant
or constant
Value to subtract
OUT DINT I, Q, M, L, D Result of subtraction
Description
SUB_DI (Subtract Double Integer) is activated by a logic "1" at the Enable (EN)
Input. IN2 is subtracted from IN1 and the result can be scanned at OUT. If the
result is outside the permissible range for a double integer (32-bit), the OV bit and
OS bit will be "1" and ENO is logic "0", so that other functions after this math box
which are connected by the ENO (cascade arrangement) are not executed.
Status word
Example
SUB_DI
IN2
IN1
EN
MD0
Q 4.0
I 0.0
MD4
ENO
MD10
OUT
S
NOT
The SUB_DI box is activated if I0.0 = "1". The result of the subtraction MD0 - MD4
is output to MD10. If the result was outside the permissible range for a double

A5E00706949-01 7-9
7.9 MUL_DI Multiply Double Integer
Symbol
MUL_DI
EN
OUT
IN2
ENO
IN1
or constant
or constant
OUT DINT I, Q, M, L, D Result of multiplication
Description
MUL_DI (Multiply Double Integer) is activated by a logic "1" at the Enable (EN)
Input. IN1 and IN2 are multiplied and the result can be scanned at OUT. If the
OS bit will be "1" and ENO is logic "0", so that other functions after this math box
Status word
Example
MUL_DI
IN2
IN1
EN
MD0
Q 4.0
I 0.0
MD4
ENO
MD10
OUT
S
NOT
The MUL_DI box is activated if I0.0 = "1". The result of the multiplication MD0 x
MD4 is output to MD10. If the result was outside the permissible range for a double

7-10 A5E00706949-01
7.10 DIV_DI Divide Double Integer
Symbol
DIV_DI
EN
OUT
IN2
ENO
IN1
or constant
Dividend
or constant
Divisor
OUT DINT I, Q, M, L, D Whole-number result of division
Description
DIV_DI (Divide Double Integer) is activated by a logic "1" at the Enable (EN) Input.
IN1 is divided by IN2 and the result can be scanned at OUT. The Divide Double
Integer element does not produce a remainder. If the result is outside the
permissible range for a double integer (32-bit), the OV bit and OS bit is "1" and
ENO is logic "0", so that other functions after this math box which are connected by
the ENO (cascade arrangement) are not executed.
Status word
Example
DIV_DI
IN2
IN1
EN
MD0
Q 4.0
I 0.0
MD4
ENO
MD10
OUT
S
NOT
The DIV_DI box is activated if I0.0 = "1". The result of the division MD0 : MD4 is
output to MD10. If the result was outside the permissible range for a double

A5E00706949-01 7-11
7.11 MOD_DI Return Fraction Double Integer
Symbol
MOD_DI
EN
OUT
IN2
ENO
IN1
or constant
Dividend
or constant
Divisor
OUT DINT I, Q, M, L, D Remainder of division
Description
MOD_DI (Return Fraction Double Integer) is activated by a logic "1" at the Enable
(EN) Input. IN1 is divided by IN2 and the fraction can be scanned at OUT. If the
OS bit is "1" and ENO is logic "0", so that other functions after this math box which
are connected by the ENO (cascade arrangement) are not executed.
Status word
Example
MOD_DI
IN2
IN1
EN
MD0
Q 4.0
I 0.0
MD4
ENO
MD10
OUT
S
NOT
The DIV_DI box is activated if I0.0 = "1". The remainder of the division MD0:MD4 is
output to MD10. If the remainder was outside the permissible range for a double

7-12 A5E00706949-01

A5E00706949-01 8-1
8 Floating Point Math Instructions
8.1 Overview of Floating-Point Math Instruction
Description
The IEEE 32-bit floating-point numbers belong to the data type called REAL. You
can use the floating-point math instructions to perform the following math
instructions using two 32-bit IEEE floating-point numbers:
• ADD_R Add Real
• SUB_R Subtract Real
• MUL_R Multiply Real
• DIV_R Divide Real
Using floating-point math, you can carry out the following operations with one 32-
bit IEEE floating-point number:
• Establish the Absolute Value (ABS)
• Establish the Square (SQR) and the Square Root (SQRT)
• Establish the Natural Logarithm (LN)
• Establish the Exponential Value (EXP) to base e (= 2,71828)
• Establish the following trigonometrical functions of an angle represented as a
32-bit IEEE floating-point number
- Sine (SIN) and Arc Sine (ASIN)
- Cosine (COS) and Arc Cosine (ACOS)
- Tangent (TAN) and Arc Tangent (ATAN)
See also Evaluating the Bits of the Status Word.

Floating Point Math Instructions
8-2 A5E00706949-01
8.2 Evaluating the Bits of the Status Word with Floating-
Point Math Instructions
Description
Floating–point instructions affect the following bits in the status word: CC 1 and
CC 0, OV and OS.
The following tables show the signal state of the bits in the status word for the
results of instructions with floating-point numbers (32 bits):
Valid Area for a Result CC 1 CC 0 OV OS
+0, -0 (zero) 0 0 0 *
-3.402823E+38 < result < -1.175494E-38 (negative number) 0 1 0 *
+1.175494E-38 < result < 3.402824E+38 (positive number) 1 0 0 *
* The OS bit is not affected by the result of the instruction.
Invalid Area for a Result CC 1 CC 0 OV OS
Underflow
-1.175494E-38 < result < - 1.401298E-45 (negative number)
0 0 1 1
Underflow
+1.401298E-45 < result < +1.175494E-38 (positive number)
0 0 1 1
Overflow
Result < -3.402823E+38 (negative number)
0 1 1 1
Overflow
Result > 3.402823E+38 (positive number)
1 0 1 1
Not a valid floating-point number or illegal instruction
(input value outside the valid range)
1 1 1 1

A5E00706949-01 8-3
8.3 Basic Instructions
8.3.1 ADD_R Add Real
Symbol
ADD_R
EN
OUT
IN2
ENO
IN1
or constant
or constant
OUT REAL I, Q, M, L, D Result of addition
Description
ADD_R (Add Real) is activated by a logic "1" at the Enable (EN) Input. IN1 and IN2
are added and the result can be scanned at OUT. If the result is outside the
permissible range for a floating-point number (overflow or underflow), the OV bit
and OS bit will be "1" and ENO is "0", so that other functions after this math box
Status word

8-4 A5E00706949-01
Example
ADD_R
EN
OUT
IN2
ENO
IN1
MD4
MD0
MD10
I 0.0
NOT S
Q 4.0
The ADD_R box is activated by logic "1" at I0.0. The result of the addition MD0 +
MD4 is output to MD10. If the result was outside the permissible range for a
floating-point number or if the program statement was not processed (I0.0 = 0), the
output Q4.0 is set.

A5E00706949-01 8-5
8.3.2 SUB_R Subtract Real
Symbol
SUB_R
EN
OUT
IN2
ENO
IN1
or constant
or constant
Value to subtract
OUT REAL I, Q, M, L, D Result of subtraction
Description
SUB_R (Subtract Real) is activated by a logic "1" at the Enable (EN) Input. IN2 is
subtracted from IN1 and the result can be scanned at OUT. If the result is outside
the permissible range for a floating-point number (overflow or underflow), the OV
bit and OS bit will be "1" and ENO is logic "0", so that other functions after this
math box which are connected by the ENO (cascade arrangement) are not
executed.
Status word
Example
SUB_R
EN
OUT
IN2
ENO
IN1
MD4
MD0
MD10
I 0.0
NOT S
Q 4.0
The SUB_R box is activated by logic "1" at I0.0. The result of the subtraction MD0 -
floating-point number or if the program statement was not processed, the output
Q4.0 is set.

8-6 A5E00706949-01
8.3.3 MUL_R Multiply Real
Symbol
MUL_R
EN
OUT
IN2
ENO
IN1
or constant
or constant
OUT REAL I, Q, M, L, D Result of multiplication
Description
MUL_R (Multiply Real) is activated by a logic "1" at the Enable (EN) Input. IN1 and
IN2 are multiplied and the result can be scanned at OUT. If the result is outside the
and OS bit will be "1" and ENO is logic "0", so that other functions after this math
box which are connected by the ENO (cascade arrangement) are not executed.
Status word
Example
MUL_R
EN
OUT
IN2
ENO
IN1
MD4
MD0
MD10
I 0.0
NOT S
Q 4.0
The MUL_R box is activated by logic "1" at I0.0. The result of the multiplication
MD0 x MD4 is output to MD0. If the result was outside the permissible range for a
Q4.0 is set.

A5E00706949-01 8-7
8.3.4 DIV_R Divide Real
Symbol
DIV_R
EN
OUT
IN2
ENO
IN1
or constant
Dividend
or constant
Divisor
OUT REAL I, Q, M, L, D Result of division
Description
DIV_R (Divide Real) is activated by a logic "1" at the Enable (EN) Input. IN1 is
divided by IN2 and the result can be scanned at OUT. If the result is outside the
and OS bit is "1" and ENO is logic "0", so that other functions after this math box
Status word
Example
DIV_R
EN
OUT
IN2
ENO
IN1
MD4
MD0
MD10
I 0.0
NOT S
Q 4.0
The DIV_R box is activated by logic "1" at I0.0. The result of the division MD0 by
Q4.0 is set.

8-8 A5E00706949-01
8.3.5 ABS Establish the Absolute Value of a Floating-Point Number
Symbol
ABS
EN
OUT
IN
ENO
IN REAL I, Q, M, L, D or
constant
Input value: floating-point
OUT REAL I, Q, M, L, D Output value: absolute value of
the floating-point number
Description
ABS establishes the absolute value of a floating-point number.
Status word
writes: 1 - - - - 0 1 1 1
Example
MD8
ABS
IN OUT MD12
I 0.0 Q 4.0
ENO
EN NOT
If I0.0 = "1", the absolute value of MD8 is output at MD12.
MD8 = + 6.234 gives MD12 = 6.234. Output Q4.0 is "1" when the conversion is not
executed (ENO = EN = 0).

A5E00706949-01 8-9
8.4 Extended Instructions
8.4.1 SQR Establish the Square
Symbol
SQR
EN
OUT
IN
ENO
IN REAL I, Q, M, L, D
or constant
OUT REAL I, Q, M, L, D Output value: square of floating-
point number
Description
SQR establishes the square of a floating-point number.
Status word

8-10 A5E00706949-01
8.4.2 SQRT Establish the Square Root
Symbol
SQRT
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: square root of
floating-point number
Description
SQRT establishes the square root of a floating-point number. This instruction
issues a positive result when the address is greater than "0". Sole exception: the
square root of -0 is -0.
Status word

A5E00706949-01 8-11
8.4.3 EXP Establish the Exponential Value
Symbol
EXP
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: exponential value
of the floating-point number
Description
EXP establishes the exponential value of a floating-point number on the basis e
(=2,71828...).
Status word

8-12 A5E00706949-01
8.4.4 LN Establish the Natural Logarithm
Symbol
LN
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: natural logarithm
of the floating-point number
Description
LN establishes the natural logarithm of a floating-point number.
Status word

A5E00706949-01 8-13
8.4.5 SIN Establish the Sine Value
Symbol
SIN
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: sine of the floating-
point number
Description
SIN establishes the sine value of a floating-point number. The floating-point
number represents an angle in a radian measure here.
Status word

8-14 A5E00706949-01
8.4.6 COS Establish the Cosine Value
Symbol
COS
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: cosine of the
Description
COS establishes the cosine value of a floating-point number. The floating-point
Status word

A5E00706949-01 8-15
8.4.7 TAN Establish the Tangent Value
Symbol
TAN
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: tangent of the
Description
TAN establishes the tangent value of a floating-point number. The floating-point
Status word

8-16 A5E00706949-01
8.4.8 ASIN Establish the Arc Sine Value
Symbol
ASIN
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: arc sine of the
Description
ASIN establishes the arc sine value of a floating-point number with a definition
range -1 <= input value <= 1. The result represents an angle in a radian measure
within the range
-π/2 ≤ output value ≤ +π/2
where π = 3.1415....
Status word

A5E00706949-01 8-17
8.4.9 ACOS Establish the Arc Cosine Value
Symbol
ACOS
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: arc cosine of the
Description
ACOS establishes the arc cosine value of a floating-point number with a definition
range -1 <= input value <= 1. The result represents an angle in a radian measure
within the range
0 ≤ output value ≤ +π
where π = 3.1415....
Status word

8-18 A5E00706949-01
8.4.10 ATAN Establish the Arc Tangent Value
Symbol
ATAN
EN
OUT
IN
ENO
or constant
OUT REAL I, Q, M, L, D Output value: arc tangent of the
Description
ATAN establishes the arc tangent value of a floating-point number. The result
represents an angle in a radian measure within the range
-π/2 ≤ output value ≤ +π/2
where π = 3.1415....
Status word

A5E00706949-01 9-1
9 Move Instructions
9.1 MOVE Assign a Value
Symbol
MOVE
IN
ENO
EN
OUT
IN All elementary data
types with a length of
8, 16, or 32 bits
I, Q, M, L, D or
constant
Source value
OUT All elementary data
types with a length of
8, 16, or 32 bits
I, Q, M, L, D Destination address
Description
MOVE (Assign a Value) is activated by the Enable EN Input. The value specified at
the IN input is copied to the address specified at the OUT output. ENO has the
same logic state as EN. MOVE can copy only BYTE, WORD, or DWORD data
objects. User-defined data types like arrays or structures have to be copied with
the system function "BLKMOVE" (SFC 20).
Status word
writes: 1 - - - - 0 1 1 1

Move Instructions
9-2 A5E00706949-01
MCR dependency is activated only if a Move box is placed inside an active MCR
zone. Within an activated MCR zone, if the MCR is on and there is power flow to
the enable input; the addressed data is copied as described above. If the MCR is
off, and a MOVE is executed, a logic "0" is written to the specified OUT address
regardless of current IN states.
Note
When moving a value to a data type of a different length, higher-value bytes are
truncated as necessary or filled up with zeros:
Example: Double Word 1111 1111 0000 1111 1111 0000 0101 0101
Move Result
to a double word: 1111 1111 0000 1111 1111 0000 0101 0101
to a byte: 0101 0101
to a word: 1111 0000 0101 0101
Example: Byte 1111 0000
Move Result
to a byte: 1111 0000
to a word: 0000 0000 1111 0000
to a double word: 0000 0000 0000 0000 0000 0000 1111 0000
Example
MOVE
IN
ENO
EN
OUT
Q 4.0
I 0.0
MW10 DBW12
The instruction is executed if I0.0 is "1". The content of MW10 is copied to data
word 12 of the currently open DB.
Q4.0 is "1" if the instruction is executed.
• When MCR is on, MW10 data is copied to DBW12 as described above.
• When MCR is off, "0" is written to DBW12.

A5E00706949-01 10-1
10 Program Control Instructions
10.1 Overview of Program Control Instructions
Description
The following program control instructions are available:
• ---(CALL) Call FC SFC from Coil (without Parameters)
• CALL_FB Call FB from Box
• CALL_FC Call FC from Box
• CALL_SFB Call System FB from Box
• CALL_SFC Call System FC from Box
• Call Multiple Instance
• Call Block from a Library
• Important Notes on Using MCR Functions
• ---(MCR<) Master Control Relay On
• ---(MCR>) Master Control Relay Off
• ---(MCRA) Master Control Relay Activate
• ---(MCRD) Master Control Relay Deactivate
• RET Return

Program Control Instructions
10-2 A5E00706949-01
10.2 ---(Call) Call FC SFC from Coil (without Parameters)
Symbol
<FC/SFC no.>
---( CALL )
<FC/SFC no.> BLOCK_FC
BLOCK_SFC
- Number of FC/SFC; range
depends on CPU
Description
---(Call) (Call FC or SFC without Parameters) is used to call a function (FC) or
system function (SFC) that has no passed parameters. A call is only executed if
RLO is "1" at the CALL coil. If ---(Call) is executed,
• The return address of the calling block is stored,
• The previous local data area is replaced by the current local data area,
• The MA bit (active MCR bit) is shifted to the B stack,
• A new local data area for the called function is created.
After this, program processing continues in the called FC or SFC.
Status word
BR CC
1
CC
0
OV OS OR STA RLO /FC
Unconditional: writes: - - - - 0 0 1 - 0
Conditional: writes: - - - - 0 0 1 1 0

A5E00706949-01 10-3
Example
MCRD
I 0.0
I 0.1
MCRA
CALL
Q 4.0
.
.
.
.
.
. FC10
.
.
.
.
.
.
CALL
FC11
OPN
DB10
.
.
.
The Ladder rungs shown above are program sections from a function block written
by a user. In this FB, DB10 is opened and MCR functionality is activated. If the
unconditional call of FC10 is executed, the following occurs:
The return address of the calling FB plus selection data for DB10 and for the
instance data block for the calling FB are saved. The MA bit, set to "1" in the
MCRA instruction, is pushed to the B stack and then set to "0" for the called block
(FC10). Program processing continues in FC10. If MCR functionality is required by
FC10, it must be re-activated within FC10. When FC10 is finished, program
processing returns to the calling FB. The MA bit is restored, DB10 and the instance
data block for the user-written FB become the current DBs again, regardless of
which DBs FC10 has used. The program continues with the next rung by assigning
the logic state of I0.0 to output Q4.0. The call of FC11 is a conditional call. It is only
executed if I0.1 is "1". If it is executed, the process of passing program control to
and returning from FC11 is the same as was described for FC10.
Note
After returning to the calling block, the previously open DB is not always open
again. Please make sure you read the note in the README file.

10-4 A5E00706949-01
10.3 CALL_FB Call FB from Box
Symbol
FB no.
ENO
EN
<DB no.>
The symbol depends on the FB (whether it has parameters and how many of
them). It must have the EN, ENO, and the name or number of the FB.
FB no.
DB no.
BLOCK_FB
BLOCK_DB
-
-
Number of FB/DB; range
depends on CPU
Description
CALL_FB (Call a Function Block from a Box) executed if EN is "1". If CALL_FB is
executed,
• The selection data for the two current data blocks (DB and instance DB) are
stored,
• A new local data area for the called function block is created.
After this, program processing continues within the called function block. The BR
bit is scanned in order to find out the ENO. The user has to assign the required
state (error evaluation) to the BR bit in the called block using ---(SAVE).
Status word
Unconditional: writes: x - - - 0 0 x x x
Conditional: writes: - - - - 0 0 x x x

A5E00706949-01 10-5
Example
MCRA
.
.
. Q 4.0
OPN
DB10
.
.
.
.
.
.
FB11
EN ENO
DB11
.
.
.
OPN
DB10
unconditional call of FB11 is executed, the following occurs:
(FB11). Program processing continues in FB11. If MCR functionality is required by
FB11, it must be re-activated within FB11. The state of the RLO must be saved in
the BR bit by the instruction ---(SAVE) in order to be able to evaluate errors in the
calling FB. When FB11 is finished, program processing returns to the calling FB.
The MA bit is restored and the instance data block of the user-written FB is opened
again. If the FB11 is processed correctly, ENO = "1" and therefore Q4.0 = "1".
Note
When opening an FB or SFB, the number of the previously opened DB is lost. The
required DB has to be reopened.

10-6 A5E00706949-01
10.4 CALL_FC Call FC from Box
Symbol
FC no.
ENO
EN
The symbol depends on the FC (whether it has parameters and how many of
them). It must have EN, ENO, and the name or number of the FC.
FC no. BLOCK_FC - Number of FC; range depends
on CPU
Description
CALL_FC (Call a Function from a Box) is used to call a function (FC). The call is
executed if EN is "1". If CALL_FC is executed,
• A new local data area for the called function is created.
After this, program processing continues in the called function.
The BR bit is scanned in order to find out the ENO. The user has to assign the
required state (error evaluation) to the BR bit in the called block using ---(SAVE).
If you call a function and the variable declaration table of the called block has IN,
OUT, and IN_OUT declarations, these variables are added in the program for the
calling block as a list of formal parameters.
When calling the function, you must assign actual parameters to the formal
parameters at the call location. Any initial values in the function declaration have no
significance.
Status word

A5E00706949-01 10-7
Example
MCRA
.
.
.
.
.
. Q 4.0
OPN
DB10
.
.
.
.
.
.
FC10
EN ENO
FC11
EN ENO
unconditional call of FC10 is executed, the following occurs:
(FC10). Program processing continues in FC10. If MCR functionality is required by
FC10, it must be re-activated within FC10. The state of the RLO must be saved in
the BR bit by the instruction ---(SAVE) in order to be able to evaluate errors in the
calling FB. When FC10 is finished, program processing returns to the calling FB.
The MA bit is restored. After execution of FC10, program processing is continued
in the calling FB depending on the ENO:
ENO = "1" FC11 is processed
ENO = "0" processing starts in the next network
If FC11 is also processed correctly, ENO = "1" and therefore Q4.0 = "1".
Note

10-8 A5E00706949-01
10.5 CALL_SFB Call System FB from Box
Symbol
SFB no.
ENO
EN
<DB no.>
The symbol depends on the SFB (whether it has parameters and how many of
them). It must have the EN, ENO, and the name or number of the SFB.
SFB no.
DB no.
BLOCK_SFB
BLOCK_DB
-
-
Number of SFB; range depends
on CPU
Description
CALL_SFB (Call a System Function Block from a Box) is executed if EN is "1". If
CALL_SFB is executed,
• The selection data for the two current data blocks (DB and instance DB) are
stored,
• A new local data area for the called system function block is created.
Program processing then continues in the called SFB. ENO is "1" if the SFB was
called (EN = "1") and no error occurs.
Status word

A5E00706949-01 10-9
Example
MCRA
.
.
.
.
.
. Q 4.0
OPN
DB10
.
.
.
SFB 8
EN ENO
REQ DONE
ID ERROR
R_ID STATUS
SD_1
SD_2
SD_3
SD_4
M11.0 READY
M10.0
DB 8
CODE
DW12
DW14
DW16
OPN
DB10
unconditional call of SFB8 is executed, the following occurs:
(SFB8). Program processing continues in SFB8. When SFB8 is finished, program
processing returns to the calling FB. The MA bit is restored and the instance data
block of the user-written FB becomes the current instance DB. If the SFB8 is
processed correctly, ENO = "1" and therefore Q4.0 = "1".
Note
When opening an FB or SFB, the number of the previously opened DB is lost. The
required DB has to be reopened.

10-10 A5E00706949-01
10.6 CALL_SFC Call System FC from Box
Symbol
SFC no.
ENO
EN
The symbol depends on the SFC (whether it has parameters and how many of
them). It must have EN, ENO, and the name or number of the SFC.
EN BOOL - Enable input
ENO BOOL - Enable output
SFC no. BLOCK_SFC - Number of SFC; range depends
on CPU
Description
CALL_SFC (Call a System Function from a Box) is used to call an SFC. The call is
executed if EN is "1". If CALL_SFC is executed,
• A new local data area for the called system function is created.
After this, program processing continues in the called SFC. ENO is "1" if the SFC
was called (EN = "1") and no error occurs.
Status word

A5E00706949-01 10-11
Example
MCRA
.
.
.
.
.
. Q 4.0
OPN
DB10
.
.
.
.
.
.
SFC20
EN ENO
SRCBLK RET_VAL
DSTBLK
DBDW12 MW10
MOTOR.SPEED
unconditional call of SFC20 is executed, the following occurs:
(SFC20). Program processing continues in SFC20. When SFC20 is finished,
program processing returns to the calling FB. The MA bit is restored.
After processing the SFC20, the program is continued in the calling FB depending
on the ENO:
ENO = "1" Q4.0 = "1"
ENO = "0" Q4.0 = "0"
Note

10-12 A5E00706949-01
10.7 Call Multiple Instance
Symbol
#Variable
name
ENO
EN
#Variable name FB, SFB - Name of multiple instance
Description
A multiple instance is created by declaring a static variable with the data type of a
function block. Only multiple instances that have already been declared are
included in the program element catalog. The symbol for a multiple instance varies
depending on whether and how many parameters are present. EN, ENO and the
variable name are always present.
Status word
writes: - - - - 0 0 x x x

A5E00706949-01 10-13
10.8 Call Block from a Library
The libraries available in the SIMATIC Manager can be used here to select a block
that
• Is integrated in your CPU operating system ("Standard Library" library for
STEP 7 projects in version 3 and "stdlibs (V2)" for STEP 7 projects in version 2)
• You saved yourself in a library because you wanted to use it a number of times.
10.9 Important Notes on Using MCR Functions
!
Take care with blocks in which the Master Control Relay was activated with
MCRA:
• If the MCR is deactivated, the value 0 is written by all assignments in program
segments between ---(MCR<) and ---(MCR>). This is valid for all boxes which contain
an assignment, including the parameter transfer to blocks.
• The MCR is deactivated if the RLO was = 0 before an MCR< instruction.
! Danger: PLC in STOP or undefined runtime characteristics!
The compiler also uses write access to local data behind the temporary variables
defined in VAR_TEMP for calculating addresses. This means the following
command sequences will set the PLC to STOP or lead to undefined runtime
characteristics:
Formal parameter access
• Access to components of complex FC parameters of the type STRUCT, UDT,
ARRAY, STRING
• Access to components of complex FB parameters of the type STRUCT, UDT,
ARRAY, STRING from the IN_OUT area in a block with multiple instance capability
(version 2 block).
• Access to parameters of a function block with multiple instance capability (version 2
block) if its address is greater than 8180.0.
• Access in a function block with multiple instance capability (version 2 block) to a
parameter of the type BLOCK_DB opens DB0. Any subsequent data access sets the
CPU to STOP. T 0, C 0, FC0, or FB0 are also always used for TIMER, COUNTER,
BLOCK_FC, and BLOCK_FB.
Parameter passing
• Calls in which parameters are transferred.
LAD/FBD
• T branches and midline outputs in Ladder or FBD starting with RLO = 0.
Remedy
Free the above commands from their dependence on the MCR:
• Deactivate the Master Control Relay using the Master Control Relay Deactivate
instruction before the statement or network in question.
• Activate the Master Control Relay again using the Master Control Relay Activate
instruction after the statement or network in question.

10-14 A5E00706949-01
10.10 ---(MCR<) Master Control Relay On
Important Notes on Using MCR Functions
Symbol
---(MCR<)
Description
---(MCR<) (Open a Master Control Relay zone) saves the RLO in the MCR stack.
The MCR nesting stack is a LIFO stack (last in, first out) and only 8 stack entries
(nesting levels) are possible. If the stack is already full, the ---(MCR<) function
produces an MCR stack fault (MCRF). The following elements are MCR-dependent
and influenced by the RLO state that is saved to the MCR stack while opening an
MCR zone:
• --( # ) Midline Output
• --( ) Output
• --( S ) Set Output
• --( R ) Reset Output
• RS Reset Flip Flop
• SR Set Flip Flop
• MOVE Assign a Value
Status word
writes: - - - - - 0 1 - 0

A5E00706949-01 10-15
Example
MCR>
I 0.0
I 0.3
Q 4.1
I 0.4
I 0.1
MCR zone 1
MCR zone 2
MCRA
MCR<
MCR<
Network 8
Network 7
Network 6
Network 5
Network 4
Network 3
Network 2
Network 1
Q 4.0
S
MCR>
MCRD
MCR functionality is activated by the MCRA rung. It is then possible to create up to
eight nested MCR zones. In the example there are two MCR zones. The functions
are executed as follows:
I0.0 = "1" (MCR is ON for zone 1): the logic state of I0.4 is assigned to Q4.1
I0.0 = "0" (MCR is OFF for zone 1): Q4.1 is "0" regardless of the logic state of I0.4
I0.1 = "1" (MCR is ON for zone 2): Q4.0 is set to "1" if I0.3 is "1"
I0.1 = "0" (MCR is OFF for zone 2): Q4.0 remains unchanged regardless the logic
state of I0.3

10-16 A5E00706949-01
10.11 ---(MCR>) Master Control Relay Off
Symbol
---(MCR>)
Description
---(MCR>) (close the last opened MCR zone) removes an RLO entry from the MCR
stack. The MCR nesting stack is a LIFO stack (last in, first out) and only 8 stack
entries (nesting levels) are possible. If the stack is already empty, ---(MCR>)
produces an MCR stack fault (MCRF). The following elements are MCR-dependent
and influenced by the RLO state that is saved to the MCR stack while opening the
MCR zone:
• --( # ) Midline Output
• --( ) Output
• --( S ) Set Output
• --( R ) Reset Output
• RS Reset Flip Flop
• SR Set Flip Flop
• MOVE Assign a Value
Status word
writes: - - - - - 0 1 - 0

A5E00706949-01 10-17
Example
MCR>
I 0.0
I 0.3
Q 4.1
I 0.4
I 0.1
MCR zone 1
MCR zone 2
MCRA
MCR<
MCR<
Network 8
Network 7
Network 6
Network 5
Network 4
Network 3
Network 2
Network 1
Q 4.0
S
MCR>
MCRD
MCR functionality is activated by the ---(MCRA) rung. It is then possible to create
up to eight nested MCR zones. In the example there are two MCR zones. The first
---(MCR>) (MCR OFF) rung belongs to the second ---(MCR<) (MCR ON) rung. All
rungs between belong to the MCR zone 2. The functions are executed as follows:
I0.0 = "1": the logic state of I0.4 is assigned to Q4.1
I0.0 = "0": Q4.1 is "0" regardless of the logic state of I0.4
I0.1 = "1": Q4.0 is set to "1" if I0.3 is "1"
I0.1 = "0": Q4.0 remains unchanged regardless of the logic state of I0.3

10-18 A5E00706949-01
10.12 ---(MCRA) Master Control Relay Activate
Symbol
---(MCRA)
Description
---(MCRA) (Activate Master Control Relay) activates master control relay function.
After this command, it is possible to program MCR zones with the commands:
• ---(MCR<)
• ---(MCR>)
Status word
writes: - - - - - - - - -
Example
.
.
.
I 0.0
Q 4.1
I 0.4
I 0.3
MCRA
MCR<
Network n + 1
Network n
Network 3
Network 2
Network 1
Q 4.0
S
MCR>
MCRD
MCR functionality is activated by the MCRA rung. The rungs between the MCR<
and the MCR> (outputs Q4.0, Q4.1) are executed as follows:
I0.0 = "1" ( MCR is ON ): Q4.0 is set to "1" if I0.3 is logic "1", or will remain
unchanged if I0.3 is "0" and the logic state of I0.4 is assigned to Q4.1
I0.0 = "0" ( MCR is OFF): Q4.0 remains unchanged regardless of the logic state of
I0.3 and Q4.1 is "0" regardless of the logic state of I0.4
In the next rung, the instruction ---(MCRD) deactivates the MCR. This means that
you cannot program any more MCR zones using the instruction pair ---(MCR<) and
---(MCR>).

A5E00706949-01 10-19
10.13 ---(MCRD) Master Control Relay Deactivate
Symbol
---(MCRD)
Description
---(MCRD) (Deactivate Master Control Relay) deactivates MCR functionality. After
this command, you cannot program MCR zones.
Status word
writes: - - - - - - - - -
Example
.
.
.
I 0.0
Q 4.1
I 0.4
I 0.3
MCRA
MCR<
Network n + 1
Network n
Network 3
Network 2
Network 1
Q 4.0
S
MCR>
MCRD
MCR functionality is activated by the MCRA rung. The rungs between the MCR<
and the MCR> (outputs Q4.0, Q4.1) are executed as follows:
I0.0 = "1" (MCR is ON): Q4.0 is set to "1" if I0.3 is logic "1" and the logic state of
I0.4 is assigned to Q4.1.
I0.0 = "0" (MCR is OFF): Q4.0 remains unchanged regardless of the logic state of
I0.3 and Q4.1 is "0" regardless of the logic state of I0.4.
In the next rung, the instruction ---(MCRD) deactivates the MCR. This means that
you cannot program any more MCR zones using the instruction pair ---(MCR<) and
---(MCR>).

10-20 A5E00706949-01
10.14 ---(RET) Return
Symbol
---( RET )
Description
RET (Return) is used to conditionally exit blocks. For this output, a preceding logic
operation is required.
Status word
Conditional Return (Return if RLO = "1"):
writes: * - - - 0 0 1 1 0
* The operation RET is shown internally in the sequence "SAVE; BEC, ". This also
affects the BR bit.
Example
I 0.0
RET
.
.
.
.
.
.
The block is exited if I0.0 is "1".

A5E00706949-01 11-1
11 Shift and Rotate Instructions
11.1 Shift Instructions
11.1.1 Overview of Shift Instructions
Description
You can use the Shift instructions to move the contents of input IN bit by bit to the
left or the right (see also CPU Registers). Shifting to the left multiplies the contents
of input IN by 2 to the power n (2 n ); shifting to the right divides the contents of
input IN by 2 to the power n (2 n ). For example, if you shift the binary equivalent of
the decimal value 3 to the left by 3 bits, you obtain the binary equivalent of the
decimal value 24 in the accumulator. If you shift the binary equivalent of the
decimal value 16 to the right by 2 bits, you obtain the binary equivalent of the
decimal value 4 in the accumulator.
The number that you supply for input parameter N indicates the number of bits by
which to shift. The bit places that are vacated by the Shift instruction are either
filled with zeros or with the signal state of the sign bit (a 0 stands for positive and a
1 stands for negative). The signal state of the bit that is shifted last is loaded into
the CC 1 bit of the status word. The CC 0 and OV bits of the status word are reset
to 0. You can use jump instructions to evaluate the CC 1 bit.
The following shift instructions are available:
• SHR_I Shift Right Integer
• SHR_DI Shift Right Double Integer
• SHL_W Shift Left Word
• SHR_W Shift Right Word
• SHL_DW Shift Left Double Word
• SHR_DW Shift Right Double Word

Shift and Rotate Instructions
11-2 A5E00706949-01
11.1.2 SHR_I Shift Right Integer
Symbol
SHR_I
EN
OUT
N
ENO
IN
IN INT I, Q, M, L, D Value to shift
N WORD I, Q, M, L, D Number of bit positions to shift
OUT INT I, Q, M, L, D Result of shift instruction
Description
SHR_I (Shift Right Integer) is activated by a logic "1" at the Enable (EN) Input. The
SHR_I instruction is used to shift bits 0 to 15 of input IN bit by bit to the right. Bits
16 to 31 are not affected. The input N specifies the number of bits by which to shift.
If N is larger than 16, the command acts as if N were equal to 16. The bit positions
shifted in from the left to fill vacated bit positions are assigned the logic state of bit
15 (sign bit for the integer). This means these bit positions are assigned "0" if the
integer is positive and "1" if the integer is negative. The result of the shift instruction
can be scanned at output OUT. The CC 0 bit and the OV bit are set to "0" by
SHR_I if N is not equal to 0.
ENO has the same signal state as EN.
1 0 1 0
IN
15... ...8 7... ...0
4 places
N
OUT
The vacated places are
filled with the signal state
of the sign bit.
These four bits
are lost.
1 1 1 1 0 0 0 0 1 0 1 0
1 1 1 1 1 0 1 0 1 1 1 1 0 0 0 0 1 0 1 0
Sign bit

A5E00706949-01 11-3
Status word
writes: x x x x - x x x 1
Example
SHR_I
N
IN
EN
MW0 MW4
Q 4.0
I 0.0
MW2
ENO
OUT
S
The SHR_I box is activated by logic "1" at I0.0. MW0 is loaded and shifted right by
the number of bits specified with MW2. The result is written to MW4. Q4.0 is set.

11-4 A5E00706949-01
11.1.3 SHR_DI Shift Right Double Integer
Symbol
SHR_DI
EN
OUT
N
ENO
IN
IN DINT I, Q, M, L, D Value to shift
OUT DINT I, Q, M, L, D Result of shift instruction
Description
SHR_DI (Shift Right Double Integer) is activated by a logic "1" at the Enable (EN)
Input. The SHR_DI instruction is used to shift bits 0 to 31 of input IN bit by bit to the
right. The input N specifies the number of bits by which to shift. If N is larger than
32, the command acts as if N were equal to 32. The bit positions shifted in from the
left to fill vacated bit positions are assigned the logic state of bit 31 (sign bit for the
double integer). This means these bit positions are assigned "0" if the integer is
positive and "1" if the integer is negative. The result of the shift instruction can be
scanned at output OUT. The CC 0 bit and the OV bit are set to "0" by SHR_DI if N
is not equal to 0.
Status word
Example
SHR_DI
N
IN
EN
MD0 MD10
Q 4.0
I 0.0
MW4
ENO
OUT
S
The SHR_DI box is activated by logic "1" at I0.0. MD0 is loaded and shifted right by
the number of bits specified with MW4. The result is written to MD10. Q4.0 is set.

A5E00706949-01 11-5
11.1.4 SHL_W Shift Left Word
Symbol
SHL_W
EN
OUT
N
ENO
IN
IN WORD I, Q, M, L, D Value to shift
OUT WORD I, Q, M, L, D Result of shift instruction
Description
SHL_W (Shift Left Word) is activated by a logic "1" at the Enable (EN) Input. The
SHL_W instruction is used to shift bits 0 to 15 of input IN bit by bit to the left. Bits
If N is larger than 16, the command writes a "0" at output OUT and sets the bits
CC 0 and OV in the status word to "0". N zeros are also shifted in from the right to
fill vacated bit positions. The result of the shift instruction can be scanned at output
OUT. The CC 0 bit and the OV bit are set to "0" by SHL_W if N is not equal to 0.
IN
6 places
N
OUT
The vacated places
are filled with zeros.
These six bits
are lost.
0 0 0 0
15... ...8 7... ...0
1 1 1 1 0 1 0 1 0 1 0 1
0 1 0 1
0 0 0 0 1 1 0 1 0 0 0 0 0 0
1 1 0 1
Status word

11-6 A5E00706949-01
Example
SHL_W
N
IN
EN
MW0 MW4
Q 4.0
I 0.0
MW2
ENO
OUT
S
The SHL_W box is activated by logic "1" at I0.0. MW0 is loaded and shifted left by
the number of bits specified with MW2. The result is written to MW4. Q4.0 is set.

A5E00706949-01 11-7
11.1.5 SHR_W Shift Right Word
Symbol
SHR_W
EN
OUT
N
ENO
IN
IN WORD I, Q, M, L, D Value to shift
OUT WORD I, Q, M, L, D Result word of shift instruction
Description
SHR_W (Shift Right Word) is activated by a logic "1" at the Enable (EN) Input. The
SHR_W instruction is used to shift bits 0 to 15 of input IN bit by bit to the right. Bits
If N is larger than 16, the command writes a "0" at output OUT and sets the bits
CC 0 and OV in the status word to "0". N zeros are also shifted in from the left to
fill vacated bit positions. The result of the shift instruction can be scanned at output
OUT. The CC 0 bit and the OV bit are set to "0" by SHR_W if N is not equal to 0.
Status word
Example
SHR_W
N
IN
EN
MW0 MW4
Q 4.0
I 0.0
MW2
ENO
OUT
S
The SHR_W box is activated by logic "1" at I0.0. MW0 is loaded and shifted right
by the number of bits specified with MW2. The result is written to MW4. Q4.0 is set.

11-8 A5E00706949-01
11.1.6 SHL_DW Shift Left Double Word
Symbol
SHL_DW
EN
OUT
N
ENO
IN
IN DWORD I, Q, M, L, D Value to shift
OUT DWORD I, Q, M, L, D Result double word of shift
instruction
Description
SHL_DW (Shift Left Double Word) is activated by a logic "1" at the Enable (EN)
Input. The SHL_DW instruction is used to shift bits 0 to 31 of input IN bit by bit to
the left. The input N specifies the number of bits by which to shift. If N is larger than
32, the command writes a "0" at output OUT and sets the bits CC 0 and OV in the
status word to "0". N zeros are also shifted in from the right to fill vacated bit
positions. The result double word of the shift instruction can be scanned at output
OUT. The CC 0 bit and the OV bit are set to "0" by SHL_DW if N is not equal to 0.
Status word
Example
SHL_DW
N
IN
EN
MD0 MD10
Q 4.0
I 0.0
MW4
ENO
OUT
S
The SHL_DW box is activated by logic "1" at I0.0. MD0 is loaded and shifted left by
the number of bits specified with MW4. The result is written to MD10. Q4.0 is set.

A5E00706949-01 11-9
11.1.7 SHR_DW Shift Right Double Word
Symbol
SHR_DW
EN
OUT
N
ENO
IN
IN DWORD I, Q, M, L, D Value to shift
OUT DWORD I, Q, M, L, D Result double word of shift
instruction
Description
SHR_DW (Shift Right Double Word) is activated by a logic "1" at the Enable (EN)
Input. The SHR_DW instruction is used to shift bits 0 to 31 of input IN bit by bit to
the right. The input N specifies the number of bits by which to shift. If N is larger
than 32, the command writes a "0" at output OUT and sets the bits CC 0 and OV
in the status word to "0". N zeros are also shifted in from the left to fill vacated bit
positions. The result double word of the shift instruction can be scanned at output
OUT. The CC 0 bit and the OV bit are set to "0" by SHR_DW if N is not equal to 0.
1 1 1 1 1 1 1 1 0 1 0 1 1 1 1 1
1 1 1 1
1 0 1 0
1 0 1 0
0 1 0 1
1 1 1 1 1 1 1 0 1 0 1 0 1 1 1
1 1 1 1
0 1 0 1
0 1 0 1
1 0 1 1
IN
31... ...16 15... ...0
3 places
N
OUT 0 0 0 1
The vacated places
are filled with zeros.
These three
bits are lost.
Status word

11-10 A5E00706949-01
Example
SHR_DW
N
IN
EN
MD0 MD10
Q 4.0
I 0.0
MW4
ENO
OUT
S
The SHR_DW box is activated by logic "1" at I0.0. MD0 is loaded and shifted right
by the number of bits specified with MW4. The result is written to MD10. Q4.0 is
set.

A5E00706949-01 11-11
11.2 Rotate Instructions
11.2.1 Overview of Rotate Instructions
Description
You can use the Rotate instructions to rotate the entire contents of input IN bit by
bit to the left or to the right. The vacated bit places are filled with the signal states
of the bits that are shifted out of input IN.
The number that you supply for input parameter N specifies the number of bits by
which to rotate.
Depending on the instruction, rotation takes place via the CC 1 bit of the status
word. The CC 0 bit of the status word is reset to 0.
The following rotate instructions are available:
• ROL_DW Rotate Left Double Word
• ROR_DW Rotate Right Double Word
11.2.2 ROL_DW Rotate Left Double Word
Symbol
ROL_DW
EN
OUT
N
ENO
IN
IN DWORD I, Q, M, L, D Value to rotate
N WORD I, Q, M, L, D Number of bit positions to rotate
OUT DWORD I, Q, M, L, D Result double word of rotate
instruction

11-12 A5E00706949-01
Description
ROL_DW (Rotate Left Double Word) is activated by a logic "1" at the Enable (EN)
Input. The ROL_DW instruction is used to rotate the entire contents of input IN bit
by bit to the left. The input N specifies the number of bits by which to rotate. If N is
larger than 32, the double word IN is rotated by ((N-1) modulo 32)+1 positions. The
bit positions shifted in from the right are assigned the logic states of the bits which
were rotated out to the left. The result double word of the rotate instruction can be
scanned at output OUT. The CC 0 bit and the OV bit are set to "0" by ROL_DW if
N is not equal to 0.
IN 1 1 1 1 0 0 0 0 1 0 1 0 1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 0
1 0 1 0
31... ...16 15... ...0
3 places
N
OUT 1 1 1 0 1 0 1 0 1 0 1 0 0 0 0 1 1 1 1
0 1 1 1
1 0 0 0
0 1 1 1
1 0 0 0
The signal states of the three
bits that are shifted out are
inserted in the vacated places.
These three
bits are lost.
Status word
Example
ROL_DW
N
IN
EN
MD0 MD10
Q 4.0
I 0.0
MW4
ENO
OUT
S
The ROL_DW box is activated by logic "1" at I0.0. MD0 is loaded and rotated to the
left by the number of bits specified with MW4. The result is written to MD10. Q4.0 is
set.

A5E00706949-01 11-13
11.2.3 ROR_DW Rotate Right Double Word
Symbol
ROR_DW
EN
OUT
N
ENO
IN
IN DWORD I, Q, M, L, D Value to rotate
N WORD I, Q, M, L, D Number of bit positions to rotate
OUT DWORD I, Q, M, L, D Result double word of rotate
instruction
Description
ROR_DW (Rotate Right Double Word) is activated by a logic "1" at the Enable
(EN) Input. The ROR_DW instruction is used to rotate the entire contents of input
IN bit by bit to the right. The input N specifies the number of bits by which to rotate.
If N is larger than 32, the double word IN is rotated by ((N-1) modulo 32)+1
positions. The bit positions shifted in from the left are assigned the logic states of
the bits which were rotated out to the right. The result double word of the rotate
instruction can be scanned at output OUT. The CC 0 bit and the OV bit are set to
"0" by ROR_DW if N is not equal to 0.
1 0 1 0 1 0 1 0 0 0 0 0 0 1 0 1
0 1 0 1
1 1 1 1
0 0 0 0
1 1 1 1
0 1 0 1 0 1 0 0 0 0 0 1 1 0 1
1 0 1 0
1 1 1 0
0 0 0 1
1 1 1 0
IN
31... ...16 15... ...0
3 places
N
OUT 1 0 1 1
The signal states of the three
bits that are shifted out are
inserted in the vacated places.

11-14 A5E00706949-01
Status word
Example
ROR_DW
N
IN
EN
MD0 MD10
Q 4.0
I 0.0
MW4
ENO
OUT
S
The ROR_DW box is activated by logic "1" at I0.0. MD0 is loaded and rotated to
the right by the number of bits specified with MW4. The result is written to MD10.
Q4.0 is set.

A5E00706949-01 12-1
12 Status Bit Instructions
12.1 Overview of Statusbit Instructions
Description
The status bit instructions are bit logic instructions that work with the bits of the
status word. Each of these instructions reacts to one of the following conditions that
is indicated by one or more bits of the status word:
• The Binary Result bit (BR ---I I---) is set (that is, has a signal state of 1).
• A math function had an Overflow (OV ---I I---) or a Stored Overflow
(OS ---I I---).
• The result of a math function is unordered (UO ---I I---).
• The result of a math function is related to 0 in one of the following ways:
== 0, <> 0, > 0, < 0, >= 0, <= 0.
When a status bit instruction is connected in series, it combines the result of its
signal state check with the previous result of logic operation according to the And
truth table. When a status bit instruction is connected in parallel, it combines its
result with the previous RLO according to the Or truth table.
Status word
The status word is a register in the memory of your CPU that contains bits that you
can reference in the address of bit and word logic instructions. Structure of the
status word:
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
...2
9
2
15
...
You can evaluate the bits in the status word
• by Integer Math Functions,
• by Floating-point Functions.

Status Bit Instructions
12-2 A5E00706949-01
12.2 OV ---| |--- Exception Bit Overflow
Symbol
or negation /
OV OV
Description
OV ---| |--- (Exception Bit Overflow) or OV ---| / |--- ( Negated Exception Bit
Overflow) contact symbols are used to recognize an overflow in the last math
function executed. This means that after the function executes, the result of the
instruction is outside the permissible negative or positive range. Used in series, the
result of the scan is linked to the RLO by AND, used in parallel, it is linked to the
RLO by OR.
Status word
writes: - - - - - x x x 1
Example
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0
OV
S
Q 4.0
Network 1
Network 2
I 0.1 I 0.2
I 0.2
The box is activated by signal state "1" at I0.0. If the result of the math function
"IW0 - IW2" is outside the permissible range for an integer, the OV bit is set.
The signal state scan at OV is "1". Q4.0 is set if the scan of OV is signal state "1"
and the RLO of network 2 is "1".
Note
The scan with OV is only necessary because of the two separate networks.
Otherwise it is possible to take the ENO output of the math function that is "0" if the
result is outside the permissible range.

A5E00706949-01 12-3
12.3 OS ---| |--- Exception Bit Overflow Stored
Symbol
or negation /
OS OS
Description
OS ---| |--- (Exception Bit Overflow Stored) or OS ---| / |--- (Negated Exception Bit
Overflow Stored) contact symbols are used to recognize and store a latching
overflow in a math function. If the result of the instruction lies outside the
permissible negative or positive range, the OS bit in the status word is set. Unlike
the OV bit, which is rewritten for subsequent math functions, the OS bit stores an
overflow when it occurs. The OS bit remains set until the block is left.
Used in series, the result of the scan is linked to the RLO by AND, used in parallel,
it is linked to the RLO by OR.
Status word
writes: - - - - - x x x 1
Example
OS
S
Q 4.0
Network 1
Network 2
Network 3
ADD_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW12
I 0.01
MUL_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0

12-4 A5E00706949-01
The MUL_I box is activated by signal state "1" at I0.0. The ADD_I box is activated
by logic "1" at I0.1. If the result of one of the math functions was outside the
permissible range for an integer, the OS bit in the status word is set to "1". Q4.0 is
set if the scan of OS is logic "1".
Note
The scan with OS is only necessary because of the two separate networks.
Otherwise it is possible to take the ENO output of the first math function and
connect it with the EN input of the second (cascade arrangement).

A5E00706949-01 12-5
12.4 UO ---| |--- Exception Bit Unordered
Symbol
or negation /
UO UO
Description
UO ---| |--- (Exception Bit Unordered) or UO ---| / |--- (Negated Exception Bit
Unordered) contact symbols are used to recognize if the math function with
floating-point numbers is unordered (meaning, whether one of the values in the
math function is an invalid floating-point number).
If the result of a math function with floating-point numbers (UO) is invalid, the signal
state scan is "1". If the logic operation in CC 1 and CC 0 shows "not invalid", the
result of the signal state scan is "0".
Used in series, the result of the scan is linked to the RLO by AND, used in parallel
Status word
writes: - - - - - x x x 1
Example
UO
S
Q 4.1
DIV_R
EN
OUT
IN2
ENO
IN1
ID4
ID0
MD10
I 0.0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of ID0 or ID4 is an
invalid floating-point number, the math function is invalid. If the signal state of EN =
1 (activated) and if an error occurs during the processing of the function DIV_R, the
signal state of ENO = 0.
Output Q4.1 is set when the function DIV_R is executed but one of the values is
not a valid floating-point number.

12-6 A5E00706949-01
12.5 BR ---| |--- Exception Bit Binary Result
Symbol
or negation /
BR BR
Description
BR ---| |--- (Exception Bit BR Memory) or BR ---| / |--- (Negated Exception Bit BR
Memory) contact symbols are used to test the logic state of the BR bit in the status
word. Used in series, the result of the scan is linked to the RLO by AND, used in
parallel, it is linked to the RLO by OR. The BR bit is used in the transition from
word to bit processing.
Status word
writes: - - - - - x x x 1
Example
I 0.0 BR
I 0.2
S
Q 4.0
Q4.0 is set if I0.0 is "1" or I0.2 is "0" and in addition to this RLO the logic state of
the BR bit is "1".

A5E00706949-01 12-7
12.6 ==0 ---| |--- Result Bit Equal 0
Symbol
or negation /
==0 ==0
Description
==0 ---| |--- (Result Bit Equal 0) or ==0 ---| / |--- (Negated Result Bit Equal 0)
contact symbols are used to recognize if the result of a math function is equal to
"0". The instructions scan the condition code bits CC 1 and CC 0 in the status
word in order to determine the relation of the result to "0". Used in series, the result
of the scan is linked to the RLO by AND, used in parallel, it is linked to the RLO by
OR.
Status word
writes: - - - - - x x x 1
Examples
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 ==0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is equal to the
value of IW2, the result of the math function "IW0 - IW2" is "0". Q4.0 is set if the
function is properly executed and the result is equal to "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 ==0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not equal to "0".

12-8 A5E00706949-01
12.7 <>0 ---| |--- Result Bit Not Equal 0
Symbol
or negation /
<>0 <>0
Description
<>0 ---| |--- (Result Bit Not Equal 0) or <>0 ---| / |--- (Negated Result Bit Not Equal
0) contact symbols are used to recognize if the result of a math function is not
equal to "0". The instructions scan the condition code bits CC 1 and CC 0 in the
status word in order to determine the relation of the result to "0". Used in series, the
RLO by OR.
Status word
writes: - - - - - x x x 1
Examples
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <>0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is different to the
value of IW2, the result of the math function "IW0 - IW2" is not equal to "0". Q4.0 is
set if the function is properly executed and the result is not equal to "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <>0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is equal to "0".

A5E00706949-01 12-9
12.8 >0 ---| |--- Result Bit Greater Than 0
Symbol
or negation /
>0 >0
Description
>0 ---| |--- (Result Bit Greater Than 0) or >0 ---| / |--- (Negated Result Bit Greater
Than Zero) contact symbols are used to recognize if the result of a math function is
greater than "0". The instructions scan the condition code bits CC 1 and CC 0 in
the status word in order to determine the relation to "0". Used in series, the result of
the scan is linked to the RLO by AND, used in parallel, it is linked to the RLO by
OR.
Status word
writes: - - - - - x x x 1
Example
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 >0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is higher than the
value of IW2, the result of the math function "IW0 - IW2" is greater than "0". Q4.0 is
set if the function is properly executed and the result is greater than "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 >0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not greater than
"0".

12-10 A5E00706949-01
12.9 <0 ---| |--- Result Bit Less Than 0
Symbol
or negation /
<0 <0
Description
<0 ---| |--- (Result Bit Less Than 0) or <0 ---| / |--- (Negated Result Bit Less Than
0) contact symbols are used to recognize if the result of a math function is less
than "0". The instructions scan the condition code bits CC 1 and CC 0 in the
status word in order to determine the relation of the result to "0". Used in series, the
RLO by OR.
Status word
writes: - - - - - x x x 1
Example
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is lower than the
value of IW2, the result of the math function "IW0 - IW2" is less than "0". Q4.0 is
set if the function is properly executed and the result is less than "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not less than "0".

A5E00706949-01 12-11
12.10 >=0 ---| |--- Result Bit Greater Equal 0
Symbol
or negation /
>=0 >=0
Description
>=0 ---| |--- (Result Bit Greater Equal 0) or >=0 ---| / |--- (Negated Result Bit
Greater Equal 0) contact symbols are used to recognize if the result of a math
function is greater than or equal to "0". The instructions scan the condition code
bits CC 1 and CC 0 in the status word in order to determine the relation to "0".
Used in series, the result of the scan is linked to the RLO by AND, used in parallel,
Status word
writes: - - - - - x x x 1
Example
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 >=0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is higher or equal
to the value of IW2, the result of the math function "IW0 - IW2" is greater than or
equal to "0". Q4.0 is set if the function is properly executed and the result is
greater than or equal to "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 >=0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not greater than or
equal to "0".

12-12 A5E00706949-01
12.11 <=0 ---| |--- Result Bit Less Equal 0
Symbol
or negation /
<=0 <=0
Description
<=0 ---| |--- (Result Bit Less Equal 0) or <=0 ---| / |--- (Negated Result Bit Less
Equal 0) contact symbols are used to recognize if the result of a math function is
less than or equal to "0". The instructions scan the condition code bits CC 1 and
CC 0 in the status word in order to determine the relation of the result to "0". Used
in series, the result of the scan is linked to the RLO by AND, used in parallel, it is
linked to the RLO by OR.
Status word
writes: - - - - - x x x 1
Examples
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <=0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is less than or
equal to the value of IW2 the result of the math function "IW0 - IW2" is less than or
equal to "0". Q4.0 is set if the function is well properly executed and the result is
less than or equal to "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 <=0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not less than or
equal to "0".

A5E00706949-01 13-1
13 Timer Instructions
13.1 Overview of Timer Instructions
Description
You can find information for setting and selecting the correct time under "Location
of a Timer in Memory and Components of a Timer".
The following timer instructions are available:
• S_PULSE Pulse S5 Timer
• S_PEXT Extended Pulse S5 Timer
• S_ODT On-Delay S5 Timer
• S_ODTS Retentive On-Delay S5 Timer
• S_OFFDT Off-Delay S5 Timer
• ---( SP ) Pulse Timer Coil
• ---( SE ) Extended Pulse Timer Coil
• ---( SD ) On-Delay Timer Coil
• ---( SS ) Retentive On-Delay Timer Coil
• ---( SA ) Off-Delay Timer Coil

Timer Instructions
13-2 A5E00706949-01
13.2 Location of a Timer in Memory and Components of a
Timer
Area in Memory
Timers have an area reserved for them in the memory of your CPU. This memory
area reserves one 16-bit word for each timer address. The ladderlogic instruction
set supports 256 timers. Please refer to your CPU’s technical information to
establish the number of timer words available.
The following functions have access to the timer memory area:
• Timer instructions
• Updating of timer words by means of clock timing. This function of your CPU in
the RUN mode decrements a given time value by one unit at the interval
designated by the time base until the time value is equal to zero.
Time Value
Bits 0 through 9 of the timer word contain the time value in binary code. The time
value specifies a number of units. Time updating decrements the time value by one
unit at an interval designated by the time base. Decrementing continues until the
time value is equal to zero. You can load a time value into the low word of
accumulator 1 in binary, hexadecimal, or binary coded decimal (BCD) format.
You can pre-load a time value using either of the following formats:
• W#16#wxyz
- Where w = the time base (that is, the time interval or resolution)
- Where xyz = the time value in binary coded decimal format
• S5T#aH_bM_cS_dMS
- Where H = hours, M = minutes, S = seconds, and MS = milliseconds;
a, b, c, d are defined by the user.
- The time base is selected automatically, and the value is rounded to the
next lower number with that time base.
The maximum time value that you can enter is 9,990 seconds, or 2H_46M_30S.
S5TIME#4S = 4 seconds
s5t#2h_15m = 2 hours and 15 minutes
S5T#1H_12M_18S = 1 hour, 12 minutes, and 18 seconds

Timer Instructions
A5E00706949-01 13-3
Time Base
Bits 12 and 13 of the timer word contain the time base in binary code. The time
base defines the interval at which the time value is decremented by one unit. The
smallest time base is 10 ms; the largest is 10 s.
Time Base Binary Code for the Time Base
10 ms 00
100 ms 01
1 s 10
10 s 11
Values that exceed 2h46m30s are not accepted. A value whose resolution is too
high for the range limits (for example, 2h10ms) is truncated down to a valid
resolution. The general format for S5TIME has limits to range and resolution as
shown below:
Resolution Range
0.01 second 10MS to 9S_990MS
0.1 second 100MS to 1M_39S_900MS
1 second 1S to 16M_39S
10 seconds 10S to 2H_46M_30S
Bit Configuration in the Time Cell
When a timer is started, the contents of the timer cell are used as the time value.
Bits 0 through 11 of the timer cell hold the time value in binary coded decimal
format (BCD format: each set of four bits contains the binary code for one decimal
value). Bits 12 and 13 hold the time base in binary code.
The following figure shows the contents of the timer cell loaded with timer value
127 and a time base of 1 second:
x x 1 0
15... ...8 7... ...0
0 0 0 1 0 0 1 0 0 1 1 1
1 2 7
Time value in BCD (0 to 999)
Time base
1 second
Irrelevant: These bits are ignored when the timer is started.

Timer Instructions
13-4 A5E00706949-01
Reading the Time and the Time Base
Each timer box provides two outputs, BI and BCD, for which you can indicate a
word location. The BI output provides the time value in binary format. The BCD
output provides the time base and the time value in binary coded decimal (BCD)
format.
Choosing the right Timer
This overview is intended to help you choose the right timer for your timing job.
t
t
t
t
t
I 0.0
Q 4.0 S_PULSE
Q 4.0 S_PEXT
Q 4.0 S_ODT
Q 4.0 S_ODTS
Q 4.0 S_OFFDT
Timer Description
S_PULSE
Pulse timer
The maximum time that the output signal remains at 1 is the same as the
programmed time value t. The output signal stays at 1 for a shorter period if
the input signal changes to 0.
S_PEXT
Extended pulse timer
The output signal remains at 1 for the programmed length of time, regardless
of how long the input signal stays at 1.
S_ODT
On-delay timer
The output signal changes to 1 only when the programmed time has elapsed
and the input signal is still 1.
S_ODTS
Retentive on-delay timer
The output signal changes from 0 to 1 only when the programmed time has
elapsed, regardless of how long the input signal stays at 1.
S_OFFDT
Off-delay timer
The output signal changes to 1 when the input signal changes to 1 or while
the timer is running. The time is started when the input signal changes from
1 to 0.

Timer Instructions
A5E00706949-01 13-5
13.3 S_PULSE Pulse S5 Timer
Symbol
S_PULSE
BI
TV
R BCD
S_IMPULS
DUAL
TW
S Q
English German
T no. T-Nr.
S Q
R DEZ
Parameter
English
Parameter
German
Data Type Memory Area Description
T no. T-Nr. TIMER T Timer identification number;
range depends on CPU
S S BOOL I, Q, M, L, D Start input
TV TW S5TIME I, Q, M, L, D Preset time value
BI DUAL WORD I, Q, M, L, D Remaining time value, integer
format
BCD DEZ WORD I, Q, M, L, D Remaining time value, BCD
format
Q Q BOOL I, Q, M, L, D Status of the timer
Description
S_PULSE (Pulse S5 Timer) starts the specified timer if there is a positive edge at
the start (S) input. A signal change is always necessary in order to enable a timer.
The timer runs as long as the signal state at input S is "1", the longest period,
however, is the time value specified by input TV. The signal state at output Q is "1"
as long as the timer is running. If there is a change from "1" to "0" at the S input
before the time interval has elapsed the timer will be stopped. In this case the
signal state at output Q is "0".
The timer is reset when the timer reset (R) input changes from "0" to "1" while the
timer is running. The current time and the time base are also set to zero. Logic "1"
at the timer's R input has no effect if the timer is not running.
The current time value can be scanned at the outputs BI and BCD. The time value
at BI is binary coded, at BCD it is BCD coded. The current time value is the initial
TV value minus the time elapsed since the timer was started.

Timer Instructions
13-6 A5E00706949-01
Timing Diagram
Pulse timer characteristics:
t t t
t = Programmed time
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
Status word
writes: - - - - - x x x 1
Example
S_PULSE
S Q
BI
TV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
timer T5 will be started. The timer will continue to run for the specified time of two
seconds (2 s) as long as I0.0 is "1". If the signal state of I0.0 changes from "1" to
"0" before the timer has expired the timer will be stopped. If the signal state of input
I0.1 changes from "0" to "1" while the timer is running, the time is reset.
The output Q4.0 is logic "1" as long as the timer is running and "0" if the time has
elapsed or was reset.

Timer Instructions
A5E00706949-01 13-7
13.4 S_PEXT Extended Pulse S5 Timer
Symbol
S_PEXT
BI
TV
R BCD
S_VIMP
DUAL
TW
S Q
English German
T no. T-Nr.
S Q
R DEZ
Parameter
English
Parameter
German
Data Type Memory
Area
Description
T no. T-Nr. TIMER T Timer identification
CPU
BI DUAL WORD I, Q, M, L, D Remaining time value,
integer format
BCD DEZ WORD I, Q, M, L, D Remaining time value,
BCD format
Description
S_PEXT (Extended Pulse S5 Timer) starts the specified timer if there is a positive
edge at the start (S) input. A signal change is always necessary in order to enable
a timer. The timer runs for the preset time interval specified at input TV even if the
signal state at the S input changes to "0" before the time interval has elapsed. The
signal state at output Q is "1" as long as the timer is running. The timer will be
restarted ("re-triggered") with the preset time value if the signal state at input S
changes from "0" to "1" while the timer is running.
The timer is reset if the reset (R) input changes from "0" to "1" while the timer is
running. The current time and the time base are set to zero.
at BI is binary coded, at BCD is BCD coded. The current time value is the initial TV
value minus the time elapsed since the timer was started.
See also "Location of a Timer in Memory and Components of a Timer".

Timer Instructions
13-8 A5E00706949-01
Timing Diagram
Extended pulse timer characteristics:
t t t
t = Programmed time
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
t
Status word
writes: - - - - - x x x 1
Example
S_PEXT
S Q
BI
TV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
timer T5 will be started. The timer will continue to run for the specified time of two
seconds (2 s) without being affected by a negative edge at input S. If the signal
state of I0.0 changes from "0" to "1" before the timer has expired the timer will be
re-triggered. The output Q4.0 is logic "1" as long as the timer is running.

Timer Instructions
A5E00706949-01 13-9
13.5 S_ODT On-Delay S5 Timer
Symbol
S_ODT
BI
TV
R BCD
S_EVERZ
DUAL
TW
S Q
English German
T no. T-Nr.
S Q
R DEZ
Parameter
English
Parameter
German
Data Type Memory
Area
Description
CPU
integer format
BCD format
Description
S_ODT (On-Delay S5 Timer) starts the specified timer if there is a positive edge at
the start (S) input. A signal change is always necessary in order to enable a timer.
The timer runs for the time interval specified at input TV as long as the signal state
at input S is positive. The signal state at output Q is "1" when the timer has elapsed
without error and the signal state at the S input is still "1". When the signal state at
input S changes from "1" to "0" while the timer is running, the timer is stopped. In
this case the signal state of output Q is "0".
The timer is reset if the reset (R) input changes from "0" to "1" while the timer is
running. The current time and the time base are set to zero. The signal state at
output Q is then "0". The timer is also reset if there is a logic "1" at the R input while
the timer is not running and the RLO at input S is "1".
at BI is binary coded, at BCD is BCD coded. The current time value is the initial TV
value minus the time elapsed since the timer was started.
See also "Location of a Timer in Memory and Components of a Timer".

Timer Instructions
13-10 A5E00706949-01
Timing Diagram
On-Delay timer characteristics:
t
t = Programmed time
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
t
t
Status word
writes: - - - - - x x x 1
Example
S_ODT
S Q
BI
TV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
If the signal state of I0.0 changes from "0" to "1" (positive edge in RLO), the timer
T5 will be started. If the time of two seconds elapses and the signal state at input
I0.0 is still "1", the output Q4.0 will be "1". If the signal state of I0.0 changes from
"1" to "0", the timer is stopped and Q4.0 will be "0" (if the signal state of I0.1
changes from "0" to "1", the time is reset regardless of whether the timer is running
or not).

Timer Instructions
A5E00706949-01 13-11
13.6 S_ODTS Retentive On-Delay S5 Timer
Symbol
S_ODTS
BI
TV
R BCD
S_SEVERZ
DUAL
TW
S Q
English German
T no. T-Nr.
S Q
R DEZ
Parameter
English
Parameter
German
Data Type Memory
Area
Description
CPU
integer format
BCD format
Description
S_ODTS (Retentive On-Delay S5 Timer) starts the specified timer if there is a
positive edge at the start (S) input. A signal change is always necessary in order to
enable a timer. The timer runs for the time interval specified at input TV even if the
signal state at input S changes to "0" before the time interval has elapsed. The
signal state at output Q is "1" when the timer has elapsed without regard to the
signal state at input S. The timer will be restarted (re-triggered) with the specified
time if the signal state at input S changes from "0" to "1" while the timer is running.
The timer is reset if the reset (R) input changes from "0" to "1" without regard to the
RLO at the S input. The signal state at output Q is then "0".

Timer Instructions
13-12 A5E00706949-01
Timing Diagram
Retentive On-Delay timer characteristics:
t t t
t = Programmed time
t
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
Status word
writes: - - - - - x x x 1
Example
S_ODTS
S Q
BI
TV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
If the signal state of I0.0 changes from "0" to "1" (positive edge in RLO), the timer
T5 will be started. The timer runs without regard to a signal change at I0.0 from "1"
to "0". If the signal state at I0.0 changes from "0" to "1" before the timer has
expired, the timer will be re-triggered. The output Q4.0 will be "1" if the timer
elapsed. (If the signal state of input I0.1 changes from "0" to "1", the time will be
reset irrespective of the RLO at S.)

Timer Instructions
A5E00706949-01 13-13
13.7 S_OFFDT Off-Delay S5 Timer
Symbol
S_OFFDT
BI
TV
R BCD
S_AVERZ
DUAL
TW
S Q
English German
T no. T-Nr.
S Q
R DEZ
Parameter
English
Parameter
German
Data Type Memory
Area
Description
CPU
integer format
BCD format
Description
S_OFFDT (Off-Delay S5 Timer) starts the specified timer if there is a negative
edge at the start (S) input. A signal change is always necessary in order to enable
a timer. The signal state at output Q is "1" if the signal state at the S input is "1" or
while the timer is running. The timer is reset when the signal state at input S goes
from "0" to "1" while the timer is running. The timer is not restarted until the signal
state at input S changes again from "1" to "0".
The timer is reset when the reset (R) input changes from "0" to "1" while the timer
is running.

Timer Instructions
13-14 A5E00706949-01
Timing Diagram
Off-Delay timer characteristics:
t t t
t = Programmed time
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
t
Status word
writes: - - - - - x x x 1
Example
S_OFFDT
S Q
BI
TV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
If the signal state of I0.0 changes from "1" to "0", the timer is started.
Q4.0 is "1" when I0.0 is "1" or the timer is running. (if the signal state at I0.1
changes from "0" to "1" while the time is running, the timer is reset).

Timer Instructions
A5E00706949-01 13-15
13.8 ---( SP ) Pulse Timer Coil
Symbol
English German
<T no..> <T no.>
---( SP ) ---( SI )
<time value> <time value>
<T no.> TIMER T Timer identification number;
<time value> S5TIME I, Q, M, L, D Preset time value
Description
---( SP ) (Pulse Timer Coil) starts the specified timer with the <time value> when
there is a positive edge on the RLO state. The timer continues to run for the
specified time interval as long as the RLO remains positive ("1"). The signal state
of the counter is ”1” as long as the timer is running. If there is a change from "1" to
"0" in the RLO before the time value has elapsed, the timer will stop. In this case, a
scan for "1" always produces the result "0".
See also "Location of a Timer in Memory and Components of a Timer" and
S_PULSE (Pulse S5 Timer).
Status word
writes: - - - - - 0 - - 0

Timer Instructions
13-16 A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SP
T5
T5 Q 4.0
S5T#2S
I 0.1 T5
R
timer T5 is started. The timer continues to run with the specified time of two
seconds as long as the signal state of input I0.0 is "1". If the signal state of input
I0.0 changes from "1" to "0" before the specified time has elapsed, the timer stops.
The signal state of output Q4.0 is "1" as long as the timer is running. A signal state
change from "0" to "1" at input I0.1 will reset timer T5 which stops the timer and
clears the remaining portion of the time value to "0".

Timer Instructions
A5E00706949-01 13-17
13.9 ---( SE ) Extended Pulse Timer Coil
Symbol
English German
<T no.> <T no>
---( SE ) ---( SV )
Description
---( SE ) (Extended Pulse Timer Coil) starts the specified timer with the specified
<time value> when there is a positive edge on the RLO state. The timer continues
to run for the specified time interval even if the RLO changes to "0" before the timer
has expired. The signal state of the counter is ”1” as long as the timer is running.
The timer will be restarted (re-triggered) with the specified time value if the RLO
changes from "0" to "1" while the timer is running.
S_PEXT (Extended Pulse S5 Timer).
Status word
writes: - - - - - 0 - - 0

Timer Instructions
13-18 A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SE
T5
T5 Q A.0
S5T#2S
I 0.1 T5
R
timer T5 is started. The timer continues to run without regard to a negative edge of
the RLO. If the signal state of I0.0 changes from "0" to "1" before the timer has
expired, the timer is re-triggered.
The signal state of output Q4.0 is "1" as long as the timer is running. A signal state
change from "0" to "1" at input I0.1 will reset timer T5 which stops the timer and
clears the remaining portion of the time value to "0".

Timer Instructions
A5E00706949-01 13-19
13.10 ---( SD ) On-Delay Timer Coil
Symbol
English German
<T no.> <T no.>
---( SD ) ---( SE )
Description
---( SD ) (On Delay Timer Coil) starts the specified timer with the <time value> if
there is a positive edge on the RLO state. The signal state of the timer is "1" when
the <time value> has elapsed without error and the RLO is still "1". When the RLO
changes from "1" to "0" while the timer is running, the timer is reset. In this case, a
scan for "1" always produces the result "0".
See also "Location of a Timer in Memory and Components of a Timer" and S_ODT
(On-Delay S5 Timer).
Status word
writes: - - - - - 0 - - 0

Timer Instructions
13-20 A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SD
T5
T5 Q A.0
S5T#2S
I 0.1 T5
R
timer T5 is started. If the time elapses and the signal state of input I0.0 is still "1",
the signal state of output Q4.0 will be "1".
If the signal state of input I0.0 changes from "1" to "0", the timer remains idle and
the signal state of output Q4.0 will be "0". A signal state change from "0" to "1" at
input I0.1 will reset timer T5 which stops the timer and clears the remaining portion
of the time value to "0".

Timer Instructions
A5E00706949-01 13-21
13.11 ---( SS ) Retentive On-Delay Timer Coil
Symbol
English German
<T no.> <T no.>
---( SS ) ---( SS )
Description
---( SS ) (Retentive On-Delay Timer Coil) starts the specified timer if there is a
positive edge on the RLO state. The signal state of the timer is "1" if the time value
has elapsed. A restart of the timer is only possible if it is reset explicitly. Only a
reset causes the signal state of the timer to be set to "0".
The timer restarts with the specified time value if the RLO changes from "0" to "1"
while the timer is running.
S_ODTS (Retentive On-Delay S5 Timer).
Status word
writes: - - - - - 0 - - 0

Timer Instructions
13-22 A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SS
T5
T5 Q A.0
S5T#2S
I 0.1 T5
R
timer T5 is started. If the signal state of input I0.0 changes from "0" to "1" before
the timer has expired, the timer is re-triggered. The output Q4.0 will be "1" if the
timer elapsed. A signal state "1" at input I0.1 will reset timer T5, which stops the
timer and clears the remaining portion of the time value to "0".

Timer Instructions
A5E00706949-01 13-23
13.12 ---( SF ) Off-Delay Timer Coil
Symbol
English German
<T no.> <T no.>
---( SF ) ---( SA )
Description
---( SF ) (Off-Delay Timer Coil) starts the specified timer if there is a negative edge
on the RLO state. The timer is "1" when the RLO is "1" or as long as the timer is
running during the <time value> interval. The timer is reset when the RLO goes
from "0" to "1" while the timer is running. The timer is always restarted when the
RLO changes from "1" to "0".
S_OFFDT (Off-Delay S5 Timer).
Status word
writes: - - - - - 0 - - 0

Timer Instructions
13-24 A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SF
T5
T5 Q A.0
S5T#2S
I 0.1 T5
R
If the signal state of input I0.0 changes from "1" to "0" the timer is started.
The signal state of output Q4.0 is "1" when input I0.0 is "1" or the timer is running.
A signal state change from "0" to "1" at input I0.1 will reset timer T5 which stops the
timer and clears the remaining portion of the time value to "0".

A5E00706949-01 14-1
14 Word Logic Instructions
14.1 Overview of Word logic instructions
Description
Word logic instructions compare pairs of words (16 bits) and double words (32 bits)
bit by bit, according to Boolean logic.
If the result at output OUT does not equal 0, bit CC 1 of the status word is set to
"1".
If the result at output OUT does equal 0, bit CC 1 of the status word is set to "0".
The following word logic instructions are available:
• WAND_W (Word) AND Word
• WOR_W (Word) OR Word
• WXOR_W (Word) Exclusive OR Word
• WAND_DW (Word) AND Double Word
• WOR_DW (Word) OR Double Word
• WXOR_DW (Word) Exclusive OR Double Word

Word Logic Instructions
14-2 A5E00706949-01
14.2 WAND_W (Word) AND Word
Symbol
WAND_W
EN ENO
IN2
OUT
IN1
IN1 WORD I, Q, M, L, D First value for logic operation
IN2 WORD I, Q, M, L, D Second value for logic operation
OUT WORD I, Q, M, L, D Result word of logic operation
Description
WAND_W (AND Words) is activated by signal state "1" at the enable (EN) input
and ANDs the two word values present at IN1 and IN2 bit by bit. The values are
interpreted as pure bit patterns. The result can be scanned at the output OUT.
ENO has the same logic state as EN.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WAND_W
IN2
IN1
EN
MW0 MW2
Q 4.0
I 0.0
2#0000000000001111
ENO
OUT
The instruction is executed if I0.0 is "1". Only bits 0 to 3 of MW0 are relevant, the
rest of MW0 is masked by the IN2 word bit pattern:
MW0 = 01010101 01010101
IN2 = 00000000 00001111
MW0 AND IN2 = MW2 = 00000000 00000101

A5E00706949-01 14-3
14.3 WOR_W (Word) OR Word
Symbol
WOR_W
EN ENO
IN2
OUT
IN1
Description
WOR_W (OR Words) is activated by signal state "1" at the enable (EN) input and
ORs the two word values present at IN1 and IN2 bit by bit. The values are
interpreted as pure bit patterns. The result can be scanned at the output OUT.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WOR_W
IN2
IN1
EN
MW0 MW2
Q 4.0
I 0.0
2#0000000000001111
ENO
OUT
The instruction is executed if I0.0 is "1". Bits 0 to 3 are set to "1", all other MW0 bits
are not changed.
MW0 = 01010101 01010101
IN2 = 00000000 00001111
MW0 OR IN2=MW2 = 01010101 01011111

14-4 A5E00706949-01
14.4 WAND_DW (Word) AND Double Word
Symbol
WAND_DW
EN ENO
IN2
OUT
IN1
IN1 DWORD I, Q, M, L, D First value for logic operation
IN2 DWORD I, Q, M, L, D Second value for logic operation
OUT DWORD I, Q, M, L, D Result double word of logic
operation
Description
WAND_DW (AND Double Words) is activated by signal state "1" at the enable
(EN) input and ANDs the two word values present at IN1 and IN2 bit by bit. The
values are interpreted as pure bit patterns. The result can be scanned at the output
OUT. ENO has the same logic state as EN.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WAND_DW
IN2
IN1
EN
MD0 MD4
Q 4.0
I 0.0
DW#16#FFF
ENO
OUT
The instruction is executed if I0.0 is "1". Only bits 0 and 11 of MD0 are relevant, the
rest of MD0 is masked by the IN2 bit pattern:
MD0 = 01010101 01010101 01010101 01010101
IN2 = 00000000 00000000 00001111 11111111
MD0 AND IN2 = MD4 = 00000000 00000000 00000101 01010101

A5E00706949-01 14-5
14.5 WOR_DW (Word) OR Double Word
Symbol
WOR_DW
EN ENO
IN2
OUT
IN1
operation
Description
WOR_DW (OR Double Words) is activated by signal state "1" at the enable (EN)
input and ORs the two word values present at IN1 and IN2 bit by bit. The values
are interpreted as pure bit patterns. The result can be scanned at the output OUT.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WOR_DW
IN2
IN1
EN
MD0 MD4
Q 4.0
I 0.0
DW#16#FFF
ENO
OUT
The instruction is executed if I0.0 is "1". Bits 0 to 11 are set to "1", the remaining
MD0 bits are not changed:
MD0 = 01010101 01010101 01010101 01010101
IN2 = 00000000 00000000 00001111 11111111
MD0 OR IN2 = MD4 = 01010101 01010101 01011111 11111111

14-6 A5E00706949-01
14.6 WXOR_W (Word) Exclusive OR Word
Symbol
WXOR_W
EN ENO
IN2
OUT
IN1
Description
WXOR_W (Exclusive OR Word) is activated by signal state "1" at the enable (EN)
input and XORs the two word values present at IN1 and IN2 bit by bit. The values
are interpreted as pure bit patterns. The result can be scanned at the output OUT.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WXOR_W
IN2
IN1
EN
MW0 MW2
Q 4.0
I 0.0
2#0000000000001111
ENO
OUT
The instruction is executed if I0.0 is "1":
MW0 = 01010101 01010101
IN2 = 00000000 00001111
MW0 XOR IN2 = MW2 = 01010101 01011010

A5E00706949-01 14-7
14.7 WXOR_DW (Word) Exclusive OR Double Word
Symbol
WXOR_DW
EN ENO
IN2
OUT
IN1
operation
Description
WXOR_DW (Exclusive OR Double Word) is activated by signal state "1" at the
enable (EN) input and XORs the two word values present at IN1 and IN2 bit by bit.
The values are interpreted as pure bit patterns. The result can be scanned at the
output OUT. ENO has the same logic state as EN.
Status word
writes: 1 x 0 0 - x 1 1 1
Example
WXOR_DW
IN2
IN1
EN
MD0 MD4
Q 4.0
I 0.0
DW#16#FFF
ENO
OUT
The instruction is executed if I0.0 is "1":
MD0 = 01010101 01010101 01010101 01010101
IN2 = 00000000 00000000 00001111 11111111
MW2 = MD0 XOR IN2 = 01010101 01010101 01011010 10101010

14-8 A5E00706949-01

A5E00706949-01 A-1
A Overview of All LAD Instructions
A.1 LAD Instructions Sorted According to English
Mnemonics (International)
English
Mnemonics
German
Mnemonics
Program Elements Catalog Description
---| |--- ---| |--- Bit logic Instruction Normally Open Contact (Address)
---|/|--- ---|/|--- Bit logic Instruction Normally Closed Contact (Address)
---( ) ---( ) Bit logic Instruction Output Coil
---(#)--- ---(#)--- Bit logic Instruction Midline Output
==0 ---| |--- ==0 ---| |--- Status bits Result Bit Equal 0
>0 ---| |--- >0 ---| |--- Status bits Result Bit Greater Than 0
>=0 ---| |--- >=0 ---| |--- Status bits Result Bit Greater Equal 0
<=0 ---| |--- <=0 ---| |--- Status bits Result Bit Less Equal 0
<0 ---| |--- <0 ---| |--- Status bits Result Bit Less Than 0
<>0 ---| |--- <>0 ---| |--- Status bits Result Bit Not Equal 0
ABS ABS Floating point Instruction Establish the Absolute Value of a Floating-
Point Number
ACOS ACOS Floating point Instruction Establish the Arc Cosine Value
ADD_DI ADD_DI Integer Math Instruction Add Double Integer
ADD_I ADD_I Integer Math Instruction Add Integer
ADD_R ADD_R Floating point Instruction Add Real
ASIN ASIN Floating point Instruction Establish the Arc Sine Value
ATAN ATAN Floating point Instruction Establish the Arc Tangent Value
BCD_DI BCD_DI Convert BCD to Double Integer
BCD_I BCD_I Convert BCD to Integer
BR ---| |--- BIE ---| |--- Status bits Exception Bit Binary Result
----(CALL) ----(CALL) Program control Call FC SFC from Coil (without
Parameters)
CALL_FB CALL_FB Program control Call FB from Box
CALL_FC CALL_FC Program control Call FC from Box
CALL_SFB CALL_SFB Program control Call System FB from Box
CALL_SFC CALL_SFC Program control Call System FC from Box
----(CD) ----(ZR) Counters Down Counter Coil
CEIL CEIL Convert Ceiling
CMP >=D CMP >=D Compare Compare Double Integer
(==, <>, >, <, >=, <=)
CMP >=I CMP >=I Compare Compare Integer (==, <>, >, <, >=, <=)
CMP >=R CMP >=R Compare Compare Real (==, <>, >, <, >=, <=)
COS COS Floating point Instruction Establish the Cosine Value

Overview of All LAD Instructions
A-2 A5E00706949-01
English
Mnemonics
German
Mnemonics
----(CU) ---( ZV ) Counters Up Counter Coil
DI_BCD DI_BCD Convert Double Integer to BCD
DI_R DI_R Convert Double Integer to Floating-Point
DIV_DI DIV_DI Integer Math Instruction Divide Double Integer
DIV_I DIV_I Integer Math Instruction Divide Integer
DIV_R DIV_R Floating point Instruction Divide Real
EXP EXP Floating point Instruction Establish the Exponential Value
FLOOR FLOOR Convert Floor
I_BCD I_BCD Convert Integer to BCD
I_DI I_DI Convert Integer to Double Integer
INV_I INV_I Convert Ones Complement Integer
INV_DI INV_DI Convert Ones Complement Double Integer
---(JMP) ---(JMP) Jumps Unconditional Jump
---(JMP) ---(JMP) Jumps Conditional Jump
---(JMPN) ---(JMPN) Jumps Jump-If-Not
LABEL LABEL Jumps Label
LN LN Floating point Instruction Establish the Natural Logarithm
---(MCR>) ---(MCR>) Program control Master Control Relay Off
---(MCR<) ---(MCR<) Program control Master Control Relay On
---(MCRA) ---(MCRA) Program control Master Control Relay Activate
---(MCRD) ---(MCRD) Program control Master Control Relay Deactivate
MOD_DI MOD_DI Integer Math Instruction Return Fraction Double Integer
MOVE MOVE Move Assign a Value
MUL_DI MUL_DI Integer Math Instruction Multiply Double Integer
MUL_I MUL_I Integer Math Instruction Multiply Integer
MUL_R MUL_R Floating point Instruction Multiply Real
---( N )--- ---( N )--- Bit logic Instruction Negative RLO Edge Detection
NEG NEG Bit logic Instruction Address Negative Edge Detection
NEG_DI NEG_DI Convert Twos Complement Double Integer
NEG_I NEG_I Convert Twos Complement Integer
NEG_R NEG_R Convert Negate Floating-Point Number
---| NOT |--- ---| NOT |--- Bit logic Instruction Invert Power Flow
---( OPN ) ---( OPN ) DB call Open Data Block: DB or DI
OS ---| |--- OS ---| |--- Status bits Exception Bit Overflow Stored
OV ---| |--- OV ---| |--- Status bits Exception Bit Overflow
---( P )--- ---( P )--- Bit logic Instruction Positive RLO Edge Detection
POS POS Bit logic Instruction Address Positive Edge Detection
---( R ) ---( R ) Bit logic Instruction Reset Coil
---(RET) ---(RET) Program control Return
ROL_DW ROL_DW Shift/Rotate Rotate Left Double Word
ROR_DW ROR_DW Shift/Rotate Rotate Right Double Word
ROUND ROUND Convert Round to Double Integer
RS RS Bit logic Instruction Reset-Set Flip Flop
---( S ) ---( S ) Bit logic Instruction Set Coil
---( SAVE ) ---( SAVE ) Bit logic Instruction Save RLO into BR Memory
---( SC ) ---( SZ ) Counters Set Counter Value

A5E00706949-01 A-3
English
Mnemonics
German
Mnemonics
S_CD Z_RUECK Counters Down Counter
S_CU Z_VORW Counters Up Counter
S_CUD ZAEHLER Counters Up-Down Counter
---( SD ) ---( SE ) Timers On-Delay Timer Coil
---( SE ) ---( SV ) Timers Extended Pulse Timer Coil
---( SF ) ---( SA ) Timers Off-Delay Timer Coil
SHL_DW SHL_DW Shift/Rotate Shift Left Double Word
SHL_W SHL_W Shift/Rotate Shift Left Word
SHR_DI SHR_DI Shift/Rotate Shift Right Double Integer
SHR_DW SHR_DW Shift/Rotate Shift Right Double Word
SHR_I SHR_I Shift/Rotate Shift Right Integer
SHR_W SHR_W Shift/Rotate Shift Right Word
SIN SIN Floating point Instruction Establish the Sine Value
S_ODT S_EVERZ Timers On-Delay S5 Timer
S_ODTS S_SEVERZ Timers Retentive On-Delay S5 Timer
S_OFFDT S_AVERZ Timers Off-Delay S5 Timer
---( SP ) ---( SI ) Timers Pulse Timer Coil
S_PEXT S_VIMP Timers Extended Pulse S5 Timer
S_PULSE S_IMPULS Timers Pulse S5 Timer
SQR SQR Floating point Instruction Establish the Square
SQRT SQRT Floating point Instruction Establish the Square Root
SR SR Bit logic Instruction Set-Reset Flip Flop
---( SS ) ---( SS ) Timers Retentive On-Delay Timer Coil
SUB_DI SUB_DI Integer Math Instruction Subtract Double Integer
SUB_I SUB_I Integer Math Instruction Subtract Integer
SUB_R SUB_R Floating point Instruction Subtract Real
TAN TAN Floating point Instruction Establish the Tangent Value
TRUNC TRUNC Convert Truncate Double Integer Part
UO ---| |--- UO ---| |--- Status bits Exception Bit Unordered
WAND_DW WAND_DW Word logic Instruction AND Double Word
WAND_W WAND_W Word logic Instruction AND Word
WOR_DW WOR_DW Word logic Instruction OR Double Word
WOR_W WOR_W Word logic Instruction OR Word
WXOR_DW WXOR_DW Word logic Instruction Exclusive OR Double Word
WXOR_W WXOR_W Word logic Instruction Exclusive OR Word

A-4 A5E00706949-01
A.2 LAD Instructions Sorted According to German
Mnemonics (SIMATIC)
German
Mnemonics
English
Mnemonics
Program
Elements Catalog
Description
---| |--- ---| |--- Bit logic Instruction Normally Open Contact (Address)
---|/|--- ---|/|--- Bit logic Instruction Normally Closed Contact (Address)
---( ) ---( ) Bit logic Instruction Output Coil
---(#)--- ---(#)--- Bit logic Instruction Midline Output
==0 ---| |--- ==0 ---| |--- Status bits Result Bit Equal 0
>0 ---| |--- >0 ---| |--- Status bits Result Bit Greater Than 0
>=0 ---| |--- >=0 ---| |--- Status bits Result Bit Greater Equal 0
<=0 ---| |--- <=0 ---| |--- Status bits Result Bit Less Equal 0
<0 ---| |--- <0 ---| |--- Status bits Result Bit Less Than 0
<>0 ---| |--- <>0 ---| |--- Status bits Result Bit Not Equal 0
ABS ABS Floating point
Instruction
Establish the Absolute Value of a Floating-Point
Number
ACOS ACOS Floating point
Instruction
Establish the Arc Cosine Value
ADD_DI ADD_DI Integer Math
Instruction
Add Double Integer
ADD_I ADD_I Integer Math
Instruction
Add Integer
ADD_R ADD_R Floating point
Instruction
Add Real
ASIN ASIN Floating point
Instruction
Establish the Arc Sine Value
ATAN ATAN Floating point
Instruction
Establish the Arc Tangent Value
BCD_DI BCD_DI Convert BCD to Double Integer
BCD_I BCD_I Convert BCD to Integer
BIE ---| |--- BR ---| |--- Status bits Exception Bit Binary Result
----(CALL) ----(CALL) Program control Call FC SFC from Coil (without Parameters)
CALL_FB CALL_FB Program control Call FB from Box
CALL_FC CALL_FC Program control Call FC from Box
CALL_SFB CALL_SFB Program control Call System FB from Box
CALL_SFC CALL_SFC Program control Call System FC from Box
CEIL CEIL Convert Ceiling
CMP >=D CMP >=D Compare Compare Double Integer (==, <>, >, <, >=, <=)
CMP >=I CMP >=I Compare Compare Integer (==, <>, >, <, >=, <=)
CMP >=R CMP >=R Compare Compare Real (==, <>, >, <, >=, <=)
COS COS Floating point
Instruction
Establish the Cosine Value
DI_BCD DI_BCD Convert Double Integer to BCD

A5E00706949-01 A-5
German
Mnemonics
English
Mnemonics
Program
Elements Catalog
Description
DI_R DI_R Convert Double Integer to Floating-Point
DIV_DI DIV_DI Integer Math
Instruction
Divide Double Integer
DIV_I DIV_I Integer Math
Instruction
Divide Integer
DIV_R DIV_R Floating point
Instruction
Divide Real
EXP EXP Floating point
Instruction
Establish the Exponential Value
FLOOR FLOOR Convert Floor
I_BCD I_BCD Convert Integer to BCD
I_DI I_DI Convert Integer to Double Integer
INV_I INV_I Convert Ones Complement Integer
INV_DI INV_DI Convert Ones Complement Double Integer
---(JMP) ---(JMP) Jumps Conditional Jump
---(JMP) ---(JMP) Jumps Unconditional Jump
---(JMPN) ---(JMPN) Jumps Jump-If-Not
LABEL LABEL Jumps Label
LN LN Floating point
Instruction
Establish the Natural Logarithm
---(MCR>) ---(MCR>) Program control Master Control Relay Off
---(MCR<) ---(MCR<) Program control Master Control Relay On
---(MCRA) ---(MCRA) Program control Master Control Relay Activate
---(MCRD) ---(MCRD) Program control Master Control Relay Deactivate
MOD_DI MOD_DI Integer Math
Instruction
Return Fraction Double Integer
MOVE MOVE Move Assign a Value
MUL_DI MUL_DI Integer Math
Instruction
Multiply Double Integer
MUL_I MUL_I Integer Math
Instruction
Multiply Integer
MUL_R MUL_R Floating point
Instruction
Multiply Real
---( N )--- ---( N )--- Bit logic Instruction Negative RLO Edge Detection
NEG NEG Bit logic Instruction Address Negative Edge Detection
NEG_DI NEG_DI Convert Twos Complement Double Integer
NEG_I NEG_I Convert Twos Complement Integer
NEG_R NEG_R Convert Negate Floating-Point Number
---| NOT |--- ---| NOT |--- Bit logic Instruction Invert Power Flow
---( OPN ) ---( OPN ) DB call Open Data Block: DB or DI
OS ---| |--- OS ---| |--- Status bits Exception Bit Overflow Stored
OV ---| |--- OV ---| |--- Status bits Exception Bit Overflow
---( P )--- ---( P )--- Bit logic Instruction Positive RLO Edge Detection

A-6 A5E00706949-01
German
Mnemonics
English
Mnemonics
Program
Elements Catalog
Description
POS POS Bit logic Instruction Address Positive Edge Detection
---( R ) ---( R ) Bit logic Instruction Reset Coil
---(RET) ---(RET) Program control Return
ROL_DW ROL_DW Shift/Rotate Rotate Left Double Word
ROR_DW ROR_DW Shift/Rotate Rotate Right Double Word
ROUND ROUND Convert Round to Double Integer
RS RS Bit logic Instruction Reset-Set Flip Flop
---( S ) ---( S ) Bit logic Instruction Set Coil
---( SA ) ---( SF ) Timers Off-Delay Timer Coil
---( SAVE ) ---( SAVE ) Bit logic Instruction Save RLO into BR Memory
S_AVERZ S_OFFDT Timers Off-Delay S5 Timer
---( SE ) ---( SD ) Timers On-Delay Timer Coil
S_EVERZ S_ODT Timers On-Delay S5 Timer
SHL_DW SHL_DW Shift/Rotate Shift Left Double Word
SHL_W SHL_W Shift/Rotate Shift Left Word
SHR_DI SHR_DI Shift/Rotate Shift Right Double Integer
SHR_DW SHR_DW Shift/Rotate Shift Right Double Word
SHR_I SHR_I Shift/Rotate Shift Right Integer
SHR_W SHR_W Shift/Rotate Shift Right Word
---( SI ) ---( SP ) Timers Pulse Timer Coil
S_IMPULS S_PULSE Timers Pulse S5 Timer
SIN SIN Floating point
Instruction
Establish the Sine Value
SQR SQR Floating point
Instruction
Establish the Square
SQRT SQRT Floating point
Instruction
Establish the Square Root
SR SR Bit logic Instruction Set-Reset Flip Flop
---( SS ) ---( SS ) Timers Retentive On-Delay Timer Coil
S_SEVERZ S_ODTS Timers Retentive On-Delay S5 Timer
SUB_DI SUB_DI Integer Math
Instruction
Subtract Double Integer
SUB_I SUB_I Integer Math
Instruction
Subtract Integer
SUB_R SUB_R Floating point
Instruction
Subtract Real
---( SV ) ---( SE ) Timers Extended Pulse Timer Coil
S_VIMP S_PEXT Timers Extended Pulse S5 Timer
---( SZ ) ---( SC ) Counters Set Counter Value
TAN TAN Floating point
Instruction
Establish the Tangent Value
TRUNC TRUNC Convert Truncate Double Integer Part
UO ---| |--- UO ---| |--- Status bits Exception Bit Unordered

A5E00706949-01 A-7
German
Mnemonics
English
Mnemonics
Program
Elements Catalog
Description
WAND_DW WAND_DW Word logic
Instruction
AND Double Word
WAND_W WAND_W Word logic
Instruction
AND Word
WOR_DW WOR_DW Word logic
Instruction
OR Double Word
WOR_W WOR_W Word logic
Instruction
OR Word
WXOR_DW WXOR_DW Word logic
Instruction
Exclusive OR Double Word
WXOR_W WXOR_W Word logic
Instruction
Exclusive OR Word
ZAEHLER S_CUD Counters Up-Down Counter
----(ZR) ----(CD) Counters Down Counter Coil
Z_RUECK S_CD Counters Down Counter
---( ZV ) ----(CU) Counters Up Counter Coil
Z_VORW S_CU Counters Up Counter

A-8 A5E00706949-01

A5E00706949-01 B-1
B Programming Examples
B.1 Overview of Programming Examples
Practical Applications
Each ladder logic instruction described in this manual triggers a specific operation.
When you combine these instructions into a program, you can accomplish a wide
variety of automation tasks. This chapter provides the following examples of
practical applications of the ladder logic instructions:
• Controlling a conveyor belt using bit logic instructions
• Detecting direction of movement on a conveyor belt using bit logic instructions
• Generating a clock pulse using timer instructions
• Keeping track of storage space using counter and comparison instructions
• Solving a problem using integer math instructions
• Setting the length of time for heating an oven
Instructions Used
Mnemonik Program Elements Catalog Description
WAND_W Word logic instruction (Word) And Word
WOR_W Word logic instruction (Word) Or Word
--- ( CD ) Counters Down Counter Coil
--- ( CU ) Counters Up Counter Coil
---( R ) Bit logic instruction Reset Coil
---( S ) Bit logic instruction Set Coil
---( P ) Bit logic instruction Positive RLO Edge Detection
ADD_I Floating-Point instruction Add Integer
DIV_I Floating-Point instruction Divide Integer
MUL_I Floating-Point instruction Multiply Integer
CMP <=I, CMP >=I Compare Compare Integer
––| |–– Bit logic instruction Normally Open Contact
––| / |–– Bit logic instruction Normally Closed Contact
––( ) Bit logic instruction Output Coil
---( JMPN ) Jumps Jump-If-Not
---( RET ) Program control Return
MOVE Move Assign a Value
--- ( SE ) Timers Extended Pulse Timer Coil

Programming Examples
B-2 A5E00706949-01
B.2 Example: Bit Logic Instructions
Example 1: Controlling a Conveyor Belt
The following figure shows a conveyor belt that can be activated electrically. There
are two push button switches at the beginning of the belt: S1 for START and S2 for
STOP. There are also two push button switches at the end of the belt: S3 for
START and S4 for STOP. It is possible to start or stop the belt from either end.
Also, sensor S5 stops the belt when an item on the belt reaches the end.
MOTOR_ON
S1
S2
O Start
O Stop
S3
S4
O Start
O Stop
Sensor S5
Absolute and symbolic Programming
You can write a program to control the conveyor belt using absolute values or
symbols that represent the various components of the conveyor system.
You need to make a symbol table to correlate the symbols you choose with
absolute values (see the STEP 7 Online Help).
System Component Absolute Address Symbol Symbol Table
Push Button Start Switch I 1.1 S1 I 1.1 S1
Push Button Stop Switch I 1.2 S2 I 1.2 S2
Push Button Start Switch I 1.3 S3 I 1.3 S3
Push Button Stop Switch I 1.4 S4 I 1.4 S4
Sensor I 1.5 S5 I 1.5 S5
Motor Q 4.0 MOTOR_ON Q 4.0 MOTOR_ON

A5E00706949-01 B-3
Ladder Logic Program to control the conveyor belt
Network 1: Pressing either start switch turns the motor on.
I 1.1
I 1.3
S
Q 4.0
S1
S3
Network 2: Pressing either stop switch or opening the normally closed contact at
the end of the belt turns the motor off.
I 1.2
R
Q 4.0
S2
I 1.4
S4
I 1.5
S5

B-4 A5E00706949-01
Example 2: Detecting the Direction of a Conveyor Belt
The following figure shows a conveyor belt that is equipped with two photoelectric
barriers (PEB1 and PEB2) that are designed to detect the direction in which a
package is moving on the belt. Each photoelectric light barrier functions like a
normally open contact.
PEB1
PEB2 Q 4.1
Q 4.0
Absolute and symbolic Programming
You can write a program to activate a direction display for the conveyor belt system
using absolute values or symbols that represent the various components of the
conveyor system.
You need to make a symbol table to correlate the symbols you choose with
absolute values (see the STEP 7 Online Help).
System Component Absolute Address Symbol Symbol Table
Photoelectric barrier 1 I 0.0 PEB1 I 0.0 PEB1
Photoelectric barrier 2 I 0.1 PEB2 I 0.1 PEB2
Display for movement to
right
Q 4.0 RIGHT Q 4.0 RIGHT
Display for movement to left Q 4.1 LEFT Q 4.1 LEFT
Pulse memory bit 1 M 0.0 PMB1 M 0.0 PMB1
Pulse memory bit 2 M 0.1 PMB2 M 0.1 PMB2

A5E00706949-01 B-5
Ladder Logic Program for Detecting the Direction of a Conveyor Belt
Network 1: If there is a transition in signal state from 0 to 1 (positive edge) at input I
0.0 and, at the same time, the signal state at input I 0.1 is 0, then the package on
the belt is moving to the left.
I 0.0
PEB1
P
M 0.0
PMB1
I 0.1
PEB2
S
Q 4.1
LEFT
Network 2: If there is a transition in signal state from 0 to 1 (positive edge) at input I
0.1 and, at the same time, the signal state at input I 0.0 is 0, then the package on
the belt is moving to the right. If one of the photoelectric light barriers is broken, this
means that there is a package between the barriers.
I 0.1
PEB2
P
M 0.1
PMB2
I 0.0
PEB1
S
Q 4.0
RIGHT
Network 3: If neither photoelectric barrier is broken, then there is no package
between the barriers. The direction pointer shuts off.
R
Q 4.1
LEFT
I 0.1
PEB2
I 0.0
PEB1
R
Q 4.0
RIGHT

B-6 A5E00706949-01
B.3 Example: Timer Instructions
Clock Pulse Generator
You can use a clock pulse generator or flasher relay when you need to produce a
signal that repeats periodically. A clock pulse generator is common in a signalling
system that controls the flashing of indicator lamps.
When you use the S7-300, you can implement the clock pulse generator function
by using time-driven processing in special organization blocks. The example shown
in the following ladder logic program, however, illustrates the use of timer functions
to generate a clock pulse. The sample program shows how to implement a
freewheeling clock pulse generator by using a timer.
Ladder Logic Program to Generate a Clock Pulse (pulse duty factor 1:1)
Network 1: If the signal state of timer T1 is 0, load the time value 250 ms into T1
and start T1 as an extended-pulse timer.
T1
SE
M0.2
S5T#250MS
Network 2: The state of the timer is saved temporarily in an auxiliary memory
marker.
M0.2
T1
Network 3: If the signal state of timer T1 is 1, jump to jump label M001.
M001
JMP
M0.2
Network 4: When the timer T1 expires, the memory word 100 is incremented by 1.
ADD_I
IN1
ENO
EN
IN2
OUT
MW100
1
MW100

A5E00706949-01 B-7
Network 5: The MOVE instruction allows you to output the different clock
frequencies at outputs Q12.0 through Q13.7.
MW100
MOVE
IN OUT
EN ENO
AW12
M001
Signal Check
A signal check of timer T1 produces the following result of logic operation (RLO) for
opener M0.2.
0
1
250 ms
As soon as the time runs out, the timer is restarted. Because of this, the signal
check made by ––| / |–– M0.2 produces a signal state of 1 only briefly.
The negated (inverted) RLO:
0
1
250 ms
Every 250 ms the RLO bit is 0. The jump is ignored and the contents of memory
word MW100 is incremented by 1.

B-8 A5E00706949-01
Achieving a Specific Frequency
From the individual bits of memory bytes MB101 and MB100 you can achieve the
following frequencies:
Bits of MB101/MB100 Frequency in Hz Duration
M 101.0 2.0 0.5 s (250 ms on / 250 ms off)
M 101.1 1.0 1 s (0.5 s on / 0.5 s off)
M 101.2 0.5 2 s (1 s on / 1 s off)
M 101.3 0.25 4 s (2 s on / 2 s off)
M 101.4 0.125 8 s (4 s on / 4 s off)
M 101.5 0.0625 16 s (8 s on / 8 s off)
M 101.6 0.03125 32 s (16 s on / 16 s off)
M 101.7 0.015625 64 s (32 s on / 32 s off)
M 100.0 0.0078125 128 s (64 s on / 64 s off)
M 100.1 0.0039062 256 s (128 s on / 128 s off)
M 100.2 0.0019531 512 s (256 s on / 256 s off)
M 100.3 0.0009765 1024 s (512 s on / 512 s off)
M 100.4 0.0004882 2048 s (1024 s on / 1024 s off)
M 100.5 0.0002441 4096 s (2048 s on / 2048 s off)
M 100.6 0.000122 8192 s (4096 s on / 4096 s off)
M 100.7 0.000061 16384 s (8192 s on / 8192 s off)
Signal states of the Bits of Memory MB 101
Scan
Cycle
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Time Value
in ms
0 0 0 0 0 0 0 0 0 250
1 0 0 0 0 0 0 0 1 250
2 0 0 0 0 0 0 1 0 250
3 0 0 0 0 0 0 1 1 250
4 0 0 0 0 0 1 0 0 250
5 0 0 0 0 0 1 0 1 250
6 0 0 0 0 0 1 1 0 250
7 0 0 0 0 0 1 1 1 250
8 0 0 0 0 1 0 0 0 250
9 0 0 0 0 1 0 0 1 250
10 0 0 0 0 1 0 1 0 250
11 0 0 0 0 1 0 1 1 250
12 0 0 0 0 1 1 0 0 250

A5E00706949-01 B-9
Signal state of Bit 1 of MB 101 (M 101.1)
Frequency = 1/T = 1/1 s = 1 Hz
M 101.1
250 ms 0.5 s 0.75 s 1 s 1.25 s 1.5 s
T
Time
0
1
0

B-10 A5E00706949-01
B.4 Example: Counter and Comparison Instructions
Storage Area with Counter and Comparator
The following figure shows a system with two conveyor belts and a temporary
storage area in between them. Conveyor belt 1 delivers packages to the storage
area. A photoelectric barrier at the end of conveyor belt 1 near the storage area
determines how many packages are delivered to the storage area. Conveyor belt 2
transports packages from the temporary storage area to a loading dock where
trucks take the packages away for delivery to customers. A photoelectric barrier at
the end of conveyor belt 2 near the storage area determines how many packages
leave the storage area to go to the loading dock. A display panel with five lamps
indicates the fill level of the temporary storage area.
Display Panel
Storage area
empty
(Q 12.0)
Storage area
not empty
(Q 12.1)
Storage area
50% full
(Q 15.2)
Storage area
90% full
(Q 15.3)
Storage area
Filled to capacity
(Q 15.4)
Temporary
storage area
for 100
packages
Packages in Packages out
Conveyor belt 2
Conveyor belt 1
Photoelectric barrier 1 Photoelectric barrier 2
I 12.0 I 12.1

A5E00706949-01 B-11
Ladder Logic Program that Activates the Indicator Lamps on the Display Panel
Network 1: Counter C1 counts up at each signal change from ”0” to ”1” at input CU
and counts down at each signal change from ”0” to ”1” at input CD. With a signal
change from ”0” to ”1” at input S, the counter value is set to the value PV. A signal
change from ”0” to ”1” at input R resets the counter value to ”0”. MW200 contains
the current counter value of C1. Q12.1 indicates ”storage area not empty”.
Q 12.1
I 12.3
I 12.1
I 12.2
I 12.0 S_CUD
CD
Q
CU
S
PV CV
R CV_BCD
C1
MW210
C#10
MW200
Network 2: Q12.0 indicates ”storage area empty”.
Q 12.1 Q 12.1
Network 3: If 50 is less than or equal to the counter value (in other words if the
current counter value is greater than or equal to 50), the indicator lamp for ”storage
area 50% full” is lit.
Q 15.2
CMP
IN1
<= I
IN2
50
MW210
Network 4: Network 4: If the counter value is greater than or equal to 90, the
indicator lamp for ”storage area 90% full” is lit.
Q 15.3
CMP
IN1
>= I
IN2
MW210
90

B-12 A5E00706949-01
Network 5: If the counter value is greater than or equal to 100, the indicator lamp
for ”storage area full” is lit.
Q 15.4
CMP
IN1
>= I
IN2
MW210
100

A5E00706949-01 B-13
B.5 Example: Integer Math Instructions
Solving a Math Problem
The sample program shows you how to use three integer math instructions to
produce the same result as the following equation:
MW4 = ((IW0 + DBW3) x 15) / MW0
Ladder Logic Program
Network 1: Open Data Block DB1.
OPN
DB1
Network 2: Input word IW0 is added to shared data word DBW3 (data block must
be defined and opened) and the sum is loaded into memory word MW100. MW100
is then multiplied by 15 and the answer stored in memory word MW102. MW102 is
divided by MW0 with the result stored in MW4.
ADD_I
IN1
ENO
EN
IN2 OUT
DBW3
IW0
MW100
MUL_I
IN1
ENO
EN
IN2 OUT
MW100
15 MW102
DIV_I
IN1
ENO
EN
IN2 OUT
MW102
MW0 MW4

B-14 A5E00706949-01
B.6 Example: Word Logic Instructions
Heating an Oven
The operator of the oven starts the oven heating by pushing the start push button.
The operator can set the length of time for heating by using the thumbwheel
switches shown in the figure. The value that the operator sets indicates seconds in
binary coded decimal (BCD) format.
Thumbwheels for setting BCD digits
1 0 0 1 0 0 0 1
X X X X 0 0 0 1
Oven
Heat
Q 4.0
IW0
4 4 4
Start push button I 0.7
7....
IB1
IB0 Bytes
Bits
7...
...0 ...0
System Component Absolute Address
Start Push Button I 0.7
Thumbwheel for ones I 1.0 to I 1.3
Thumbwheel for tes I 1.4 to I 1.7
Thumbwheel for hundreds I 0.0 to I 0.3
Heating starts Q 4.0

A5E00706949-01 B-15
Ladder Logic Program
Network 1: If the timer is running, then turn on the heater.
T1 Q 4.0
Network 2: If the timer is running, the Return instruction ends the processing here.
T1
RET
Network 3: Mask input bits I 0.4 through I 0.7 (that is, reset them to 0). These bits
of the thumbwheel inputs are not used. The 16 bits of the thumbwheel inputs are
combined with W#16#0FFF according to the (Word) And Word instruction. The
result is loaded into memory word MW1. In order to set the time base of seconds,
the preset value is combined with W#16#2000 according to the (Word) Or Word
instruction, setting bit 13 to 1 and resetting bit 12 to 0.
WAND_W
IN1
ENO
EN
IN2
OUT
W#16#FFF
IW0 MW1
WOR_W
IN1
ENO
EN
IN2
OUT
MW1
W#16#2000
MW2
Network 4: Start timer T 1 as an extended pulse timer if the start push button is
pressed, loading as a preset value memory word MW2 (derived from the logic
above).
I 0.7
SE
T1
MW2

B-16 A5E00706949-01

A5E00706949-01 C-1
C Working with Ladder Logic
C.1 EN/ENO Mechanism
The enable (EN) and enable output (ENO) of FBD/LAD boxes is achieved by
means of the BR bit.
If EN and ENO are connected, the following applies:
ENO = EN AND NOT (box error)
If no error occurs (box error = 0), ENO = EN.
The EN/ENO mechanism is used for:
• Math instructions,
• Transfer and conversion instructions,
• Shift and rotate instructions,
• Block calls.
This mechanism is not used for:
• Comparisons,
• Counters,
• Timers.
Around the actual instructions in the box, additional STL instructions are generated
for the EN/ENO mechanism with dependency on the existing preceding and
subsequent logic operations. The four possible cases are shown using the example
of an adder:
1. Adder with EN and with ENO Connected
2. Adder with EN and without ENO Connected
3. Adder without EN and with ENO Connected
4. Adder without EN and without ENO Connected

C-2 A5E00706949-01
Note on Creating Your Own Blocks
If you want to program blocks which you want to call in FBD or LAD, you must
ensure that the BR bit is set when the block is exited. The fourth example shows
that this is not automatically the case. You cannot use the BR as a memory bit
because it is constantly overwritten by the EN/ENO mechanism. Instead, use a
temporary variable in which you save any errors which occur. Initialize this variable
with 0. At each point in the block at which you think an unsuccessful instruction
represents an error for the whole block, set this variable using the assistance of the
EN/ENO mechanism. A NOT and a SET coil will be sufficient for this. At the end of
the block program the following network:
end: AN error
SAVE
Ensure that this network is processed in every case, which means you must not
use BEC within the block and skip this network.

A5E00706949-01 C-3
C.1.1 Adder with EN and with ENO Connected
If the adder has an EN and an ENO connected, the following STL instructions are
triggered:
1 A I 0.0 // EN connection
2 JNB _001 // Shift RLO into BR and jump if RLO = 0
3 L in1 // Box parameter
5 +I // Actual addition
6 T out // Box parameter
7 AN OV // Error recognition
8 SAVE // Save error in BR
9 CLR // First check
10 _001: A BR // Shift BR into RLO
11 = Q 4.0
Following line 1 the RLO contains the result of the preceding logic operation. The
JNB instruction copies the RLO into the BR bit and sets the first check bit.
• If the RLO = 0, the program jumps to line 10 and resumes with A BR. The
addition is not executed. In line 10 the BR is copied into the RLO again and 0 is
thus assigned to the output.
• If the RLO = 1, the program does not jump, meaning the addition is executed.
In line 7 the program evaluates whether an error occurred during addition, this
is then stored in BR in line 8. Line 9 sets the first check bit. Now the BR bit is
copied back into the RLO in line 10 and thus the output shows whether the
addition was successful or not.
The BR bit is not changed by lines 10 and 11, so it also shows whether the
addition was successful.

C-4 A5E00706949-01
C.1.2 Adder with EN and without ENO Connected
If the adder has an EN but no ENO connected, the following STL instructions are
triggered:
1 A I 0.0 // EN connection
2 JNB _001 // Shift RLO into BR and jump if RLO = 0
7 _001: NOP 0
Following line 1 the RLO contains the result of the preceding logic operation. The
JNB instruction copies the RLO into the BR bit and sets the first check bit.
• If the RLO = 0, the program jumps to line 7 and the addition is not executed.
The RLO and BR are 0.
• If RLO was 1, the program does not jump, meaning the addition is executed.
The program does not evaluate whether an error occurred during addition. The
RLO and BR are 1.

A5E00706949-01 C-5
C.1.3 Adder without EN and with ENO Connected
If the adder has no EN but an ENO connected, the following STL instructions are
triggered:
5 AN OV // Error recognition
6 SAVE // Save error in BR
7 CLR // First check
8 A BR // Shift BR into RLO
9 = Q 4.0
The addition is executed in every case. In line 5 the program evaluates whether an
error occurred during addition, this is then stored in BR in line 6. Line 7 sets the
first check bit. Now the BR bit is copied back into the RLO in line 8 and thus the
output shows whether the addition was successful or not.
The BR bit is not changed by lines 8 and 9, so it also shows whether the addition
was successful.

C-6 A5E00706949-01
C.1.4 Adder without EN and without ENO Connected
If the adder has no EN and no ENO connected, the following STL instructions are
triggered:
5 NOP 0
The addition is executed. The RLO and the BR bit remain unchanged.

A5E00706949-01 C-7
C.2 Parameter Transfer
The parameters of a block are transferred as a value. With function blocks a copy
of the actual parameter value in the instance data block is used in the called block.
With functions a copy of the actual value lies in the local data stack. Pointers are
not copied. Prior to the call the INPUT values are copied into the instance DB or to
the L stack. After the call the OUTPUT values are copied back into the variables.
Within the called block you can only work on a copy. The STL instructions required
for this are in the calling block and remain hidden from the user.
Note
If memory bits, inputs, outputs or peripheral I/Os are used as actual address of a
function they are treated in a different way than the other addresses. Here,
updates are carried out directly, not via L Stack.
Exception:
If the corresponding formal parameter is an input parameter of the data type
BOOL, the current parameters are updated via the L stack.
Caution
When programming the called block, ensure that the parameters declared as OUTPUT are
also written. Otherwise the values output are random! With function blocks the value will be
the value from the instance DB noted by the last call, with functions the value will be the
value which happens to be in the L stack.
Note the following points:
• Initialize all OUTPUT parameters if possible.
• Try not to use any Set and Reset instructions. These instructions are
dependent on the RLO. If the RLO has the value 0, the random value will be
retained.
• If you jump within the block, ensure that you do not skip any locations where
OUTPUT parameters are written. Do not forget BEC and the effect of the
MCR instructions.

C-8 A5E00706949-01

A5E00706949-01 Index-1
Index
(
---( )....................................................... 1-6
---( # )---.................................................. 1-8
---( CD ) ................................................ 4-12
---( CU ) ................................................ 4-10
---( JMPN ).............................................. 6-4
---( N )--- ............................................... 1-18
---( P )---................................................ 1-19
---( R )................................................... 1-10
---( S ) ................................................... 1-12
---( SA )............................................... 13-23
---( SC )................................................... 4-9
---( SD )............................................... 13-19
---( SE ).................................... 13-17, 13-19
---( SF )............................................... 13-23
---( SI ) ................................................ 13-15
---( SP )............................................... 13-15
---( SS )............................................... 13-21
---( SV )............................................... 13-17
---( SZ )................................................... 4-9
---( ZR )................................................. 4-12
---( ZV )................................................. 4-10
---(Call) ................................................. 10-2
---(JMP)---........................................ 6-2, 6-3
---(MCR<) ........................................... 10-14
---(MCR>) ................................ 10-16, 10-17
---(MCRA)........................................... 10-18
---(MCRD)........................................... 10-19
---(OPN).................................................. 5-1
---(RET) .............................................. 10-20
---(SAVE).............................................. 1-20
(Word) AND Double Word.................... 14-4
(Word) AND Word ................................ 14-2
(Word) Exclusive OR Double Word...... 14-7
(Word) Exclusive OR Word .................. 14-6
(Word) OR Double Word...................... 14-5
(Word) OR Word................................... 14-3
|
---| |---................................................. 12-1
---| |---.................................................... 1-2
---| / |---........................................... 1-3, 12-1
--|NOT|-- ................................................. 1-5
<
<=0 ---| |---........................................12-12
<=0 ---| / |---.........................................12-12
<>0 ---| |---..........................................12-8
<>0 ---| / |---...........................................12-8
<0 ---| |---.........................................12-10
<0 ---| / |---...........................................12-10
=
==0 ---| |---..........................................12-7
==0 ---| / |---...........................................12-7
>
>=0 ---| |---........................................12-11
>=0 ---| / |---........................................12-11
>0 ---| |---...........................................12-9
>0 ---| / |---.............................................12-9
A
ABS.........................................................8-8
ACOS....................................................8-17
Add Double Integer.................................7-7
Add Integer .............................................7-3
Add Real .................................................8-3
ADD_DI...................................................7-7
ADD_I .....................................................7-3
ADD_R....................................................8-4
Adder with EN and with
ENO Connected ................................. C-3
Adder with EN and without
ENO Connected ................................. C-4
Adder without EN and with
ENO Connected ................................. C-5
Adder without EN and without
ENO Connected ................................. C-6
Address Negative Edge Detection........1-21
Address Positive Edge Detection .........1-22
ASIN......................................................8-16
Assign a Value........................................9-1
ATAN ....................................................8-18

Index
Index-2 A5E00706949-01
B
BCD to Double Integer ........................... 3-5
BCD to Integer........................................ 3-2
BCD_DI .................................................. 3-5
BCD_I..................................................... 3-2
Bit Exclusive OR..................................... 1-4
BR ---| |--- .......................................... 12-6
BR ---| / |---............................................ 12-6
C
Call Block from a Library .................... 10-13
Call FB from Box .................................. 10-4
Call FC from Box .................................. 10-6
Call FC SFC from Coil
(without Parameters) ........................ 10-2
Call Multiple Instance ......................... 10-12
Call System FB from Box ..................... 10-8
Call System FC from Box................... 10-10
CALL_FB.............................................. 10-4
CALL_FC.............................................. 10-6
CALL_SFB............................................ 10-8
CALL_SFC ......................................... 10-10
CEIL...................................................... 3-15
Ceiling................................................... 3-15
CMP ? D................................................. 2-4
CMP ? I................................................... 2-2
CMP ? R................................................. 2-6
Conditional Jump.................................... 6-3
COS...................................................... 8-14
D
DI_BCD .................................................. 3-6
DI_REAL................................................. 3-7
DIV_DI.................................................. 7-10
DIV_I....................................................... 7-6
DIV_R..................................................... 8-7
Divide Double Integer........................... 7-10
Divide Integer ......................................... 7-6
Divide Real ............................................. 8-7
Double Integer to BCD ........................... 3-6
Double Integer to Floating-Point............. 3-7
Down Counter......................................... 4-7
Down Counter Coil ............................... 4-12
E
EN/ENO Mechanism.......................C-1, C-2
Establish the Absolute Value
of a Floating-Point Number .................8-8
Establish the Arc Cosine Value ............8-17
Establish the Arc Sine Value ................8-16
Establish the Arc Tangent Value ..........8-18
Establish the Cosine Value...................8-14
Establish the Exponential Value ...........8-11
Establish the Natural Logarithm............8-12
Establish the Sine Value.......................8-13
Establish the Square...............................8-9
Establish the Square Root....................8-10
Establish the Tangent Value.................8-15
Evaluating the Bits of the
Status Word with Integer Math
Instructions..........................................7-2
Evaluation of the Bits in the
Status Word.........................................8-2
Example
Bit Logic Instructions...........................B-2
Counter and Comparison
Instructions ....................................B-10
Integer Math Instructions...................B-13
Timer Instructions................................B-6
Word Logic Instructions.....................B-14
Exception Bit Binary Result ..................12-6
Exception Bit Overflow..........................12-2
Exception Bit Overflow Stored..............12-3
Exception Bit Unordered.......................12-5
EXP.......................................................8-11
Extended Pulse S5 Timer .....................13-7
Extended Pulse Timer Coil .................13-17
F
Floating-Point Math Instructions .............8-2
Floor......................................................3-16
FLOOR..................................................3-16
I
I_BCD .....................................................3-3
I_DINT.....................................................3-4
Immediate Read....................................1-23
Immediate Write...........................1-24, 1-25
Important Notes on
Using MCR Functions .....................10-13
Integer to BCD ........................................3-3
Integer to Double Integer........................3-4
INV_DI ....................................................3-9
INV_I .......................................................3-8
Invert Power Flow ...................................1-5

Index
A5E00706949-01 Index-3
J
Jump Instructions ................................... 6-5
Jump-If-Not............................................. 6-4
L
Label....................................................... 6-5
LABEL .................................................... 6-5
LAD Instructions Sorted According
to English Mnemonics
(International)......................................A-1
LAD Instructions Sorted According
to German Mnemonics (SIMATIC) .....A-4
LN ......................................................... 8-12
Location of a Timer in Memory
and Components of a Timer ............. 13-2
M
Master Control Relay Activate............ 10-18
Master Control Relay Deactivate........ 10-19
Master Control Relay Off.................... 10-16
Master Control Relay On.................... 10-14
Midline Output ........................................ 1-8
Mnemonics
English (International).........................A-1
German (SIMATIC).............................A-4
MOD_DI................................................ 7-11
MOVE..................................................... 9-2
MUL_DI .................................................. 7-9
MUL_I..................................................... 7-5
MUL_R ................................................... 8-6
Multiply Double Integer........................... 7-9
Multiply Integer ....................................... 7-5
Multiply Real........................................... 8-6
N
NEG...................................................... 1-21
NEG_DI ................................................ 3-11
NEG_I................................................... 3-10
NEG_R ................................................. 3-12
Negate Floating-Point Number............. 3-12
Negated Exception Bit Binary Result ... 12-6
Negated Exception Bit Overflow........... 12-2
Negated Exception Bit Overflow Stored12-3
Negated Exception Bit Unordered........ 12-5
Negated Result Bit Equal 0 .................. 12-7
Negated Result Bit Greater Equal 0... 12-11
Negated Result Bit Greater Than 0...... 12-9
Negated Result Bit Less Equal 0........ 12-12
Negated Result Bit Less Than 0......... 12-10
Negated Result Bit Not Equal 0............ 12-8
Negative RLO Edge Detection ............. 1-18
Normally Closed Contact (Address)....... 1-3
Normally Open Contact (Address)..........1-2
O
Off-Delay S5 Timer .............................13-13
Off-Delay Timer Coil ...........................13-23
On-Delay S5 Timer ...............................13-9
On-Delay Timer Coil ...........................13-19
Ones Complement Double Integer .........3-9
Ones Complement Integer......................3-8
Online-Hilfe .............................................1-3
Open Data Block
DB or DI...............................................5-1
OS ---| |---...........................................12-3
OS ---| / |---............................................12-3
Output Coil..............................................1-6
OV ---| |---...........................................12-2
OV ---| / |---............................................12-2
Overview of Bit Logic Instructions...........1-1
Overview of Comparison Instructions.....2-1
Overview of Conversion Instructions ......3-1
Overview of Counter Instructions............4-1
Overview of Floating-Point Math
Instructions..........................................8-1
Overview of Integer Math
Instructions..........................................7-1
Overview of Logic Control
Instructions..........................................6-1
Overview of Programming Examples .....B-1
Overview of Rotate Instructions..........11-11
Overview of Shift Instructions ...............11-1
Overview of Timer Instructions .............13-1
Overview of Word Logic Instructions ....14-1
Overview over Program Control
Instructions........................................10-1
P
Parameter Transfer................................ C-7
POS ......................................................1-22
Positive RLO Edge Detection ...............1-19
Practical Applications..............................B-1
Pulse S5 Timer .....................................13-5
Pulse Timer Coil..................................13-15
R
Reset Coil .............................................1-10
Reset-Set Flip Flop ...............................1-14
Result Bit Equal 0 .................................12-7
Result Bit Greater Equal 0..................12-11
Result Bit Greater Than 0.....................12-9
Result Bit Less Equal 0.......................12-12
Result Bit Less Than 0........................12-10
Result Bit Not Equal 0...........................12-8
Retentive On-Delay S5 Timer.............13-11

Index
Index-4 A5E00706949-01
Retentive On-Delay Timer Coil........... 13-21
Return................................................. 10-20
Return Fraction Double Integer............ 7-11
ROL_DW ............................................ 11-12
ROR_DW................................. 11-13, 11-14
Rotate Left Double Word.................... 11-11
Rotate Right Double Word ................. 11-13
ROUND ................................................ 3-13
Round to Double Integer ...................... 3-13
RS......................................................... 1-14
S
S_AVERZ ........................................... 13-13
S_CD...................................................... 4-7
S_CU...................................................... 4-5
S_CUD ................................................... 4-3
S_EVERZ ............................................. 13-9
S_IMPULS............................................ 13-5
S_ODT.................................................. 13-9
S_ODTS ............................................. 13-11
S_OFFDT ........................................... 13-13
S_PEXT................................................ 13-7
S_PULSE ............................................. 13-5
S_SEVERZ......................................... 13-11
S_VIMP ................................................ 13-7
Save RLO into BR Memory.................. 1-20
Set Coil................................................. 1-12
Set Counter Value .................................. 4-9
Set-Reset Flip Flop............................... 1-16
Shift Left Double Word ......................... 11-8
Shift Left Word...................................... 11-5
Shift Right Double Integer .................... 11-4
Shift Right Double Word....................... 11-9
Shift Right Integer................................. 11-2
Shift Right Word ................................... 11-7
SHL_DW............................................... 11-8
SHL_W ........................................ 11-5, 11-6
SHR_DI ................................................ 11-4
SHR_DW................................... 11-9, 11-10
SHR_I.......................................... 11-2, 11-3
SHR_W................................................. 11-7
SIN........................................................ 8-13
SQR........................................................ 8-9
SQRT....................................................8-10
SR .........................................................1-16
SUB_DI...................................................7-8
SUB_I......................................................7-4
SUB_R....................................................8-5
Subtract Double Integer..........................7-8
Subtract Integer ......................................7-4
Subtract Real ..........................................8-5
T
TAN.......................................................8-15
TRUNC .................................................3-14
Truncate Double Integer Part ...............3-14
Twos Complement Double Integer .......3-11
Twos Complement Integer....................3-10
U
Unconditional Jump ................................6-2
UO ---| |---...........................................12-5
UO ---| / |---............................................12-5
Up Counter..............................................4-5
Up Counter Coil ....................................4-10
Up-Down Counter ...................................4-3
W
WAND_DW...........................................14-4
WAND_W..............................................14-2
WOR_DW .............................................14-5
WOR_W................................................14-3
WXOR_DW...........................................14-7
WXOR_W .............................................14-6
X
XOR ........................................................1-4
Z
Z_RUECK ...............................................4-7
Z_VORW.................................................4-5
ZÄHLER..................................................4-3

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