Siemens s7 300 programming

AUTOMATION TRAINING
of
SIEMENS
S7-300 PROGRAMMING

CONTENTS: PAGE NO
1. STEP7 OVERVIEW 4
2. COMPARISON OF CPU's AND MODULES AVAILABLE 8
3. ADDRESSING OF MODULES 10
4. LOAD MEMORY AND WORK MEMORY 12
5. BLOCKS IN THE USER PROGRAM 14
6. DATA TYPES 15
7. STATEMENT LIST PROGRAMMING 17
8. BIT LOGIC INSTRUCTIONS 24
9. COMPARISON INSTRUCTIONS 28
10.CONVERSION INSTRUCTIONS 30
11.COUNTER INSTRUCTIONS 39
12.DATA BLOCK AND LOGIC CONTROL INSTRUCTIONS 46
13.LOAD AND TRANSFER INSTRUCTIONS 49
14.FLOATING POINT MATH INSTRUCTIONS 50
15.INTEGER MATH INSTRUCTIONS 52
16.PROGRAM CONTROL INSTRUCTIONS 55
17.SHIFT INSTRUCTIONS 57
18.TIMER INSTRUCTIONS 59
19.WORD LOGIC INSTRUCTIONS 72
20.ACCUMULATOR INSTRUCTIONS 74
21.PROGRAMMING EXAMPLES 76
22.GLOSSARY 87
SIMATIC S7
PAGE 2

PLC RANGE
S7-400 HIGH END RANGE/MEDIUM RANGE
S7-300 MID AND LOW END PERFORMANCE
RANGE
S7-200 MICRO PLC'S
SIMATIC S7-300 COMPONENTS
S.No. COMPONENT FUNCTION
1. Rail Accomodates the S7-300 modules
2. Power Supply (PS) Converts the power system voltage (120/230VAC) into
24VDC for the S7-300 and load power supply for 24
VDC load circuits.
3. CPU Executes the user program, provides the 5V supply
For the S7-300 backplane bus, communicates with
other CPU's or with a programming device via the
MPI(Multi Point Interface).
4. Signal Modules(SM)-
DI,DO,AI,AO
Match different process signal levels to the internal
signal level of S7-300
5. Function Modules (FMs) For time critical and memory intensive process signal
processing tasks eg. Closed loop control
6. Communication Processor
(CP)
Relieves the CPU of communication tasks eg-CP 342-5
DP for connection to SINEC L2-DP.
7. Interface Module(IM) Interconnects the individual tiers of an S7-300
8. Sinec L2 cable with LAN
connector
Interconnects CPUs and PCs
9. Programmer Cable Connects a CPU to a programming device
10. RS 485 Repeater Interfaces the S7-300 over large distances to other S7-
300s or programming devices
PAGE 3

Overview of STEP 7
What is STEP 7?
• STEP 7 is the standard software package used for configuring and programming
SIMATIC programmable logic controllers. It is part of the SIMATIC industry software.
Basic Tasks
When you create an automation solution with STEP 7, there are a series of basic tasks. The following
figure shows the tasks that need to be performed for most projects and assigns them to a basic
procedure.
Alternative Procedures
As shown in the figure above, you have two alternative procedures:
PAGE 4

• You can configure the hardware first and then program the blocks.
• You can, however, program the blocks first without configuring the hardware. This is
recommended for service and maintenance work, for example, to integrate programmed
blocks into in an existing project.
Brief Description of the Individual Steps
• Installation and authorization
The first time you use STEP 7, install it and transfer the authorization from diskette to the hard
disk
• Plan your controller
Before you work with STEP 7, plan your automation solution from dividing the process into
individual tasks to creating a configuration diagram Design the program structure
Turn the tasks described in the draft of your controller design into a program structure using
the blocks available in STEP 7
• Start STEP 7
You start STEP 7 from the Windows 95/98/NT user interface
• Create a project structure
A project is like a folder in which all data are stored in a hierarchical structure and are
available to you at any time. After you have created a project, all other tasks are executed in
this project Configure a station
When you configure the station you specify the programmable controller you want to use; for
example, SIMATIC 300, SIMATIC 400
• Configure hardware
When you configure the hardware you specify in a configuration table which modules you
want to use for your automation solution and which addresses are to be used to access the
modules from the user program. The properties of the modules can also be assigned using
• Configure networks and communication connections
The basis for communication is a pre-configured network. For this, you will need to create the
subnets required for your automation networks, set the subnet properties, and set the network
connection properties and any communication connections required for the networked
stations
• Define symbols
You can define local or shared symbols, which have more descriptive names, in a symbol
table to use instead of absolute addresses in your user program
• Create the program
Using one of the available programming languages create a program linked to a module or
independent of a module and store it as blocks, source files, or charts
• S7 only: generate and evaluate reference data
You can make use of these reference data to make debugging and modifying your user
program easier
• Configure messages
You create block-related messages, for example, with their texts and attributes. Using the
transfer program you transfer the message configuration data created to the operator
interface system database (for example, SIMATIC WinCC, SIMATIC ProTool)
• Configure operator control and monitoring variables
You create operator control and monitoring variables once in STEP 7 and assign them the
required attributes. Using the transfer program you transfer the operator control and
monitoring variables created to the database of the operator interface system WinCC
• Download programs to the programmable controller
S7 only: after all configuration, parameter assignment, and programming tasks are
completed, you can download your entire user program or individual blocks from it to the
programmable controller (programmable module for your hardware solution).
• Test programs
S7 only: for testing you can either display the values of variables from your user program or a
CPU, assign values to the variables, and create a variable table for the variables that you
want to display or modify
PAGE 5

• Monitor operation, diagnose hardware
You determine the cause of a module fault by displaying online information about a module.
You determine the causes for errors in user program processing with the help of the
diagnostic buffer and the stack contents. You can also check whether a user program can run
on a particular CPU
• Document the plant
After you have created a project/plant, it makes sense to produce clear documentation of the
project data to make further editing of the project and any service activities easier
PAGE 6

COMPARISON OF CPU'S
CPU's CPU312IFM CPU313 CPU314IFM CPU314
Mem Statement/Bytes 2K/6KB 4K/12KB 8K/24KB 16K/48KB
Memory Cards - 512KB
FEPROM
- 512KB
FEPROM
Processing Time 1024
Statements
0.6 ms 0.6 ms 0.3 ms 0.3 ms
DI & DO Max 256 256 1024 1024
AI & AO Max 64 64 256 256
Rack Configuration 1-Tier 1-Tier 4-Tier 4-Tier
Expansion Modules Max 8 8 31 31
Bit Memories 1024 2048 2048 2048
Counters 32 32 64 64
Timers 64 64 72 128
MPI Interface
187.5 Kbit/s
Max 32 Nodes
Yes Yes Yes Yes
Integrated
functions+Interfaces
10DI/6DQ
onboard. int.
functions:Count
ers/Freq.
Measuremensts
- 20DI/16DQ
,4AI,1AO
onboard. int.
functions:Co
unters/Freq.
Measuremen
sts/Positionin
g PID Control
-
CPU's CPU315 CPU315-2DP CPU316-2DP CPU318-2
Mem Statement/Bytes 16K/48KB 16K/48KB 42K/128KB 256KB
Memory Cards 512KB FEPROM 512KB
FEPROM
4MB
FEPROM
4MB FEPROM
Processing Time 1024
Statements
0.3 ms 0.3 ms 0.3 ms 0.1 ms
DI & DO Max 1024 2048 4096 16384
AI & AO Max 256 256 256 1024
Rack Configuration 4-Tier 4-Tier 4-Tier 4-Tier
Expansion Modules Max 32 32 32 32
Bit Memories 2048 2048 2048 8192
Counters 64 64 64 512
Timers 128 128 128 512
MPI Interface
187.5 Kbit/s
Max 32 Nodes
Yes Yes Yes Upto 12Mbaud
Integrated
functions+Interfaces
- PROFIBUS-
DP
Master/Slave
(64 DP
stations,12M
baud)
PROFIBUS-
DP
Master/Slave
(64 DP
stations,12M
baud)
PROFIBUS-DP
Master/Slave
(125 DP
stations,12Mb
aud)
PAGE 7

* 1 K statements correspond to approx. 3Kbytes of user memory.
PAGE 8

THE DIFFERENT TYPES OF MODULES AVAILABLE ARE
1. SIGNAL MODULES - FOR DIGITAL AND ANALOG SIGNALS
DIGITAL INPUTS DIGITAL OUTPUTS
• 16 X 24 VDC
• 8 X 120 / 230 VAC
• 16 X 120 V AC
• 32 X 24 V DC
• 16 x 24 VDC ,0.5A
• 8 X 24 VDC ,2A
• 8 X 120 / 230 VAC, 2A
• 16 X 120 VAC, 1A
• 32 X 24 V DC, 0.5A
RELAY OUTPUTS DI/DO MODULES
• 8 X Relay 30 VDC ,0.5A
• 8 X Relay 250 VAC ,3A
• 16 X Relay 30VDC,0.5A
• 16 X Relay 120VAC, 2.5A
• 8DI/8DO X 24VDC 0.5A
ANALOG INPUTS PARAMETERIZABLE ANALOG OUTPUTS PARAMETERIZABLE
• 8 Analog Inputs/ 2 Analog Inputs
• +/- 10V , +/- 50 mV, +/-1 V, +/-20 Ma, 4 to
20mA, Pt100, Thermocouple
• 4 Analog Outputs/ 2 Analog Outputs
• +/-10V, +/-50mV, +/-1 V, +/-20 mV, 4 to 20
mA
2. FUNCTION MODULES
• High Speed Counter Modules - Upto 100 KHz range
• Positioning Modules - For position control, Stepper Motor Control, Cam Controllers
All function modules are enclosed and can be installed in any slot.
3. COMMUNICATION PROCESSORS - FOR DATA EXCHANGE WITH PRINTERS,COMPUTERS,
SIMATIC SYSTEMS
• CP340 - Point to Point Communication for the serial link with RS232, 3964R and any ASCII
protocol
4. INTERFACE MODULES - FOR MULTI TIER CONFIGURATION
• For Central Controller Expansion
• For Expansion Unit Connection
5. POWER SUPPLY MODULES - FOR 24 VDC LOAD CIRCUITS WITH DIFFERENT RATINGS.
MPI - MULTI POINT INTERFACE FOR COMMUNICATION
• MPI INTEGRATED IN CPU
• DATA EXCHANGE RATE : 187.5 Kbits / s
PAGE 9

MUMBAI-64 TEL.: 022-8883737
• SIMULTANEOUS COMMUNICATION WITH PG/PC/OP(OPERATOR PANEL) AND FURTHER
PLCS REQUIRING NO ADDITIONAL HARDWARE
• UPTO 32 NODES CAN BE CONNECTED
ADDRESSING OF MODULES
MUMBAI OFF: 43, DATTANI CHAMBERS, NEAR NEW ERA THEATRE, S.V. ROAD, MALAD(W)
Slot Addressing for Rack 0
•
CPU
RACK 0
Slot Number 1 2 3
Digital Address
Analog Address
4
0
256
PS
5
4
272
11
28
368
10
24
352
9
20
336
8
16
320
7
12
304
6
8
288
Module Starting Addresses of the Signal Modules on Rack 0
4
64
512
4
32
384
6
40
416
7
44
432
8
48
448
9
52
464
10
56
480
11
60
496
5
36
400
RACK 1
Slot Number 3
Digital Address
Analog Address
CPU IM AI / AO / DI / DO Modules

CPU IM AI / AO / DI / DO Modules
RACK 3
Slot Number 3
Digital Address
Analog Address
5
100
656
11
124
752
10
120
736
9
116
720
8
112
704
7
108
688
6
104
672
4
64
512
4
96
640
RACK 2
Slot Number 3
Digital Address
Analog Address
5
68
528
11
92
624
10
88
608
9
84
592
8
80
576
7
76
560
6
72
544
4
64
512
4
64
512

PUNE OFF: C-17,PAWANA IND. EST., T-204, MIDC - BHOSARI, PUNE-411026
Rack 0
4
CPU
Slot Number 1 2 (IM) 3
PS
1110
Rack 1
111098744
64Connecting cable 368
Slot Number IM 5 6
512
Rack 2
111098744
64Connecting cable 368
Slot Number IM 5 6
512
Rack 3
Slot Number IM 5 1110987644
64
512
98765

Load Memory and Work Memory in the CPU
After completing the configuration, parameter assignment, and program creation and establishing the
online connection, you can download complete user programs or individual blocks to a programmable
controller. To test individual blocks, you must download at least one organization block (OB) and the
function blocks (FB) and functions (FC) called in the OB and the data blocks (DB) used. To download
the system data created when the hardware was configured, the networks configured, and the
connection table created to the programmable controller, you download the object “System Data".
You download user programs to a programmable controller using the SIMATIC Manager, for example,
during the end phase of the program testing or to run the finished user program.
Relationship - Load Memory and Work Memory
The complete user program is downloaded to the load memory; the parts relevant to program
execution are also loaded into the work memory.
CPU Load Memory
• The load memory is used to store the user program without the symbol table and the
comments (these remain in the memory of the programming device).
• Blocks that are not marked as required for startup will be stored only in the load memory.
• The load memory can either be RAM, ROM, or EPROM memory, depending on the
programmable controller.
CPU Work Memory
The work memory (integrated RAM) is used to store the parts of the user program required for
program processing.
Possible Downloading/Uploading Procedures
You use the download function to download the user program or loadable objects (for example,
blocks) to the programmable controller. If a block already exists in the RAM of the CPU, you will be
prompted to confirm whether or not the block should be overwritten.
• You can select the loadable objects in the project window and download them from the
SIMATIC Manager (menu command: PLC > Download).
• When programming blocks and when configuring hardware and networks you can directly
download the object you were currently editing using the menu in the main window of the
application you are working with (menu command: PLC > Download).
• Another possibility is to open an online window with a view of the programmable controller (for
example, using View > Online or PLC > Display Accessible Nodes) and copy the object
you want to download to the online window.
Alternatively you can upload the current contents of blocks from the RAM load memory of the CPU to
your programming device via the load function.
PAGE 13

Blocks in the User Program
The STEP 7 programming software allows you to structure your user program, in other words to break
down the program into individual, self-contained program sections. This has the following advantages:
• Extensive programs are easier to understand.
• Individual program sections can be standardized.
• Program organization is simplified.
• It is easier to make modifications to the program.
• Debugging is simplified since you can test separate sections.
• Commissioning your system is made much easier.
The example of an industrial blending process illustrated the advantages of breaking down an
automation process into individual tasks. The program sections of a structured user program
correspond to these individual tasks and are known as the blocks of a program.
Block Types
There are several different types of blocks you can use within an S7 user program:
Block Brief Description Of Function
Organization blocks (OB) OBs determine the structure of the user program.
System function blocks (SFB)
and system functions (SFC)
SFBs and SFCs are integrated in the S7 CPU and allow you
access to some important system functions.
Function blocks (FB) FBs are blocks with a "memory" which you can program yourself.
Functions (FC) FCs contain program routines for frequently used functions.
Instance data blocks
(instance DB)
Instance DBs are associated with the block when an FB/SFB is
called. They are created automatically during compilation.
Data blocks (DB) DBs are data areas for storing user data. In addition to the data
that are assigned to a function block, shared data can also be
defined and used by any blocks.
OBs, FBs, SFBs, FCs, and SFCs contain sections of the program and are therefore also known as
logic blocks. The permitted number of blocks per block type and the permitted length of the blocks is
CPU-specific.
PAGE 14

DATA TYPES
Introduction to Data Types and Parameter Types
All the data in a user program must be identified by a data type. The following data types are
available:
• Elementary data types provided by STEP 7
• Complex data types that you yourself can create by combining elementary data types
• Parameter types with which you define parameters to be transferred to FBs or FCs
General Information
Statement List, Ladder Logic, and Function Block Diagram instructions work with data objects of
specific sizes. Bit logic instructions work with bits, for example. Load and transfer instructions (STL)
and move instructions (LAD and FBD) work with bytes, words, and double words.
A bit is a binary digit "0" or "1." A byte is made up of eight bits, a word of 16 bits, and a double word of
32 bits.
Math instructions also work with bytes, words, or double words. In these byte, word, or double word
addresses you can code numbers of various formats such as integers and floating-point numbers.
When you use symbolic addressing, you define symbols and specify a data type for these symbols
(see table below). Different data types have different format options and number notations.
This chapter describes only some of the ways of writing numbers and constants. The following table
lists the formats of numbers and constants that will not be explained in detail.
Format Size in Bits Number Notation
Hexadecimal 8, 16, and 32 B#16#, W#16#, and DW#16#
Binary 8, 16, and 32 2#
date 16 D#
time 32 T#
Time of day 32 TOD#
Character 8 'A'
Elementary Data Types
Each elementary data type has a defined length. The following table lists the elementary data types.
Type and
Description
Size
in
Bits
Format Options
Range and Number
Notation (lowest
to highest value)_
Example
BOOL(Bit)
Boolean text TRUE/FALSE TRUE
BYTE
(Byte)
8
Hexadecimal number
B16#0 to B16#FF
L B#16#10
L byte#16#10
WORD
(Word)
16
Binary number
Hexadecimal number
BCD
Decimal number unsigned
2. 0 to
2#1111_1111_1111_1111
W#16#0 to W#16#FFFF
C#0 to C#999
B#(0.0) to B#(255.255)
L 2#0001_0000_0000_0000
L W#16#1000
L word16#1000
L C#998
L B#(10,20)
L byte#(10,20)
DWORD 32 Binary number 2#0 to 2#1000_0001_0001_1000_
PAGE 15

(Double word)
Hexadecimal number
Decimal number unsigned
2#1111_1111_1111_1111
1111_1111_1111_1111
DW#16#0000_0000 to
DW#16#FFFF_FFFF
B#(0,0,0,0) to
B#(255,255,255,255)
1011_1011_0111_1111
L DW#16#00A2_1234
L dword#16#00A2_1234
L B#(1, 14, 100, 120)
L byte#(1,14,100,120)
INT
(Integer)
16 Decimal number signed -32768 to 32767 L 1
DINT
(Integer, 32 bits)
32 Decimal number signed
L#-2147483648 to
L#2147483647
L L#1
REAL
(Floating-point
number)
32
IEEE
Floating-point number
Upper limit: 3.402823e+38
Lower limit: 1.175 495e-38
L 1.234567e+13
S5TIME
(SIMATIC time)
16
S7 time in
steps of
10 ms (default)
S5T#0H_0M_0S_10MS to
S5T#2H_46M_30S_0MS
and
S5T#0H_0M_0S_0MS
L S5T#0H_1M_0S_0MS
L
S5TIME#0H_1H_1M_0S_0
MS
TIME
(IEC time)
32
IEC time in steps of 1 ms,
integer signed
-
T#24D_20H_31M_23S_64
8MS to
T#24D_20H_31M_23S_64
7MS
L T#0D_1H_1M_0S_0MS
L
TIME#0D_1H_1M_0S_0MS
DATE
(IEC date)
16 IEC date in steps of 1 day
D#1990-1-1 to
D#2168-12-31
L D#1996-3-15
L DATE#1996-3-15
TIME_OF_DAY
(Time)
32 Time in steps of 1 ms
TOD#0:0:0.0 to
TOD#23:59:59.999
L TOD#1:10:3.3
L TIME_OF_DAY#1:10:3.3
CHAR
(Character)
8 ASCII characters 'A','B' etc. L 'E'
Parameter Types
In addition to elementary and complex data types, you can also define parameter types for formal
parameters that are transferred between blocks. STEP 7 recognizes the following parameter types:
• TIMER or COUNTER: this specifies a particular timer or particular counter that will be used
when the block is executed. If you supply a value to a formal parameter of the TIMER or
COUNTER parameter type, the corresponding actual parameter must be a timer or a counter,
in other words, you enter "T" or "C" followed by a positive integer.
• BLOCK: specifies a particular block to be used as an input or output. The declaration of the
parameter determines the block type to be used (FB, FC, DB etc.). If you supply values to a
formal parameter of the BLOCK parameter type, specify a block address as the actual
parameter. Example: “FC101" (when using absolute addressing) or “Valve" (with symbolic
addressing).
Parameter Capacity Description
TIMER 2. Byte
s
Indicates a timer to be used by the program in the called logic block.
Format: T1
PAGE 16

COUNTER 2 bytes
Indicates a counter to be used by the program in the called logic block.
Format: C10
BLOCK_FB
BLOCK_FC
BLOCK_DB
BLOCK_SDB
2 bytes
Indicates a block to be used by the program in the called logic block.
Format: FC101
DB42
PAGE 17

PROGRAMMING IN STATEMENT LIST
What is Statement List?
Statement List (STL) is a textual programming language that can be used to create the code section
of logic blocks. Its syntax for statements is similar to assembler language and consists of instructions
followed by addresses on which the instructions act.
The Programming Language STL
Of all the programming languages with which you can program S7 controllers, STL is the closest to
the machine code MC7 of the S7 CPU. This means that by using it to program S7 controllers, you can
optimize the run time and the use of memory.
The programming language STL has all the necessary elements for creating a complete user
program. It contains a comprehensive range of instructions. A total of over 130 different basic
instructions and a wide range of addresses are available. Functions and function blocks allow you to
structure your STL program clearly.
The Programming Package
The STL programming package is an integral part of the STEP 7 Standard Software. This means that
following the installation of your STEP 7 software, all the editor functions, compiler functions and
test/debug functions for STL are available to you.
Using STL, you can create your own user program as follows:
_ With the Incremental Editor. The input of the local data structure is made easier with the help of
table editors.
_ With a source file in the Text Editor. Text input is made easier with the help of block templates.
There are three programming languages in the standard software, STL, FBD, and LAD. You can
switch from one language to the other almost without restriction and choose the most suitable
language for the particular block you are programming.
If you write programs in LAD or FBD, you can always switch over to the STL representation. If you
convert LAD programs into FBD programs and vice versa, program elements that cannot be
represented in the destination language are displayed in STL.
A STATEMENT CONSISTS OF AN INSTRUCTION AND AN ADDRESS
Address of an Instruction
The address of an instruction indicates a constant or the location where the instruction finds a value
(data object) on which to perform an operation. The address can have a symbolic name or an
absolute designation. The address can point to any of the following items :
_ A constant, the value of a timer or counter, or an ASCII character string to be loaded into
accumulator 1 (for example, L +27 See Table 2.1)
_ A bit in the status word of the programmable logic controller
_ A symbolic name (for example, A Motor.On, see Table 2-3)
_ A data block and a location within the data block area (for example, L DB4.DBD10, see Table 2-4)
_ A function (FC), function block (FB), integrated system function (SFC), or integrated system function
block (SFB) and the number of the function or block (see Table 2-5)
_ An address identifier and a location within the memory area that is indicated by the address
identifier (for example, A I 1.0)
PAGE 18

COMMANDS USED IN STATEMENT LIST
• Bit Logic Instructions
) Nesting Closed
= Assign
A And
A( And with Nesting Open
AN And Not
AN( And Not with Nesting Open
FN Edge Negative
FP Edge Positive
O Or
O And before Or
O( Or with Nesting Open
ON Or Not
ON( Or Not with Nesting Open
R Reset
S Set
PAGE 25

Comparison Instructions
PAGE 29

31
Conversion Instructions
AUTOMATION & CONTROL SYTEMS PAGE
MUMBAI-64 TEL.: 022-8883737

BTD BCD to Double Integer (32-Bit)
Example:
L MD10 Load the BCD number into ACCU 1.
BTD Convert from BCD to integer; store result in ACCU 1.
T MD20 Transfer result (double integer number) to MD20.
BTI BCD to Integer (16-Bit)
Example:
L MW10 Load the BCD number into ACCU 1-L.
BTI Convert from BCD to integer; store result in ACCU 1-L.
T MW20 Transfer result (integer number) to MW20.
CAD Change Byte Sequence in ACCU 1 (32-Bit)
Example:
L MD10 Load the value of MD10 into ACCU 1.
CAD Reverse the sequence of bytes in ACCU 1.
T MD20 Transfer the results to MD20.
Contents of ACCU 1 before execution of CAD:
ACCU 1-H-H: ACCU 1-H-L: ACCU 1-L-H: ACCU 1-L-L:
value "A" value "B" value "C" value "D"
Contents of ACCU 1 after execution of CAD:
value "D" value "C" value "B" value "A"
PAGE 32

CAW Change Byte Sequence in ACCU 1-L (16-Bit)
Example:
L MW10 Load the value of MW10 into ACCU 1.
CAW Reverse the sequence of bytes in ACCU 1-L.
T MW20 Transfer the result to MW20.
Contents of ACCU 1 before execution of CAW:
value "A" value "B" value "C" value "D"
Contents of ACCU 1 after execution of CAW:
value "A" value "B" value "D" value "C"
DTB Double Integer (32-Bit) to BCD
Example:
L MD10 Load the 32-bit integer into ACCU 1.
DTB Convert from integer (32-bit) to BCD, store result in ACCU 1.
T MD20 Transfer result (BCD number) to MD20.
PAGE 33

DTR Double Integer (32-Bit) to Floating-Point Number (32-Bit, IEEE-FP)
Example:
L MD10 Load the 32-bit integer into ACCU 1.
DTR Convert from double integer to floating point (32-bit IEEE FP); store result in
ACCU 1.
T MD20 Transfer result (BCD number) to MD20.
INVD Ones Complement Double Integer (32-Bit)
Example:
Bit 31 16 15 0
Contents of ACCU 1
before execution of INVD 0110 1111 1000 1100 0110 0011 1010 1110
Contents of ACCU 1
after execution of INVD 1001 0000 0111 0011 1001 1100 0101 0001
L ID8 Load value into ACCU 1.
INVD Form ones complement (32-bit).
T MD10 Transfer result to MD10.
PAGE 34

INVI Ones Complement Integer (16-Bit)
Example:
Bit 15 0
Contents of ACCU 1-L before execution of INVI 0110 0011 1010 1110
Contents of ACCU 1-L after execution of INVI 1001 1100 0101 0001
L IW8 Load value into ACCU 1-L.
INVI Form ones complement 16-bit.
T MW10 Transfer result to MW10.
ITB Integer (16-Bit) to BCD
Example:
L MW10 Load the integer number into ACCU 1-L.
ITB Convert from integer to BCD (16-bit); store result in ACCU 1-L.
T MW20 Transfer result (BCD number) to MW20.
PAGE 35

ITD Integer (16-Bit) to Double Integer (32-Bit)
Example:
L MW12 Load the integer number into ACCU 1.
ITD Convert from integer (16-bit) to double integer (32-bit); store result in
ACCU 1.
T MD20 Transfer result (double integer) to MD20.
MW12 = "-10" (Integer, 16-bit):
ACCU 1-H ACCU 1-L
Bit: 31 16 : 15 0
Contents of ACCU 1 before execution of ITD: XXXX XXXX XXXX XXXX 1111 1111 1111 0110
Contents of ACCU 1 after execution of ITD: 1111 1111 1111 1111 1111 1111 1111 0110
(X = 0 or 1, bits are not used for conversion)
NEGD Twos Complement Double Integer (32-Bit)
Example:
ACCU 1-H ACCU 1-L
Bit: 31 .0
Contents of ACCU 1 before execution of NEGD: 0101 1111 0110 0100 0101 1101 0011 1000
Contents of ACCU 1 after execution of NEGD: 1010 0000 1001 1011 1010 0010 1100 1000
L ID8 Load value into ACCU 1.
NEGD Generate twos complement (32-bit).
PAGE 36

NEGI Twos Complement Integer (16-Bit)
Example:
Bit 15 0
Contents of ACCU 1-L before execution of NEGI0101 1101 0011 1000
Contents of ACCU 1-L after execution of NEGI 1010 0010 1100 1000
L IW8 Load value into ACCU 1-L.
NEGI Form twos complement 16-bit.
NEGR Negate Floating-Point Number (32-Bit, IEEE-FP)
Example:
L ID8 Load value into ACCU 1 (example: ID 8 = 1.5E+02).
NEGR Negate floating-point number (32-bit, IEEE-FP); stores the result in ACCU 1.
T MD10 Transfer result to MD10 (example: result = -1.5E+02).
PAGE 37

RND Round
Example:
L MD10 Load the floating-point number into ACCU 1-L.
RND Convert the floating-point number (32-bit, IEEE-FP) into an integer (32-bit)
and
round off the result.
Value before conversion: Value after conversion:
MD10 = "100.5" => RND => MD20 = "+100"
MD10 = "-100.5" => RND => MD20 = "-100"
PAGE 38

RND+ Round to Upper Double Integer
Example:
L MD10 Load the floating-point number (32-bit, IEEE-FP) into ACCU 1-L.
RND+ Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and
round
result.Store output in ACCU 1.
MD10 = "100.5" => RND+ => MD20 = "+101"
MD10 = "-100.5" => RND+ => MD20 = "-100"
RND- Round to Lower Double Integer
Example:
RND- Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and
round
result.Store result in ACCU 1.
PAGE 39

MD10 = "100.5" => RND- => MD20 = "+100"
MD10 = "-100.5" => RND- => MD20 = "-101"
TRUNC Truncate
Example:
TRUNC Convert the floating-point number (32-bit, IEEE-FP) to an integer (32-bit) and
round
result.Store the result in ACCU 1.
MD10 = "100.5" => TRUNC => MD20 = "+100"
MD10 = "-100.5" => TRUNC => MD20 = "-100"
PAGE 40

• Counter Instructions
PAGE 41

CD Counter Down
Example:
L C#14 Counter preset value.
A I 0.1 Preset counter after detection of rising edge of I 0.1.
S C1 Load counter 1 preset if enabled.
A I 0.0 One count down per rising edge of I 0.0.
CD C1 Decrement counter C1 by 1 when RL0 transitions from 0 to 1 depending on
input
I 0.0.
AN C1 Zero detection using the C1 bit.
= Q 0.0 Q 0.0 = 1 if counter 1 value is zero.
CU Counter Up
Example:
A I 2.1 If there is a positive edge change at input I 2.1.
CU C3 Counter C3 is incremented by 1 when RL0 transitions from 0 to 1.
L Load Current Counter Value into ACCU 1
Example:
L C3 Load ACCU 1-L with the count value of counter C3 in binary format.
LC Load Current Counter Value into ACCU 1 as BCD
Example:
LC C3 Load ACCU 1-L with the count value of counter C3 in binary coded decimal
format.
R Reset Counter
Example:
A I 2.3 Check signal state at input I 2.3.
R C3 Reset counter C3 to a value of 0 if RLO transitions from 0 to 1.
S Set Counter Preset Value
Example:
L C#3 Load count value 3 into ACCU 1-L.
S C1 Set counter C1 to count value if RLO transitions from 0 to 1
PAGE 47

Data Block Instructions
Format: OPN <data block>
Example:
OPN DB10 Open data block DB10 as a shared data block.
L DBW35 Load data word 35 of the opened data block into ACCU 1-L.
T MW22 Transfer the content of ACCU 1-L into MW22.
OPN DI20 Open data block DB20 as an instance data block.
L DIB12 Load data byte 12 of the opened instance data block into ACCU 1-L.
T DBB37 Transfer the content of ACCU 1-L to data byte 37 of the opened shared data
block.
• Logic Control Instructions
JC Jump if RLO = 1
Example:
A I 1.0
A I 1.2
JC JOVR Jump if RLO=1 to jump label JOVR.
L IW8 Program scan continues here if jump is not executed.
T MW22
JOVR: A I 2.1 Program scan resumes here after jump to jump label JOVR.
JCB Jump if RLO = 1 with BR
Example:
A I 1.0
A I 1.2
JCB JOVR Jump if RLO = 1 to jump label JOVR. Copy the contents of the RLO bit
into the BR bit.
T MW22
JCN Jump if RLO = 0
Example:
A I 1.0
A I 1.2
JCN JOVR Jump if RLO = 0 to jump label JOVR.
T MW22
JM Jump if Minus
Example:
L IW8
L MW12
-I //Subtract contents of MW12 from contents of IW8.
PAGE 48
JM NEG //Jump if result < 0 (that is, contents of ACCU 1 < 0).

AN M 4.0 //Program scan continues here if jump is not executed.
S M 4.0
JU NEXT
NEG: AN M 4.1 //Program scan resumes here after jump to jump label NEG.
S M 4.1
NEXT: NOP 0 //Program scan resumes here after jump to jump label NEXT.
JMZ Jump if Minus or Zero
Example:
L IW8
L MW12
-I Subtract contents of MW12 from contents of IW8.
JMZ RGE0 Jump if result <=0 (that is, contents of ACCU 1 <= 0).
AN M 4.0 Program scan continues here if jump is not executed.
S M 4.0
JU NEXT
RGE0: AN M 4.1 Program scan resumes here after jump to jump label RGE0.
S M 4.1
NEXT: NOP 0 Program scan resumes here after jump to jump label NEXT.
JN Jump if Not Zero
Example:
L IW8
L MW12
XOW
JN NOZE Jump if the contents of ACCU 1-L are not equal to zero.
S M 4.0
JU NEXT
NOZE: AN M 4.1 Program scan resumes here after jump to jump label NOZE.
S M 4.1
JP Jump if Plus
Example:
L IW8
L MW12
JP POS Jump if result >0 (that is, ACCU 1 > 0).
S M 4.0
JU NEXT
POS: AN M 4.1 Program scan resumes here after jump to jump label POS.
S M 4.1
JPZ Jump if Plus or Zero
Example:
L IW8
PAGE 49

L MW12
JPZ REG0 Jump if result >=0 (that is, contents of ACCU 1 >= 0).
S M 4.0
JU NEXT
REG0: AN M 4.1 Program scan resumes here after jump to jump label REG0.
S M 4.1
JU Jump Unconditional
Example:
A I 1.0
A I 1.2
JC DELE Jump if RLO=1 to jump label DELE.
L MB10
INC 1
T MB10
JU FORW Jump unconditionally to jump label FORW.
DELE: L 0
T MB10
FORW: A I 2.1 Program scan resumes here after jump to jump label FORW.
JUO Jump if Unordered
Example:
L MD10
L ID2
/D Divide contents of MD10 by contents of ID2.
JUO ERRO Jump if division by zero (that is, ID2 = 0).
T MD14 Program scan continues here if jump is not executed.
A M 4.0
R M 4.0
JU NEXT
ERRO: AN M 4.0 Program scan resumes here after jump to jump label ERRO.
S M 4.0
JZ Jump if Zero
Example:
L MW10
SRW 1
JZ ZERO Jump to jump label ZERO if bit that has been shifted out = 0.
L MW2 Program scan continues here if jump is not executed.
INC 1
T MW2
JU NEXT
ZERO: L MW4 Program scan resumes here after jump to jump label ZERO.
INC 1
T MW4
PAGE 50

LOOP Loop
Example for calculating the factor of 5:
L L#1 Load the integer constant (32 bit) into ACCU 1.
T MD20 Transfer the contents from ACCU 1 into MD20 (initialization).
L 5 Load number of loop cycles into ACCU 1-L.
NEXT: T MW10 Jump label = loop start / transfer ACCU 1-L to loop counter.
L MD20
* D Multiply current contents of MD20 by the current contents of MB10.
T MD20 Transfer the multiplication result to MD20.
L MW10 Load contents of loop counter into ACCU 1.
LOOP NEXT Decr. the contents of ACCU 1 and jump to the NEXT jump label if ACCU 1-L > 0.
L MW24 Program scan resumes here after loop is finished.
L 200
>I
• Load and Transfer Instructions
L Load
L <address> loads the addressed byte, word, or double word into ACCU 1 after the old contents of
ACCU 1 have been saved into ACCU 2, and ACCU 1 is reset to "0".
Example:
L IB10 Load input byte IB10 into ACCU 1-L-L.
L MB120 Load memory byte MB120 into ACCU 1-L-L.
L DBB12 Load data byte DBB12 into ACCU 1-L-L.
L DIW15 Load instance data word DIW15 into ACCU 1-L.
L LD252 Load local data double word LD252 ACCU 1.
T Transfer
T <address> transfers (copies) the contents of ACCU 1 to the destination address if the Master
Control Relay is switched on (MCR = 1). If MCR = 0, then the destination address is written with 0.
The number of bytes copied from ACCU 1 depends on the size expressed in the destination address.
ACCU 1 also saves the data after the transfer procedure. A transfer to the direct I/O area (memory
type PQ) also transfers the contents of ACCU 1 or "0" (if MCR=0) to the corresponding address of the
process image output table (memory type Q). The instruction is executed without regard to, and
without affecting, the status bits.
Example:
T QB10 Transfers contents of ACCU 1-L-L to output byte QB10.
T MW14 Transfers contents of ACCU 1-L to memory word MW14.
T DBD2 Transfers contents of ACCU 1 to data double word DBD2.
PAGE 51

• Floating-Point Math Instructions; Basic
*R Multiply ACCU 1 and ACCU 2 as Floating Point Numbers (32-Bit IEEE-FP)
Example:
OPN DB10
L ID10 Load the value of ID10 into ACCU 1.
L MD14 Load the value of ACCU 1 into ACCU 2.Load the value of MD14 into
ACCU 1.
*R Multiply ACCU 2 and ACCU 1; store the result in ACCU 1.
T DBD25 The content of ACCU 1 (result) is transferred to DBD25 in DB10.
+R Add ACCU 1 and ACCU 2 as a Floating Point Number (32-Bit IEEE-FP)
Example:
OPN DB10
ACCU 1.
+R Add ACCU 2 and ACCU 1; store the result in ACCU 1.
-R Subtract ACCU 1 from ACCU 2 as a Floating Point Number (32-Bit IEEE-FP)
Example:
OPN DB10
ACCU 1.
-R Subtract ACCU 1 from ACCU 2; store the result in ACCU 1.
/R Divide ACCU 2 by ACCU 1 as a Floating Point Number (32-Bit IEEE-FP)
Example:
OPN DB10
L MD14 Load the contents of ACCU 1 into ACCU 2.Load the value of MD14 into
ACCU 1.
/R Divide ACCU 2 by ACCU 1; store the result in ACCU 1.
ABS Absolute Value of a Floating Point Number (32-Bit IEEE-FP)
Example:
L ID8 Load value into ACCU 1 (example: ID8 = -1.5E+02).
ABS Form the absolute value; store the result in ACCU 1.
T MD10 Transfer result to MD10 (example: result = 1.5E+02).
PAGE 52

Floating-Point Math Instructions: Extended
PAGE 53

Integer Math Instructions
+ Add Integer Constant (16, 32 Bit)
+ <integer constant> adds the integer constant to the contents of ACCU 1 and stores the result in
ACCU 1. The instruction is executed without regard to, and without affecting, the status word bits.
The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.
The contents of accumulator 3 are copied into accumulator 2, and the contents of accumulator 4 are
copied into accumulator 3 for CPUs with four ACCUs. The contents of accumulator 4 remain
unchanged.
+ <16-bit integer constant>: Adds a 16-bit integer constant (in the range of -32768 to +32767) to the
contents of ACCU 1-L and stores the result in ACCU 1-L.
unchanged.
+ <32-bit integer constant>: Adds a 32-bit integer constant (in the range of -2,147,483,648 to
2,147,483,647) to the contents of ACCU 1 and stores the result in ACCU 1.
unchanged.
Example 1:
L IW10 Load the value of IW10 into ACCU 1-L.
L MW14 Load the contents of ACCU 1-L to ACCU 2-L. Load the value of MW14 into
ACCU 1-L.
+I Add ACCU 2-L and ACCU 1-L; store the result in ACCU 1-L.
+ 25 Add ACCU 1-L and 25; store the result in ACCU 1-L.
T DB1.DBW25 Transfer the contents of ACCU 1-L (result) to DBW25 of DB1.
Example 2:
L IW12
L IW14
+ 100 Add ACCU 1-L and 100; store the result in ACCU 1-L.
>I If ACCU 2 > ACCU 1, or IW12 > (IW14 + 100)
JC NEXT then conditional jump to jump label NEXT.
Example 3:
L MD20
L MD24
+D Add ACCU 1and ACCU 2; store the result in ACCU 1.
+ L#-200 Add ACCU 1 and -200; store the result in ACCU 1.
T MD28
+D Add ACCU 1 and ACCU 2 as Double Integer (32-Bit)
Example:
L MD14 Load the contents of ACCU 1 to ACCU 2.Load the value of MD14 into
ACCU 1.
+D Add ACCU 2 and ACCU 1; store the result in ACCU 1.
T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 of DB1.
PAGE 54

-D Subtract ACCU 1 from ACCU 2 as Double Integer (32-Bit)
Example:
ACCU 1.
-D Subtract ACCU 1 from ACCU 2; store the result in ACCU 1.
T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 of DB1.
*D Multiply ACCU 1 and ACCU 2 as Double Integer (32-Bit)
Example:
L MD14 Load contents of ACCU 1 into ACCU 2.Load contents of MD14 into ACCU 1.
*D Multiply ACCU 2 and ACCU 1; store the result in ACCU 1.
T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBD25 in DB1.
/D Divide ACCU 2 by ACCU 1 as Double Integer (32-Bit)
Example:
ACCU 1.
/D Divide ACCU 2 by ACCU 1; store the result (quotient) in ACCU 1.
T MD20 The contents of ACCU 1 (result) are transferred to MD20.
Example above: 13 divided by 4
Contents of ACCU 2 before instruction (ID10): "13"
Contents of ACCU 1 before instruction (MD14): "4"
Instruction /D (ACCU 2 / ACCU 1) : "13/4"
Contents of ACCU 1 after instruction (quotient): "3"
+I Add ACCU 1 and ACCU 2 as Integer (16-Bit)
Example:
L MW14 Load the contents of ACCU 1-L into ACCU 2-L.Load the value of MW14 into
ACCU 1-L.
+I Add ACCU 2-L and ACCU 1-L; store the result in ACCU 1-L.
T DB1.DBW25 The contents of ACCU 1-L (result) are transferred to DBW25 of DB1.
-I Subtract ACCU 1 from ACCU 2 as Integer (16-Bit)
Example:
ACCU 1-L.
-I Subtract ACCU 1-L from ACCU 2-L; store the result in ACCU 1-L.
T DB1.DBW25 The contents of ACCU 1-L (result) are transferred to DBW25 of DB1.
*I Multiply ACCU 1 and ACCU 2 as Integer (16-Bit)
Example:
PAGE 55

L MW14 Load contents of ACCU 1-L into ACCU 2-L.Load contents of MW14 into
ACCU 1-
L.
*I Multiply ACCU 2-L and ACCU 1-L, store result in ACCU 1.
T DB1.DBD25 The contents of ACCU 1 (result) are transferred to DBW25 in DB1.
/I Divide ACCU 2 by ACCU 1 as Integer (16-Bit)
Example:
ACCU 1-L.
/I Divide ACCU 2-L by ACCU 1-L; store the result in ACCU 1:ACCU 1-L:
quotient,
ACCU 1-H: remainder
Example above: 13 divided by 4
Contents of ACCU 2-L before instruction (IW10):"13"
Contents of ACCU 1-L before instruction (MW14): "4"
Instruction /I (ACCU 2-L / ACCU 1-L): "13/4"
Contents of ACCU 1-L after instruction (quotient): "3"
Contents of ACCU 1-H after instruction (remainder): "1"
MOD Division Remainder Double Integer (32-Bit)
Example:
ACCU 1.
MOD Divide ACCU 2 by ACCU 1, store the result (remainder) in ACCU 1.
Example above : 13 divided by 4
Contents of ACCU 2 before instruction (ID10): "13"
Contents of ACCU 1 before instruction (MD14): "4"
Instruction MOD (ACCU 2 / ACCU 1): "13/4"
Contents of ACCU 1 after instruction (remainder): "3"
PAGE 56

Program Control Instructions
BE Block End
BE (block end) terminates the program scan in the current block and causes a jump to the block that
called the current block. The program scan resumes with the first instruction that follows the block call
statement in the calling program.
BEC Block End Conditional
If RLO = 1, then BEC (block end conditional) interrupts the program scan in the current block and
causes a jump to the block that called the current block.
Example:
A I 1.0 Update RLO.
BEC End block if RLO = 1.
L IW4 Continue here if BEC is not executed, RLO = 0.
T MW10
BEU Block End Unconditional
BEU (block end unconditional) terminates the program scan in the current block and causes a jump to
the block that called the current block. The program scan resumes with the first instruction that follows
the block call.
Example:
A I 1.0
JC NEXT Jump to NEXT jump label if RLO = 1 (I 1.0 = 1).
L IW4 Continue here if no jump is executed.
T IW10
A I 6.0
A I 6.1
S M 12.0
BEU Block end unconditional.
NEXT: NOP 0 Continue here if jump is executed.
CALL Block Call
CALL <logic block identifier> is used to call functions (FCs) or function blocks (FBs), system functions
(SFCs) or system function blocks (SFBs) you created yourself or to call the standard pre-programmed
blocks shipped by Siemens. The CALL instruction calls the FC and SFC or the FB and SFB that you
input as an address, independent of the RLO or any other condition.
Example: CALL FB1, DB1 or CALL FILLVAT1, RECIPE1
Logic Block Block Type Absolute Address Call Syntax
FC Function CALL FCn
SFC System function CALL SFCn
FB Function block CALL FBn1,DBn2
SFB System function block CALL SFBn1,DBn2
Example 1: Assigning parameters to the FC6 call
CALL FC6
Formal parameter Actual parameter
NO OF TOOL := MW100
TIME OUT := MW110
FOUND:= Q 0.1
PAGE 57

ERROR := Q 100.0
Example 2: Calling an SFC without parameters
CALL SFC43 Call SFC43 to re-trigger watchdog timer (no parameters).
Example 3: Calling FB99 with instance data block DB1
CALL FB99,DB1
MAX_RPM := #RPM1_MAX
MIN_RPM := #RPM2
MAX_POWER := #POWER
MAX_TEMP := #TEMP
Example 4: Calling FB99 with instance data block DB2
CALL FB99,DB2
MAX_RPM := #RPM3_MAX
MIN_RPM := #RPM2
MAX_POWER := #POWER1
MAX_TEMP := #TEMP
CC Conditional Call
CC <logic block identifier> (conditional block call) calls a logic block if RLO=1. CC is used to call logic
blocks of the FC or SFC type without parameters.
Example:
CC FC6 Call function FC6 if I 2.0 is "1".
A M 3.0 Executed upon return from called function (I 2.0 = 1) or directly after A I 2.0
statement if I 2.0 = 0.
UC Unconditional Call
UC <logic block identifier> (unconditional block call) calls a logic block of the FC or SFC type. UC is
like the CALL instruction, except that you cannot transfer parameters with the called block.
Example 1:
UC FC6 Call function FC6 (without parameters).
Example 2:
UC SFC43 Call system function SFC43 (without parameters).
PAGE 58

Shift Instructions
SLD Shift Left Double Word (32-Bit)
SLD <number>: The number of shifts is specified by the address <number>. The permissible value
range is from 0 to 32. The status word bits CC 0 and OV are reset to zero if <number> is greater than
zero. If <number> is equal to zero, then the shift instruction is regarded as a NOP operation.
Examples:
ACCU 1-H ACCU 1-L
Bit: 31 16 15 0
ACCU 1 before execution of SLD 5: 0101 1111 0110 0100 0101 1101 0011 1011
ACCU 1 after execution of SLD 5: 1110 1100 1000 1011 1010 0111 0110 0000
Example 1:
L MD4 Load value into ACCU 1.
SLD 5 Shift bits in ACCU 1 five places to the left.
SLW Shift Left Word (16-Bit)
SLW <number>: The number of shifts is specified by the address <number>. The permissible value
range is from 0 to 15. The status word bits CC 0 and OV are reset to zero if <number> is greater than
zero. If <number> is equal to zero, then the shift instruction is regarded as a NOP operation.
Examples:
ACCU 1-H ACCU 1-L
Bit: 31 16 15 0
ACCU 1 before execution of SLW 5: 0101 1111 0110 0100 0101 1101 0011 1011
ACCU 1 after execution of SLW 5: 0101 1111 0110 0100 1010 0111 0110 0000
Example 1:
L MW4 Load value into ACCU 1.
SLW 5 Shift the bits in ACCU 1 five places to the left.
SRD Shift Right Double Word (32-Bit)
SRD <number>: The number of shifts is specified by the address <number>. The permissible value
range is from 0 to 32. The status word bits CC 0 and OV are reset to 0 if <number> is greater thnan
zero.
Examples:
ACCU 1-H ACCU 1-L
Bit: 31 16 15 0
ACCU 1 before execution of SRD 7:0101 1111 0110 0100 0101 1101 0011 1011
ACCU 1 after execution of SRD 7: 0000 0000 1011 1110 1100 1000 1011 1010
Example 1:
L MD4 Load value into ACCU 1.
SRD 7 Shift bits in ACCU 1 seven places to the right.
SRW Shift Right Word (16-Bit)
SRW <number>: The number of shifts is specified by the address <number>. The permissible value
range is from 0 to 15. The status word bits CC 0 and OV are reset to 0 if <number> is greater than
zero.
PAGE 59

Examples:
ACCU 1-H ACCU 1-L
Bit: 31 16 15 0
ACCU 1 before execution of SRW 6: 0101 1111 0110 0100 0101 1101
0011 1011
ACCU 1 after execution of SRW 6: 0101 1111 0110 0100 0000 0001 0111
0100
Example 1:
L MW4 Load value into ACCU 1.
SRW 6 Shift bits in ACCU 1-L six places to the right.
PAGE 60

SD On-Delay Timer
SD <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed
time interval elapses as long as RLO = 1. The time is stopped if RLO transitions to "0" before the
programmed time interval has expired. This timer start instruction expects the time value and the time
base to be stored as a BCD number in ACCU 1-L.
Example:
A I 2.1
L S5T#10s Preset 10 seconds into ACCU 1.
SD T1 Start timer T1 as an on-delay timer.
PAGE 62

SE Extended Pulse Timer
SE <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed
time interval elapses, even if the RLO transitions to "0" in the meantime. The programmed time
interval is started again if RLO transitions from "0" to "1" before the programmed time has expired.
This timer start command expects the time value and the time base to be stored as a BCD number in
ACCU 1-L.
Example:
A I 2.1
SE T1 Start timer T1 as an extended pulse timer.
A I 2.2
R T1 Reset timer T1.
A T1 Check signal state of timer T1.
= Q 4.0
PAGE 64

SF Off-Delay Timer
SF <timer> starts the addressed timer when the RLO transitions from "1" to "0". The programmed
time elapses as long as RLO = 0. The time is stopped if RLO transitions to "1" before the programmed
time interval has expired. This timer start command expects the time value and the time base to be
stored as a BCD number in ACCU 1-L.
Example:
A I 2.1
SF T1 Start timer T1 as an off-delay timer.
A I 2.2
= Q 4.0
PAGE 66

SP Pulse Timer
SP <timer> starts the addressed timer when the RLO transitions from "0" to "1". The programmed
time elapses as long as RLO = 1. The timer is stopped if RLO transitions to "0" before the
programmed time interval has expired. This timer start command expects the time value and the time
base to be stored as a BCD number in ACCU 1-L.
Example:
A I 2.1
SP T1 Start timer T1 as a pulse timer.
A I 2.2
= Q 4.0
PAGE 68

SS Retentive On-Delay Timer
SS <timer> (start timer as a retentive ON timer) starts the addressed timer when the RLO transitions
from "0" to "1". The full programmed time interval elapses, even if the RLO transitions to "0" in the
meantime. The programmed time interval is re-triggered (started again) if RLO transitions from "0" to
"1" before the programmed time has expired. This timer start command expects the time value and
the time base to be stored as a BCD number in ACCU 1-L.
Example:
A I 2.1
SS T1 Start timer T1 as a retentive on-delay timer.
A I 2.2
= Q 4.0
PAGE 70

R Reset Timer
R <timer> stops the current timing function and clears the timer value and the time base of the
addressed timer word if the RLO transitions from 0 to 1.
Example:
A I 2.1
R T1 Check the signal state of input I 2.1 If RLO transitioned from 0 = 1, then reset timer
T1.
PAGE 73

Word Logic Instructions
AD AND Double Word (32-Bit)
AD (AND double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by bit
according to the Boolean logic operation AND. A bit in the result double word is "1" only when the
corresponding bits of both double words combined in the logic operation are "1".
Examples:
Bit: 31 Bit:0
ACCU 1 before execution of AD: 0101 0000 1111 1100 1000 1001 0011 1011
ACCU 2 or 32-bit constant: 1111 0011 1000 0101 0111 0110 1011 0101
Result (ACCU 1) after execution of AD:0101 0000 1000 0100 0000 0000 0011 0001
L ID20 Load contents of ID20 into ACCU 1.
L ID24 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1.
AD Combine bits from ACCU 1 with ACCU 2 by AND, store result in ACCU 1.
AW AND Word (16-Bit)
AW (AND word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit
according to the Boolean logic operation AND. A bit in the result word is "1" only when the
corresponding bits of both words combined in the logic operation are "1".
Examples:
Bit: 15 Bit:0
ACCU 1-L before execution of AW: 0101 1001 0011 1011
ACCU 2-L or 16-bit constant: 1111 0110 1011 0101
Result (ACCU 1-L) after execution of AW: 0101 0000 0011 0001
L IW20 Load contents of IW20 into ACCU 1-L.
L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of IW22 into ACCU 1-L.
AW Combine bits from ACCU 1-L with ACCU 2-L bits by AND; store result in ACCU 1-L.
T MW 8 Transfer result to MW8.
OD OR Double Word (32-Bit)
OD (OR double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by bit
according to the Boolean logic operation OR. A bit in the result double word is "1" when at least one of
the corresponding bits of both double words combined in the logic operation is "1".
Examples:
Bit: 31 Bit:0
ACCU 1 before execution of OD: 0101 0000 1111 1100 1000 0101 0011 1011
Result (ACCU 1) after execution of OD:1111 0011 1111 1101 1111 0111 1011 1111
OD Combine bits from ACCU 1 with ACCU 2 bits by OR; store result in ACCU 1.
OW OR Word (16-Bit)
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OW (OR word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit
according to the Boolean logic operation OR. A bit in the result word is "1" when at least one of the
corresponding bits of both words combined in the logic operation is "1".
Examples:
Bit: 15 Bit:0
ACCU 1-L before execution of OW: 0101 0101 0011 1011
ACCU 2-L or 16 bit constant: 1111 0110 1011 0101
Result (ACCU 1-L) after execution of OW: 1111 0111 1011 1111
L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of IW22 into ACCU 1-L.
OW Combine bits from ACCU 1-L with ACCU 2-L by OR, store result in ACCU 1-L.
XOD Exclusive OR Double Word (32-Bit)
XOD (XOR double word) combines the contents of ACCU 1 with ACCU 2 or a 32-bit constant bit by
bit according to the Boolean logic operation XOR (Exclusive Or). A bit in the result double word is "1"
when only one of the corresponding bits of both double words combined in the logic operation is "1".
Examples:
Bit: 31 Bit:0
ACCU 1 before execution of XOD: 0101 0000 1111 1100 1000 0101 0011 1011
Result (ACCU 1) after execution of OD:1010 0011 0111 1001 1111 0011 1000 1110
XOD Combine bits from ACCU 1 with ACCU 2 by XOR; store result in ACCU 1.
XOW Exclusive OR Word (16-Bit)
XOW (XOR word) combines the contents of ACCU 1-L with ACCU 2-L or a 16 bit-constant bit by bit
according to the Boolean logic operation XOR. A bit in the result word is "1" only when one of the
corresponding bits of both words combined in the logic operation is "1".
Examples:
Bit: 15 Bit:0
ACCU 1 before execution of XOW: 0101 0101 0011 1011
ACCU 2-L or 16-bit constant: 1111 0110 1011 0101
Result (ACCU 1) after execution of XOW: 1010 0011 1000 1110
L IW22 Load contents of ACCU 1 into ACCU 2.Load contents of ID24 into ACCU 1-L.
XOW Combine bits of ACCU 1-L with ACCU 2-L bits by XOR, store result in ACCU 1-L.
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Accumulator Instructions
DEC Decrement ACCU 1-L-L
Example:
L MB250 Load the value of MB250
DEC 1 Instruction "Decrement ACCU 1-L-L by 1"; store result in ACCU 1-L-L.
T MB250 Transfer the contents of ACCU 1-L-L (result) back to MB250.
INC Increment ACCU 1-L-L
Example:
L MB22 Load the value of MB22
INC 1 Instruction "Increment ACCU 1 (MB22) by 1"; store result in ACCU 1-L-L
T MB22 Transfer the contents of ACCU 1-L-L (result) back to MB22
TAK Toggle ACCU 1 with ACCU 2
Example:
Subtract smaller value from greater value:
Example:
L MW10 Load contents of MW10 into ACCU 1-L.
L MW12 Load contents of ACCU 1-L into ACCU 2-L.Load contents of MW12
into ACCU 1-
>I Check if ACCU 2-L (MW10) greater than ACCU 1-L (MW12).
JC NEXT Jump to NEXT jump label if ACCU 2 (MW10) is greater than ACCU 1
(MW12).
TAK Swap contents ACCU 1 and ACCU 2
NEXT: -I Subtract contents of ACCU 2-L from contents of ACCU 1-L.
T MW14 Transfer result (= greater value minus smaller value) to MW14.
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AUTOMATION & CONTROL SYTEMS PAGE 85
MUMBAI-64 TEL.: 022-8883737
AUTOMATION & CONTROL SYTEMS PAGE 85
MUMBAI-64 TEL.: 022-8883737

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PAGE 98

Siemens s7 300 programming

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Siemens s7 300 programming