Profibus Dp Interface Module Users Manual Qj71 Pb92 D Sh Na 0

PROFIBUS-DP Interface Module
User's Manual

Mitsubishi Programmable
Logic Controller

QJ71PB92D

• SAFETY PRECAUTIONS •
(Read these precautions before using.)

Before using this product, please read this manual and the relevant manuals introduced in this manual
carefully and pay full attention to safety to handle the product correctly.
The instructions given in this manual are concerned with this product. For the safety instructions of the
programmable controller system, please read the CPU module user's manual.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".

Indicates that incorrect handling may cause hazardous conditions,
! DANGER resulting in death or severe injury.

Indicates that incorrect handling may cause hazardous conditions,
! CAUTION resulting in medium or slight personal injury or physical damage.

Note that the ! CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.

Please save this manual to make it accessible when required and always forward it to the end user.

[DESIGN PRECAUTIONS]
! DANGER
• When a communication error occurs in the PROFIBUS network, the status of the faulty station is
as follows. Configure an interlock circuit in the sequence program using the communication
status information (input X1, buffer memory 2040 to 2079) so that the system can operate
safely.
Erroneous outputs and mis-operation could cause accidents.
(1) The input data of the master station maintains the data before abnormality of the
communication.
(2) When the master station is down, the output state of each slave station will be in
accordance with the parameter settings.
(3) When any slave station is down, the output state of other slave stations will be in
accordance with the parameter settings of the master station.
• Do not output the "prohibited to use" signal as the output signal to an intelligent function module
from the PLC CPU.
Writing data into the "system area" or outputting a signal for "prohibited to use" may cause
system malfunction in the PLC.

! CAUTION
• When the PROFIBUS cable is laid, do not lay it close to main circuits or power lines.
They should be installed 100mm(3.9inch) or more from each other.
Not doing so could result in noise that would cause malfunctioning.

A-1 A-1

[INSTALLATION PRECAUTIONS]
! CAUTION
• Use the PLC in an environment that meets the general specifications contained in the CPU
user's manual.
Using this PLC in an environment outside the range of the general specifications may cause
electric shock, fire, malfunction, and damage to or deterioration of the product.
• When installing the module, securely insert the module fixing tabs into the mounting holes of the
base module while pressing the installation lever located at the bottom of the module downward.
Improper installation may result in malfunction, breakdown or the module coming loose and
dropping. Securely fix the module with screws if it is subject to vibration during use.
• Tighten the screws within the range of specified torque.
If the screws are loose, it may cause the module to fallout, short circuits, or malfunction.
If the screws are tightened too much, it may cause damage to the screw and/or the module,
resulting in fallout, short circuits or malfunction.
• Switch all phases of the external power supply off when mounting or removing the module.
Not ding so may cause electric shock or damage to the module.
• Do not touch the conductive area or electric parts of the module.
Doing so may cause module malfunctioning or breakdowns.

[WIRING PRECAUTIONS]
! CAUTION
• Switch all phases of the external power supply of the PLC system off before connecting the
PROFIBUS cable. If you not switch off the external power supply, it will cause failure or
malfunction of the module.
• Be careful not to let foreign matter such as filings or wire chips get inside the module. These can
cause fire, breakdowns and malfunctioning.
• The PROFIBUS cable which is connected to the module must be protected with a duct or
secured in position with clamps.
Unless the cable is thus protected or secured, the module or the cable could be damaged when
the cable swings, moves or it is strained with careless pulls, or it could cause malfunction when
the cable contacts with any undesirable objects.
• When disconnecting the PROFIBUS cable from the module, do not pull by holding the cable
section. To disconnect the cable, make sure to hold the connector which is coupled with the
module. Do not attempt to pull the cable to disconnect it from the module. It could damage the
module or the cable, or cause malfunction due to a poor contact of the cable.
• Be sure to fix communication cables or power supply cables leading from the module by placing
them in the duct or clamping them.
Cables not placed in the duct or without clamping may hang or shift, allowing them to be
accidentally pulled, which may cause a module malfunction and cable damage.

A-2 A-2

[STARTING AND MAINTENANCE PRECAUTIONS]
! DANGER
• Switch all phases of the external power supply off before cleaning.
Not doing so could cause electric shock.

! CAUTION
• Never disassemble or modify the module.
This may cause breakdowns, malfunctioning, injury and/or fire.
• Switch all phases of the external power supply off before mounting or removing the module. If
you do not switch off the external power supply, it will cause breakdowns or malfunction of the
module.
• Set the ON/OFF select switch of the terminal resistor before the operation.
If the setting is switched during the operation, network error may occur, or error detection may
not be performed by error.

[DISPOSAL PRECAUTIONS]
! CAUTION
• When disposing of this product, treat it as industrial waste.

A-3 A-3

REVISIONS
* The manual number is given on the bottom left of the back cover.
Print Date * Manual Number Revision
Dec., 2000 SH (NA) 080127-A First printing
May, 2001 SH (NA) 080127-B Corrections
About the Generic Terms and Abbreviations, Section 2.1, 2.4, 4.1.3,
4.1.4, 5.1, 5.1.1, 5.4, 8.1, 8.2

Japanese Manual Version SH-080126-A

This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent
licenses. Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property
rights which may occur as a result of using the contents noted in this manual.
 2000 MITSUBISHI ELECTRIC CORPORATION

A-4 A-4

INTRODUCTION

Thank you for purchasing the Mitsubishi Programmable Controller MELSEC-Q Series.
Before using the equipment, plese read this manual carefully to develop full familiarity with the functions and
performance of the graphic operation terminal you have purchased, so as to ensure correct use.
Please forward a copy of this manual to the end user.

CONTENTS
SAFETY PRECAUTIONS.............................................................................................................................A - 1
REVISIONS ...................................................................................................................................................A - 4
INTRODUCTION...........................................................................................................................................A - 5
CONTENTS...................................................................................................................................................A - 5
About Manuals ..............................................................................................................................................A - 7
Conformation to the EMC Directive and Low Voltage Instruction ...............................................................A - 8
About the Generic Terms and Abbreviations ...............................................................................................A - 8
Product Structure ..........................................................................................................................................A - 8

1. OVERVIEW 1- 1 to 1- 2

1.1 Software Configuration ........................................................................................................................... 1- 1
1.2 QJ71PB92D Features............................................................................................................................ 1- 2

2. SYSTEM CONFIGURATION 2- 1 to 2- 4

2.1 Adaptive System ..................................................................................................................................... 2- 1
2.2 When Used in Multi-CPU System .......................................................................................................... 2- 2
2.3 Precautions for Configuring a System.................................................................................................... 2- 3
2.4 Confirmation of Serial No........................................................................................................................ 2- 4

3. SPECIFICATIONS 3- 1 to 3- 35

3.1 Performance Specifications .................................................................................................................... 3- 1
3.2 Network Configuration ............................................................................................................................ 3- 2
3.2.1 Basic configuration ........................................................................................................................... 3- 2
3.2.2 Applicable configuration................................................................................................................... 3- 3
3.2.3 Number of connectable slaves ........................................................................................................ 3- 7
3.3 I/O Signal................................................................................................................................................. 3- 9
3.3.1 I/O signal list ..................................................................................................................................... 3- 9
3.3.2 I/O signal detail description.............................................................................................................. 3-10
3.4 Buffer Memory List .................................................................................................................................. 3-14
3.4.1 Buffer memory/configuration............................................................................................................ 3-14
3.4.2 Buffer memory detailed description ................................................................................................. 3-15

4. FUNCTIONS 4- 1 to 4- 13

4.1 Functions for Exchanging with Slaves.................................................................................................... 4- 1
4.1.1 Exchange flow .................................................................................................................................. 4- 2
4.1.2 Global control functions.................................................................................................................... 4- 3
4.1.3 Word data swap function ................................................................................................................. 4- 6
4.1.4 I/O data separation prevention function .......................................................................................... 4- 8

A-5 A-5

4.2 Operation Mode ...................................................................................................................................... 4-11
4.2.1 Normal service mode (MODE 0) ..................................................................................................... 4-12
4.2.2 Extended service mode (MODE E) ................................................................................................. 4-13

5. PROCEDURES BEFORE SYSTEM OPERATION 5- 1 to 5- 12

5.1 Procedures before Operation ................................................................................................................. 5- 1
5.1.1 Parameter setting procedure ........................................................................................................... 5- 2
5.2 Installation ............................................................................................................................................... 5- 6
5.2.1 Handling precautions ....................................................................................................................... 5- 6
5.2.2 Installation environment ................................................................................................................... 5- 6
5.3 Part Names and Settings........................................................................................................................ 5- 7
5.4 Execution Method for Self-diagnosis...................................................................................................... 5- 9
5.5 Wiring....................................................................................................................................................... 5-10
5.5.1 PROFIBUS cable wiring................................................................................................................... 5-10
5.5.2 Terminator switch ............................................................................................................................. 5-10
5.5.3 Precautions against wiring ............................................................................................................... 5-11
5.6 Maintenance and Inspection................................................................................................................... 5-12

6. COMMUNICATION TIME 6- 1 to 6- 4

6.1 Bus Cycle Time ....................................................................................................................................... 6- 1
6.2 Transmission Delay Time ....................................................................................................................... 6- 4

7. PROGRAMMING 7- 1 to 7- 18

7.1 Communication Using Automatic Refresh Setting................................................................................. 7- 1
7.2 Normal Service Mode (MODE 0) Using FROM/TO Instruction............................................................. 7- 9
7.3 Extended Service Mode (MODE E) Using FROM/TO Instruction......................................................... 7-12
7.4 Normal Service Mode (MODE 0) Using Dedicated Instruction ............................................................. 7-15
7.5 Execution of Global Control .................................................................................................................... 7-18

8. DEDICATED INSTRUCTIONS 8- 1 to 8- 2

8.1 BBLKRD Instruction ................................................................................................................................ 8- 1
8.2 BBLKWR Instruction ............................................................................................................................... 8- 2

9. TROUBLESHOOTING 9- 1 to 9- 2

APPENDIX Appendix - 1 to Appendix - 4

Appendix 1 Differences between QJ71PB92D and AJ71PB92D/A1SJ71PB92D.........................Appendix - 1
Appendix 2 Extended Trouble Information of Mitsubishi's Slaves..................................................Appendix - 2
Appendix 3 Outline Drawings ..........................................................................................................Appendix - 3

INDEX Index 1

A-6 A-6

About Manuals

The following are manuals related to this product.
Request for the manuals as needed according to the chart below.

Related Manuals

Manual Name Manual Number
MELSoft GX Configurator-DP 4.00 Configuration System for Open Networks
IB-65778
Software Manual

Inquiries can be made to :
MITSUBISHI ELECTRIC EUROPE Factory Automation
Gothaer Strasse 8 D-40880 Ratingen Germany
Phone : +49(21 02)486-0
Fax : +49(21 02)486-717

A-7 A-7

Conformation to the EMC Directive and Low Voltage Instruction

For details on making Mitsubishi PLC conform to the EMC directive and low voltage
instruction when installing it in your product, please see Chapter 3, "EMC Directive
and Low Voltage Instruction" of the PLC CPU User’s Manual (Hardware).
The CE logo is printed on the rating plate on the main body of the PLC that conforms
to the EMC directive and low voltage instruction.

About the Generic Terms and Abbreviations

Unless otherwise specified, this manual uses the following generic terms and
abbreviations to describe the Type QJ71PB92D PROFIBUS-DP interface module.

Generic Term/Abbreviation Description of the abbreviation/general terms
QJ71PB92D Abbreviated name of Type QJ71PB92D PROFIBUS-DP interface module
QCPU (Q mode) Generic name of MELSEC-Q series PLC CPU module compatible with QJ71PB92D
Generic name of MELSEC-Q series main base unit and extension base unit
Base unit
compatible with QJ71PB92D
GX Configrator-DP Abbreviated name of configurator for PROFIBUS-DP
PROFIBUS Abbreviated name of PROFIBUS-DP network
Abbreviated name of master station (class 1) (master device) inside PROFIBUS-DP
Master station
network
Slave station Abbreviated name of slave station (slave device) inside PROFIBUS-DP network
Peripheral device Generic name of personal computer capable of using GX Configuration-DP

Product Structure

The product structure of this product is given in the table below.

Model Product Name Quantity
QJ71PB92D Type QJ71PB92D PROFIBUS-DP interface module 1

A-8 A-8

1 OVERVIEW
MELSEC-Q

1. OVERVIEW

This is the user's manual for the QJ71PB92D PROFIBUS-DP interface module
1
(hereafter abbreviated as " QJ71PB92D. When explain separately, however,
abbreviated as QJ71PB92D), which is used to connect a MELSEC-Q series
programmable controller to a PROFIBUS-DP network.
The QJ71PB92D operates as a master station (class 1) in the PROFIBUS-DP network.

1.1 Software Configuration

MELSEC Q Series PC

Automatic refresh,
FROM/TO,
Dedicated instruction

Portion where master
PCB is installed Communication using a buffer memory

User Interface

Direct Data Link Mapper
(DDLM)
Portion where slave
PCB is installed
empty Layer 3 to 7

FDL Layer 2 Datalink layer
FMA1/2
PHY Layer 1 Physical layer

The QJ71PB92D has a physical layer, data link layer, DDLM, and user interface that
conform to PROFIBUS-DP, and communicates data with the PLC CPU by using a
buffer memory.
The main application of PROFIBUS-DP is networks that execute high-speed
communication at the level of sensors and actuators.

1-1 1-1

1 OVERVIEW
MELSEC-Q

1.2 QJ71PB92D Features

1 (1) Operates as a PROFIBUS-DP master (class 1) station.

(2) Makes possible the exchange of input and output data to and from the slave
station without the need to be aware of the PROFIBUS-DP protocol by using I/O
signals X/Y and the buffer memory.

(3) Supports 3M, 6M, 12M [bps] network communication speeds in addition to the
9.6k, 19.2k, 93.75k, 187.5k, 500k, and 1,500k [bps] supported by the
QJ71PB92D. These can be selected using a configurator.

(4) Trouble information can be read from the slave station using the I/O signal X/Y
and the buffer memory.

(5) The global control function makes it possible to maintain all slave I/O at the same
time. In addition, this can also be canceled.

(6) The module contains a self-diagnosis function that can be used to test the
hardware such as the internal memory.

(7) The upper and lower bytes of I/O data can be swapped on the buffer memory.
When word data is handled, these bytes need not be swapped using the
sequence program.

(8) For data transmission between the PLC CPU and buffer memory of QJ71PB92D,
the automatic refresh setting and dedicated instruction are used to prevent I/O
data from being separated .
: The data of specified sizes are not matched with each other.

(9) Even when a plurality of PLC CPU modules are installed through the multi-CPU
system, this model can be controlled by any PLC CPU module.

1-2 1-2

2 SYSTEM CONFIGURATION
MELSEC-Q

2. SYSTEM CONFIGURATION

This chapter describes the system configuration of QJ71PB92D.

2.1 Adaptive System

The modules and software programs used on QJ71PB92D are shown below. 2

(1) Adaptive CPU modules
ApplicableIn Inapplicable
1
Q02CPU* Q00JCPU
Q02HCPU*1 Q00CPU
Q06HCPU*1 Q01CPU
Q12HCPU*1
Q25HCPU*1
1: The separation prevention function using dedicated instruction or automatic refresh
setting cannot be used on those products with serial No. 02092
and subsequent.

(2) Mountable base units
Mountable base unit
Main base unit Extension base unit
Q33B, Q35B, Q38B, Q312B Q63B, Q65B, Q68B, Q612B,Q52B*2,Q55B*2
2: When using the Q52B/Q55B, calculate the operating voltage of the Q52B/Q55B and
check that it is within the specified range. Refer to the QCPU (Q Mode) User's
Manual (Hardware Design, Maintenance and Inspection) for the calculation
expression, and to the Data Book for the current consumption of each module
installed on the base unit.

(3) Essential configurator software
Essential configurator software
GX Configrator-DP

POINT
Do not use the separation prevention function in CPU modules which do not
support this function or incorrect I/O data will result.

2-1 2-1

MELSEC-Q

2.2 When Used in Multi-CPU System

When using QJ71PB92D in the multi-CPU system, take care of the following.
The control of QJ71PB92D is performed by any CPU.

A total of merely 64 sheets of QJ71PB92D is installed for each system. It is not the
2 mountable number of sheets for each controlled CPU, but the total number of sheets
controlled by all CPUs.

CPU CPU CPU CPU
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4

13 14 15 16 17 18 19 20 21 22 23 24

61 62 63 64 65

2-2 2-2

MELSEC-Q

2.3 Precautions for Configuring a System

(1) The following configuration software programs cannot be used on QJ71PB92D.
SW05F-PROFIMAP
MELSEC-PROFIMAP 1.0
MELSEC-PROFIMAP 2.0
MELSEC-PROFIMAP 3.0

(2) The separation prevention function can be used only on those products having
QCPU (Q mode) with serial No. 02092 and subsequent.
If this function is used on products that do not support it, incorrect I/O data will
result.

(3) When performing the following operations, ensure that the module READY signal
X1D of QJ71PB92D is turned ON beforehand.
To switch over the operation mode with Y11/X11, using the sequence program.
To set parameters.
If the status of X1D is ignored and data is read from or written in the buffer
memory, the CPU module may detect an error to stop the sequence calculation.

(4) Do not write parameters in QJ71PB92D simultaneously from a plurality of GX
Configurator-DPs.
The parameter values of QJ71PB92D will become incorrect ones.

(5) If remote parameter setting is performed from GX Configrator-DP to the
QJ71PB92D which is making data exchange, note that PROFIBUS data
exchange will stop during parameter setting.

(6) When setting parameters in GX Configurator-DPs, do not perform the mode
selection using a program.
The parameter setting or mode selection may not be performed correctly.

(7) Combination with MELSECNET/H
QJ71PB92D can be mounted on the MELSECNET/H administrative station and
general stations, but cannot be mounted on MELSECNET/H remote stations.

2-3 2-3

MELSEC-Q

2.4 Confirmation of Serial No.

The serial Nos. of QCPUs (Q mode) capable of using the separation prevention
function of QJ71PB92D and their confirmation method are shown below.

(1) Serial Nos. of QCPUs (Q mode) capable of using the separation prevention
function
Products with serial No. 02092 and subsequent

(2) Confirmation of serial Nos. of Q-series PLC
(a) When confirming on the Rating indication plate on the side surface of the
module
The serial No. of the applicable module is given in SERIAL column of the
Rating indication plate.

Serial No. (Upper 5 digits)
Function version

(b) When confirming on GX Developer
The method for confirming the serial No. of the applicable module on GX
Developer is shown for the case using GX Developer Version 6. The serial
No. appears in the [Product information list] or [Module detail information]
window of GX Developer. The method of confirming the serial No. on the
Production information list window is shown below.

[Start Procedure]
"Diagnosis" "System monitor" "Product information list"

[Serial No.]
The serial No. of the applicable module appears in the Serial No. field.
2-4 2-4

3 SPECIFICATIONS
MELSEC-Q

3. SPECIFICATIONS

This section explains the QJ71PB92D the general specifications, performance
specifications, and transmission specifications.
For the general specifications of the QJ71PB92D, refer to the user’s manual for the
CPU module to be used.

3.1 Performance Specifications

Item Specifications
Model QJ71PB92D 3
PROFIBUS-DP station type Master station (class 1)
Electrical standards and characteristics Complies with EIA-RS485
Medium Shielded twisted cable
Network configuration Bus (however, tree type when a repeater is used)
Data link method Token passing method (Master-to-master)
Polling method (Master-to-slave)
Transmission encoding method NRZ
Maximum transmission distance
Transmission speed Transmission distance [m/segment]
when 3 repeaters are used
9.6 [kbps]
Transmission specifications

19.2 [kbps] 1200 4800
Transmission speed/maximum 93.75 [kbps]
transmission distance 1 2 187.5 [kbps] 1000 4000
500 [kbps] 400 1600
1500 [kbps] 200 800
3 [Mbps]
6 [Mbps] 100 400
12 [Mbps]
Maximum number of repeaters/network 3 units 2
Maximum number of stations/segment 32 stations 3
Maximum number of slave
60 slaves 3
stations/master station
Number of connection nodes (number of
32, 62 (1), 92 (2), 126 (3) 3
repeaters)
32 bytes/1 station (Normal service mode)
Transmittable data
244 bytes/1 station (Extended service mode)
Number of occupied I/O 32 points (I/O assignment : 32 Intelligent points)
5VDC Internal power consumption (A) 0.57
External dimensions (mm) 105(H) × 27.4(W) × 975(D)
Weight (kg) 0.15
1 Transmission speed control within +/- 0.3% (PROFIBUS part 1)
2 Distance that the transmission distance can be expanded by (m/network) using repeaters
Transmission distance (m/network) = (number of repeaters + 1) × transmission distance (m/segment)
3 When a slave used is greater than 32 bytes in the maximum data length of the error information, the maximum number of stations, the
maximum number of slave stations and the number of connection nodes may be less than the above values.
This is because the maximum data length of the slave station error information that the QJ71PB92D can receive varies with the
minimum station number and maximum station number of the slave stations set in the parameters. Refer to Section 3.2.3 for details.
For the noise immunity, withstand voltage, insulation resistance and others in the PLC system using this
module, refer to the power supply module specifications given in the used CPU module user’s manual.

3-1 3-1

3 SPECIFICATIONS
MELSEC-Q

3.2 Network Configuration

3.2.1 Basic configuration

1) Equipment types
Class 1 master
GX Configurator-DP
Slave
Repeater
2) Number of units that can be connected to the entire network (when repeaters are
3 used)
Master+slave ≤ 126 units
3) Number that can be connected for 1 segment
Master+slave+repeaters ≤ 32 units
4) Communications can be conducted via a maximum of 3 repeaters from an arbitrary
master or arbitrary slave to an arbitrary master or arbitrary slave (Not 3 units in the
entire network).
5) The maximum number of slaves that can be connected to 1 QJ71PB92D is 60
stations.
Master (class 1)
QJ71PB92D
CPU module
GX Configurator-DP

Slave Slave Slave

The PROFIBUS-DP cable is provided by the user.

3-2 3-2

3 SPECIFICATIONS
MELSEC-Q

3.2.2 Applicable configuration

1) When 1 master (class 1) station is connected
Master (class 1)
QJ71PB92D
CPU mlodule
GX Configurator-DP

Slave Slave Slave
Station No. 1 Station No. 2 Station No. 31

A maximum of 32 stations can be connected to 1 segment.

2) When 1 master (class 1) station and 1 repeater are connected
Master (class 1)
QJ71PB92D
CPU module
GX Configurator-DP

Repeater
Slave Slave Slave

Slave Slave Slave

In the above configuration a maximum of 60 slaves can be connected.

3-3 3-3

3 SPECIFICATIONS
MELSEC-Q

3) When 1 master (class 1) station and 3 repeaters are connected
Master (class 1)
QJ71PB92D
CPU module
GX Configurator-DP

Repeater
Slave Slave Slave

Repeater Slave Slave
Station No. 19 Station No. 35

Repeater
Slave Slave

Slave Slave

In the above configuration a maximum of 60 slaves can be connected. The
difference between this configuration and the one in 2) is that the possible
communication distance can be extended.

3-4 3-4

3 SPECIFICATIONS
MELSEC-Q

4) When 126 master (class 1) and slave stations are connected
(When 60 or more slaves are connected)
2nd master
1st master
(class 1)
(class 1)
CPU module 3rd master
(class 1)

Repeater
Slave Slave Slave Slave
Station No. 1 Station No. 14 Station No. 15 Station No. 18

Repeater
Slave Slave

Repeater Repeater
Slave Slave

Slave Slave Slave Slave
Station No. 86 Station No. 107 Station No. 108 Station No. 123

: This slave is controlled by the 1st master (class 1).

: This slave is controlled by the 2nd master (class 1).

: This slave is controlled by the 3rd master (class 1).

In the above configuration a maximum of 123 slave stations can be connected.
3-5 3-5

3 SPECIFICATIONS
MELSEC-Q

POINT
In configurations that use multiple master stations (multimaster configuration),
when reconnecting a cable after disconnecting a PROFIBUS cable for 1 master
that is exchanging data at a low baud rate, the communications of the master for
which the cable is not disconnected could stop and the slave output could be
turned off. To prevent this, the master PROFIBUS cable must be secured with a
screw.
In addition, there is a high possibility that the above phenomena can be avoided if
care is taken with the following points when configuring a system.
(1) Set the slave watchdog timer setting value to larger than (TTr × G)/BR.
However,
TTr : Target token rotation time (Unit: Bit Time)
G: Gap update factor
BR : Baud rate (Unit: bps)
(2) Use a high baud rate.
(3) The HSA (Highest Station Address) value is made to match the maximum
station No. that is actually connected.

3-6 3-6

3 SPECIFICATIONS
MELSEC-Q

3.2.3 Number of connectable slaves

Please calculate the number of the slave which can be connected under the following
(1) and (2) conditions.

(1) The maximum data length of the slave station error information that
the QJ71PB92D can receive varies with the minimum station
number and maximum station number of the slave stations set in
the parameters, and can be calculated using the following
expression.
Maximum data length of receivable error information (bytes) =
MIN(12600/N - 10, 244)
a b
Provided that:

N = MIN((slave station's maximum station number -
slave station's minimum station number + 1) × 5, 300)
a b
MIN(a, b) = smaller of a and b

If the maximum data length (Max_Diag_Data_Len) of the error information
described in the GSD file of a slave station is greater than the value calculated by
the above expression, normal communication may not be made with that slave
station.
If normal communication cannot be made, try the following methods:
(a) Set the station numbers of the slave stations with no unused numbers in
between.

(b) Make setting on the slave station side to shorten the maximum data length of
the error information. (If possible)

(c) Using two or more QJ71PB92D's, reduce the number of slave stations per
module.

(2) Relation between parameter size and the number of system
construction
The parameter size which can be set in QJ71PB92D should meet the following
formula.
Note that the system construction which does not meet the following formula
causes the error of 1302H.

[5+ (number of parameter blocks for each station)] 128

(Number of parameter blocks for each station) is the sum total of the numbers
of parameter blocks calculated by the station.

3-7 3-7

3 SPECIFICATIONS
MELSEC-Q

The number of parameter blocks for each station is decided by the parameter
size of the station as follows.
Parameter size Number of block
246 bytes or less 1 block
247 to 480 bytes 4 blocks

The parameter size is calculated by using the following formula.
Parameter size =31+ user_Param data length + number of setting module +

(a) Uer_Param data length
Value of Max _ User _ Data size on the screen displayed after selecting the
Select Module on setting screen of the slave station of GX Configuratior-DP

(b)Setting number of modules
Modular type : Value of Modules installed on the screen displayed after
selecting the Select Module on setting screen of the slave
station of GX Configuratior-DP

Block type : Value of Module in GSD file

(c) (constant)
= 2 : When there is either input module or output module
= 4 : When there is both input module and output module

(example)
When the system is constructed using only the stave stations with 520 bytes
parameter, QJ71PB92D can connect with up to the following number of the slave
stations.
When the parameter size is 520 bytes, the number of the parameter block is five
blocks.
5 + (5 n) 128 : n = number of slaves

n (128 - 5) / 5 = 24.6

n = 24

The calculation mentioned above tells that QJ71PB92D can connect with up to
24 slave stations.
Therefore, when 25 slave bureau or more are set by the parameter, QJ71PB92D
detects the error of 1302H.

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3.3 I/O Signal

3.3.1 I/O signal list

The I/O signal configuration used in the QJ71PB92D and the data communications
with the PLC CPU are described below.

Signal direction: QJ71PB92D PLC CPU Signal direction: PLC CPU QJ71PB92D
Device No. Description Device No. Description
X00 Exchange start end signal Y00 Exchange start request signal
X01 Communication trouble detection signal Y01 Communication trouble detection signal reset
X02 Communication trouble area clear end signal Y02 Communication trouble area clear request signal
X03 Not usable Y03 Communication trouble area type selection
X04 Global control end signal Y04 Global control request signal
X05 Global control error end Y05

……
X06 Not usable
……………

Y0B
Y0C Dedicated instruction valid signal
Not usable
Y0D Startup request signal
Y0E
…

X0F Not usable
X10 Operation mode signal Y10
X11 Operation mode change completion signal Y11 Operation mode change request signal
X12 Y12
…

Not usable
………………

X1A
X1B Communication READY signal
Not usable
X1C Not usable
X1D Module READY signal
X1E Not usable
X1F Watchdog timer error signal Y1F

POINT
If a device which is not usable is accidentally turned on and off in the sequence
program, it cannot guarantee as the QJ71PB92D function.

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3.3.2 I/O signal detail description

(1) Exchange start request signal (Y00), exchange start end signal
(X00)
(a) After the exchange start request signal (Y00) is turned on by the sequence
program the exchange start end signal (X00) is turned on when cyclic
exchange starts.

(b) When the exchange start request signal (Y00) is turned off by the sequence
program or when an error occurs that stops the exchange, the exchange start
end signal (X00) turns off.
Maximum 200 ms
Exchange start
request
Exchange start request signal (Y00)
Exchange start end
Exchange start end signal (X00)

Exchange

(c) An interlock is used for FROM/TO of the I/O data.

(d) Before the exchange start request signal is turned on the output data initial
value must be written to the buffer memory.

(2) Communication trouble detection signal (X01), communication
trouble detection signal reset (Y01)
(a) The communication trouble detection signal (X01) is turned on when a
communication trouble occurs. At the same time the RSP ERR.'s LED turns
on. At this time the error code and detailed data are stored in the buffer
memory communication trouble area.

(b) The communication trouble detection signal (X01) is turned off when the
communication trouble detection signal reset (Y01) is turned on from the
sequence program. At this time the RSP ERR.'s LED is turned off.

(c) The communication trouble detection signal reset (Y01) is turned off by the
sequence program after it has been confirmed that the communication
trouble detection signal (X01) has been turned off.

(d) The following sequence is used.

Trouble detection reset
Communication trouble detection signal reset (Y01)
Trouble detection
Communication trouble detection signal (X01)

FROM/TO FROM

The error code is read from the buffer memory to the PLC CPU.

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(3) Communication trouble area clear request (Y02), communication
trouble area clear end (X02)
(a) The communication trouble area clear request (Y02) is turned on by the
sequence program when all of the communication trouble areas and
extension trouble areas are cleared.
(b) The communication trouble clear end signal (X02) is turned on after all of the
communication trouble area and extension trouble areas are cleared by
turning on the communication trouble area clear request signal (Y02).
(c) The communication trouble area clear request (Y02) is turned off by the
sequence program after it has been confirmed that the communication
trouble area clear end signal (X02) has been turned on.
(e) When the communication trouble area clear request signal (Y02) is turned off
the communication trouble area clear end signal is turned off.
(d) A sequence like the one below is used.
Clear request
Communication trouble area clear request (Y02)

Clear end
Communication troublev area clear end (X02)

(4) Global control request signal (Y04), global control end signal (X04)
(a) The global control end signal (X04) is turned on after service processing has
ended when the global control request signal (Y04) is turned on by the
sequence program.
(b) The global control request signal (Y04) is turned off by the sequence program
after it has been confirmed that the global control service end signal (X04)
has turned on.
(c) When the global control request signal (Y04) is turned off the global control
end signal (X04) turns off.
(d) The global control request signal (Y04) cannot be received if the exchange
starting (X00) is not on. If Y04 is turned on when X00 is off then both X04 and
X05 will turn on.
(e) A sequence like the one below is used.
X00
Exchange start end signal (X00)
Global control request
Global control request signal (Y04)

Global control end
Global control end signal (X04)

TO

Output data write

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(5) Global control error end signal (X05)
(a) If global control is requested when exchange start (X00) is not on then global
control error end (X05) and the global control service end signal (X04) will
turn on at the same time.
(b) The slave I/O is not held/deleted when the global control error end signal
(X05) is on.

Global control request
Global control request signal (Y04)

Global control end
Global control end signal (X04)
Global control error end
Global control error end signal (X05)

(6) Operation mode signal (X10)
Indicates whether the current operation mode is the parameter setting mode or
not.
ON: Parameter setting mode
OFF: Normal service mode/extended service mode

(7) Operation mode change request signal (Y11), operation mode
change completion signal (X11)
Used to change the operation mode without resetting the CPU module.
(a) Operation mode change request signal (Y11)
OFF ¨ON: Requests the operation mode to be switched to the one specified in
the operation mode change request area (address 2255/8CFh) of
the buffer memory.
ON ¨OFF: Turns off X11.

(b) Operation mode change completion signal (X11)
Turns on when the result is stored into the operation mode change result
area (address 2256/8D0h) of the buffer memory. This signal also turns on
on normal or abnormal completion of an operation mode change.
This signal turns off when Y11 turns from ON to OFF.
Exchange start
request signal: Y00

Operation mode change
request signal: Y11

Operation mode change
completion signal: X11

TO instruction FROM instruction

Sets the operation mode Confirms the result in the
in the "operation mode "operation mode change result
change request area". area" and "current operation mode".

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(8) Communication READY signal (X1B)
(a) This is turned on when the station enters the exchange start possible state
after the QJ71PB92D has started up and the module READY signal (X1D)
has turned on. (Only during the normal service mode (MODE O) and
extended service mode (MODE E).)
(b) This turns off when a exchange continuation impossible error occurs.
(c) The exchange start request signal (Y00) is used as an interlock when turned
on by the sequence program.

(9) Module READY signal (X1D)
(a) This is turned on when the QJ71PB92D is started up. regardless of the
operation mode at the time of starting.
(b) This is turned of when the QJ71PB92D goes down.

(10) Watchdog timer error end (X0D)
(a) This turns on when a Watchdog timer error occurs.
(b) The signal will not be turned off until the module is reset or the power of
QJ71PB92D is turned ON.

(11) Communication trouble area type selection (Y03)
(a) This signal is used to select the communication trouble area type (ring type or
fixed type).
ON: Fixed type
OFF: Ring type
(b) This signal becomes valid when the exchange start or communication trouble
area clear request (Y02) is ON.

Fixed type
selection
Communication trouble area (Becomes valid)
type selection (Y03)
Ring type selection

Exchange start or communication
Initial type trouble area clear request (Y02) on

(12) Dedicated instruction valid signal (Y0C)
(a) This signal is used when the dedicated instruction for separation prevention is
validated.
ON: Read/Write by dedicated instruction is validated.
OFF: Read/Write by dedicated instruction is invalidated.
(b) Keep the signal turned ON while the dedicated instruction is being used.

(13) Restart request signal (Y0D)
(a) When the QJ71PB92D goes down for some reason (when the FAULT LED
turns on and X1D is off) then turning Y0D from off to on to off again will make
it possible to restart the QJ71PB92D.
(b) The same state will be entered if after start up the power supply is turned off
and then on again.

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3.4 Buffer Memory List

3.4.1 Buffer memory/configuration

The configuration of the buffer memory used to receive and send data with the
QJ71PB92D and the PLC CPU is described below.

Buffer memory address
Area name Description
decimal (Hexadecimal)
0 (0H) Input area This is the area that stores the input data from the slave.

959 (3BFH)
960 (3C0H) Output area This is the area that stores the output data to the slave.

1919 (77FH)
1920 (780H) Address information area This is the area that shows the slave address and I/O data length.

2039 (7F7H)
2040 (7F8H) Communication trouble area This is the area that shows the trouble information that occurred during
communication.
2079 (81FH)
2080 (820H) Slave error information cancel area This is the area that sets the data that masks the slave trouble information.
2081 (821H) Global control area This is the global control function hold/cancel selection area.
2082 (822H) Not usable 
2083 (823H) Time out time setting area (Closed to users This is used to set the time out time when an exchange start/stop is executed.
because this is a debugging function.)
2084 (824H) Trouble no information time setting area This is used to set the time that does not inform the communication trouble
after the exchange start.
2085 (825H) Not usable

2095 (82FH)
2096 (830H) Expansion communication trouble area This area shows the expansion information of the trouble information which is
occurred during the communication.
2110 (83EH)
2111 (83FH) Not usable 
2112 (840H) Slave status area This is the area that shows the status information of each slave.

2116 (844H)
2117 (845H) Not usable

2127 (84FH)
2128 (850H) Input/Output start address area (Extended This is the area that shows the addresses to start the input area and output
service mode only) area of each slave.
2247 (8C7H)
2248 (8C8H) Not usable

2253 (8CDH)
2254 (8CEH) Current operation mode area This area indicates the operation mode of the QJ71PB92D when it has started
up.
2255 (8CFH) Operation mode change request area In this area, set the operation mode of the QJ71PB92D which you want to
choose.
2256 (8D0H) Operation mode change result area This area indicates the execution result of the operation mode change
request.
2557 (8D1H) Local station address display area Area in which the station address of the local station is stored.
2558 (8D2H) Self-diagnosis status code area Area in which the code indicating the status of the self-diagnosis during the
execution of the diagnosis is stored.
2259 (8D3H)
Not usable 
3775 (EBFH)

POINT
Don't read and write to the buffer memory which is not usable.
If you perform it, it cannot guarantee as the QJ71PB92D function.

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3.4.2 Buffer memory detailed description

(1) INPUT area (Buffer memory address: 0 (0H) to 959 (3BFH))
Either the normal service mode (Mode 0) or extended service mode (Mode E)
can be selected using GX Configurator-DP.
(a) Normal service mode (MODE 0)
This is the area that stores the input data from the slave station.
This area is fixed to an allocation of 32 bytes (16 words) per station for a
total of 60 stations worth. This input area configuration is as follows.
Example : When the input data length for the first station is set to 29 bytes
and that for the second station to 32 bytes
b15 (Upper byte) (Lower byte) b0
Buffer memory 0(0H) Buffer memory 0(0H)
address decimal 1st station 2nd byte 1st station 1st byte
1st station input data address decimal
(Hexadecimal) (Hexadecimal)
15(FH) 1(1H) 1st station 4th byte 1st station 3rd byte
16(10H)
2nd station input data 1
31(1FH)
14(EH) 1st station 29th byte

15(FH)
n th station input data 16(10H) 2nd station 2nd byte 2nd station 1st byte
17(11H) 2nd station 4th byte 2nd station 3rd byte

944(3B0H) 1
60th station input data
959(3BFH) 30(1EH) 2nd station 30th byte 2nd station 29th byte

31(1FH) 2nd station 32nd byte 2nd station 31st byte

b15 b0

: Free area (00H)
1 Since the data area is fixed to 32 bytes,
all unused areas will become free.

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(b) Extended service mode (MODE E)
This is the area that stores the input data from the slave station.
In this area, the data length (in byte units) for each station is assigned in
variable length according to the parameter file set in the GX Configrator-DP.
The data length can be set in the range of 0 to 244 bytes.
Number of stations that can be set will vary in the range of 1 to 60,
depending on the specified data length. For example, seven stations can be
set if the data length for each station is 244 bytes, and 60 stations if the data
length is 32 bytes.
Example : When the input data length for the first station is set to 23 bytes
Buffer memory Buffer memory
address decimal address decimal
(Hexadecimal) (Hexadecimal) b15 (Upper byte) (Lower byte) b0
0(0H) 0(0H) 1st station 2nd byte 1st station 1st byte
1st station input data
11(BH) 1(1H) 1st station 4th byte 1st station 3rd byte
12(CH)
2nd station input data
15(FH)

10(AH) 1st station 22nd byte 1st station 21st byte

11(BH) 1st station 23rd byte
2
n th station input data
12(CH) 2nd station 2nd byte 2nd station 1st byte

13(DH) 2nd station 4th byte 2nd station 3rd byte

14(EH) 2nd station 6th byte 2nd station 5th byte

15(FH) 2nd station 7th byte
60th station input data
b15 b0
: Free area (00H)
2 When the data lenghth is set to an odd number
of bytes, the last upper byte becomes a free area
and data for the next station is assugned from
the next address.

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(2) OUTPUT area (Buffer memory address: 960 (3C0H) to 1919
(77FH))
Either the normal service mode (Mode 0) or extended service mode (Mode E)
can be selected using GX Configurator-DP.
(a) Normal service mode (MODE 0)
This is the area that stores the output data to the slave station.
This area is fixed to an allocation of 32 bytes (16 words) per station for a
total of 60 stations worth. This output area configuration is as follows.
Example : When the output data length for the first station is set to 1 bytes
address decimal address decimal
960(3C0H) 960(3C0H) 1st station 1st byte
1st station output data
975(3CFH) 961(3C1H)
976(3D0H)
2nd station output data 1
991(3DFH)
974(3CEH)

975(3CFH)
n th station output data 976(3D0H) 2nd station 2nd byte 2nd station 1st byte

977(3D1H) 2nd station 3rd byte
1

1904(770H)
60th station output data
1919(77FH) 991(3DFH)

b15 b0
: Free area (00H)
1 Since the data area is fixed to 32 bytes,
all unused areas will become free.

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(b) Extended service mode (MODE E)
This is the area that stores the output data to the slave station.
In this area, the data length (in byte units) for each station is assigned in
variable length according to the parameter file set in the GX Configrator-DP.
The data length can be set in the range of 0 to 244 bytes.
Number of stations that can be set will vary in the range of 1 to 60,
depending on the specified data length. For example, seven stations can be
set if the data length for each station is 244 bytes, and 60 stations if the data
length is 32 bytes.
Example : When the output data length for the first station is set to 19 bytes
address demical address demical
960(3C0H) 1st station 2nd byte 1st station 1st byte
960(3C0H)
969(3C9H) 961(3C1H) 1st station 4th byte 1st station 3rd byte
970(3CAH)
2nd station output data
972(3CCH)

968(3C8H) 1st station 18th byte 1st station 17th byte

969(3C9H) 1st station 19th byte
2
n th station output data
970(3CAH) 2nd station 2nd byte 2nd station 1st byte
971(3CBH) 2nd station 4th byte 2nd station 3rd byte

972(3CCH) 2nd station 5th byte

b15 b0
60th station output data
: Free area (00H)
2 When the data lenghth is set to an odd number
of bytes, the last upper byte becomes a free area
and data for the next station is assugned from
the next address.

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(3) Address information area (Buffer memory address: 1920 (780H) to
2039 (7F7H))
This area shows the station address, input byte length, and output byte length for
each slave station. This allocation is set by the GX Configrator-DP. The station
addresses for the 1st through the 60th stations are stored in the order of
registration in the GX Configrator-DP. (Station addresses: 1 to 126, do not need
to be sequential numbers.)
The address information area configuration is shown below. For details refer to
Section 3.4.2 (4).
Buffer memory
address demical
(Hexadecimal)

1920(780H) Station address of 1st station

1921(781H) 1st station input byte length 1st station output byte length

1922(782H) Station address of 2nd station

1923(783H) 2nd station input byte length 2nd station output byte length

Station address of n station

n th station input byte length n th station output byte length

2036(7F4H) Station address of 59th station

2037(7F5H) 59th station input byte length 59th station output byte length
2038(7F6H) Station address of 60th station

2039(7F7H) 60th station input byte length 60th station output byte length

(a) The station address of unallocated stations is FFFFH, and the I/O byte is
FFH.

(b) When the I/O byte length of allocated stations is 0, a 0 is stored for the byte
length.

(c) The n does not show the station address but represents a number (the nth
number) used for the input/output area.

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(4) Example address information area, INPUT area, and OUTPUT
area
The QJ71PB92D reads the slave station address and I/O byte length set by the
parameter file which is set by the GX Configrator-DP and stores these in the
buffer memory address information area.
With the QJ71PB92D, I/O areas are assigned to each slave station based on the
I/O byte length information in the address information area, and each I/O data will
be stored in the corresponding buffer memory area (MODE E).

Example : At extended service mode
address demical INPUT/OUTPUT area address demical Address information area
(Hexadecimal) b15 b0 (Hexadecimal) b15
b0
1st station 2nd input byte 1st station1st input byte 1920(780H) 5 1
0(0H)
1st station 3rd input byte 3 0
1(1H) 1921(781H) 2 3
2(2H) 2nd station 2nd input byte 2nd station 1st input byte 1922(782H) 10

3(3H) 2nd station 4th input byte 2nd station 3rd input byte 1923(783H) 7 5
IN P U T

4(4H) 2nd station 6th input byte 2nd station 5th input byte

5(5H) 2nd station 7th input byte
1 Station address (FFFFH if not assigned)
2 Input byte length (FFH if not assigned)
6(6H) 3 Output byte length (FFH if not assigned)
1, 2 and 3 are also set in a reserved station.

959(3BFH)
960(3C0H) 2nd station 2nd output byte 2nd station 1st output byte
961(3C1H) 2nd station 4th output byte 2nd station 3rd output byte
4
OUTPUT

962(3C2H) 2nd station 5th output byte

963(3C3H) : Vacant area
(The free areas in the INPUT area
are initialized with [00H].)

1919(77FH)

4 Since output from the first station has a byte length of 0,
no area is allocated in the OUTPUT area.

CPU module QJ71PB92D

PROFIBUS-DP
network

Slave Slave

Station address : 10 Station address : 5
Input data length : 7 byte Input data length : 3 byte
Output data length : 5 byte Output data length : 0 byte

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(5) Communication trouble area (Buffer memory address: 2040 (7F8H)
to 2079 (81FH))
When some kind of trouble occurs during communication the QJ71PB92D stores
the contents of the trouble in this area. Fixed type or ring type can be selected for
this area by turning the communication trouble area type selection (Y03) on or off
(refer to Section 3.3.2 (11)).
As shown in the following diagram, a total of 8 pieces of trouble information that
consist of the trouble code, detailed data length, and detailed data can be stored
in the basic configuration regardless of whether for fixed or ring data.
Ring type data is stored in order from the header with the header always being
the latest trouble information.
With fixed type data, when 8 pieces of trouble information are stored the areas 2
to 8 (data 1 to 7) are fixed, so when the next new trouble occurs only header area
1 (data 8) is updated.
All trouble information for either type can be cleared by turning on the
communication trouble detection signal reset (X01). When communication
trouble detection signal reset (Y01) is on, the contents of the communication
trouble area are hold though the communication trouble detection signal (X01)
turns off.
The communication trouble area configuration is as follows.

(a) Communication trouble area configuration
address demical address demical
(Hexadecimal) (Hexadecimal)
2040(7F8H) 2040(7F8H) Error code (refer to the next page.)
Trouble information area 1
2044(7FCH) 2041(7F9H) Detailed data length (0 to 3)
2045(7FDH) 2042(7FAH) Detailed data 1
2049(801H) 2043(7FBH) Detailed data 2
2044(7FCH) Detailed data 3
2050(802H)
2054(806H)

2075(81BH)
2079(81FH)

Trouble Data 2 Data 8 Data 9
information area 1 Data 1
Trouble Data 8
Data 1 Data 7
Ring type

information area 2

Trouble
information area 8
Data 1 Data 2

Trouble Data 1 Data 2 Data 8 Data 9
information area 1
Fixed type

Trouble Data 1 Data 7 Data 7
information area 2

Trouble
information area 8 Data 1 Data 1

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(b) Error codes
The error codes are shown below.
Error Data Detailed data Communi-
Description User processing
Code length 1 2 3 cation state
0200H (c) (c) (c) (c) (c) (c)
Ref. Ref. Ref. Ref. Ref. Ref.
1211H 1 03h   The slave address specified in the parameter is
the same as that of the master. This error occurs
immediately after the power supply is turned on or
the CPU is reset. Even though this error is
occurring, if the exchange start (Y00) is on then
error of error code 3000H will occur, the FAULT
LED will turn on, and operation will stop.
1300H 1 Contents Contents  Not even 1 active slave station is set in the 1) Set 1 or more active
ref. ref. parameter. When this error occurs the detailed slaves in the
data is set to: parameter.
Detailed data 1: Number of slaves set in the 2) When the FAULT
parameter. LED is turned on,
This error occurs immediately after the power reset is enabled by
supply is turned on or the CPU is reset. Even turning OFF ON
though this error is occurring, if the exchange OFF the Y0D
start (Y00) is on then error of error code 3000H
will occur, the FAULT LED will turn on, and
operation will stop.
1301H 1 Ignored   The parameter area space is insufficient. Reduce the number of
connected stations or
change the slave
station type.
3000H 1 Ignored   1) When the above errors 1211 H or 1300 H have For 1)
occurred before this error: Refer to the above
Refer to errors 1211 H, 1300 H above. 1211 H, 1300 H
2) Otherwise errors.
An unexpected error has occurred. For 2)
Contact the nearest
Mitsubishi Electric
branch office or
dealer.
: Exchange stops after the error occurs. : Exchange continues.

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(c) When the trouble code = 0200H
For a slave trouble information occurrence (error code = 0200H), the slave
trouble information is stored in the detailed data. The communication trouble
area configuration for this case is shown below. In addition, the expansion
communication trouble information is stored in buffer memory 2096 to 2110
for only the latest trouble information of the error code = 0200H trouble
information. For information regarding the expansion communication trouble
information refer to Section 3.4.2 (6).

Error code = slave trouble information occurrence
Detailed data length = 3
Detailed data 1 Master address ( 1) Slave address ( 2)
Detailed data 2 Trouble information
Detailed data 3 Slave ID ( 3)

1 The station address of the master station that controls the slave station in which this
trouble information occurred is stored. However, FFH is stored when the trouble
information shows the exchange with the slave is failed.
2 The station address of the slave station in which this trouble information occurred is
stored.
3 Individual slave inherent ID No. from the PNO is stored. However, FFH is stored for
trouble information that shows that the exchange with the slave failed.

The trouble information is shown in a 16-bit bit string, and the bits that correspond to
the respective trouble occurrences are set. A description of the error information is
given below.

: Exchange continues even if trouble occurs.
Communi- Setting
bit Description Processing
cation state station
15 Controlled by another master. Multiple masters are trying to communicate with the same Master
slave, so recheck the parameter.
14 The parameter transmitted by the master is Check the parameter. Slave
incorrect.
13 The response from the slave is incorrect. Check the slave or network status. Master
12 The function requested by the master is not Check the slave specifications. Especially if global control is Slave
supported. supported.
11 Expansion trouble information exists. Check the slave status. (refer to Section 3.4.2 (6).) Master
10 The I/O byte size parameter received from the Check the slave parameter. Slave
master does not match that of the slave.
9 The slave is not ready to exchange. This trouble information will always occur at exchange start, Slave
so it can be ignored. If this trouble occurs during exchange,
check the slave status and communication circuit.
8 Exchange with the slave cannot be Check the slave status and communication circuit. And Master
conducted. check the parameter.
7 Separated from the cyclic exchange by the This trouble information will always occur at exchange start, Master
parameter setting. so it can be ignored. Check if the parameter on the network
was changed by a class 2 master.
6 0 (reserved)   Slave
5 The slave has entered the SYNC mode. (Normal operation) Slave
4 The slave has entered the FREEZE mode. (Normal operation) Slave
3 Watchdog monitoring is being conducted in (Normal operation) Slave
the slave.
2 0 (fixed)   Slave
1 Diagnostic data read request. Check the slave statue. Slave
0 Parameter allocation request from a slave. This error information will always occur at exchange start, so Slave
it can be ignored. If this error occurs during exchange, check
the slave status and communication circuit.

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(6) Expansion communication trouble area (Buffer memory address:
2096 (830H) to 2110 (83EH))
This area shows the latest expansion trouble information for only one of the latest
expansion trouble information in the error code 0200H error information stored in
buffer memory 2040 to 2079 communication error area (Refer to Section 3.4.2
(5)).
Buffer memory
Communication trouble area address demical Expansion trouble information area
(When fixed buffer is selected.) No error code=0200H (Hexadecimal)
expansion trouble
Area 1 Data 10 information (trouble 2096 (830H)
information bit 11 = 0)

Area 2 2097 (831H)
Data 7

Data 6
(Latest data)
Data 5

Data 4 There is error code=
0200H expansion
trouble information
Data 3 (trouble information
bit 11 = 1)
Data 2

2110 (83EH)
Area 8 Data 1

(a) Buffer Memory 2096 (830H)
The latest expansion communication trouble information length stored from
buffer memory 2098 is stored as a byte length unit.
Buffer memory
address demical Expansion trouble information area
(Hexadecimal)

9096 (830H) 21

9097 (831H)

9098 (832H)

21 bytes = 10 words + 1 byte

2110 (83EH)

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3 SPECIFICATIONS
MELSEC-Q

(b) Buffer memory 2097 (831H)
Only bit 7 is valid. Other bit is fixed in 0. Bit 7 is turned on when the slave
sends expansion trouble information that is 27 bytes or more.
MSB LSB

Bit position 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 fixed 0 fixed

(c) Buffer memory 2098 to 2110 (832H to 83EH)
The following informations are stored in this area:
Device related trouble information
This area stores the slave station inherent self-diagnostic information that
is not set by the PROFIBUS-DP standards.
Identifier related trouble information
For module type slave stations, whether or not a module error has
occurred is stored as bit information.
Channel related trouble information
For module type slave station, this stores the, error information of all
modules outputting an error.

1) Device Related trouble information
This stores the slave module inherent trouble information that is not set
by the PROFIBUS-DP standards. The device related trouble can be
divided by header and trouble information. This area stores a 2 bit
value that is the device related trouble information in the header,
including the header (1 byte), and the device related trouble information
for this area.
Buffer memory
address demical
(Hexadecimal)
Header:
Header MSB LSB
2098 (832H) (2nd byte) (1st byte)
Bit position 7 6 5 4 3 2 1 0

2099 (833H) (4th byte) (3rd byte)

Device area length 2 to 63 in byte units

Bits 6 and 7 are set to 00.

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3 SPECIFICATIONS
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2) Identifier related trouble information
For module type slave stations, this stores as bit information whether or
not a module is outputting an error. The identifier related trouble
information can be divided into header and trouble information. This
area stores a 2 bit value that is the identifier related trouble information
in the header, including the header (1 byte), and the device related
trouble information for this area.

(End of device area)
Buffer memory
Header:
Header MSB LSB
(2nd byte) (1st byte)
Bit position 7 6 5 4 3 2 1 0

(4th byte) (3rd byte)

Identifier area length 2 to 63 in byte units

Bits 6 and 7 are set as 01.

MSB LSB

Bit position: 7 6 5 4 3 2 1 0
2nd byte When this bit is 1, the 0th module has an error.

When this bit is 1, the 7th module has an error.
3rd byte 15 14 13 12 11 10 9 8

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3) Channel related trouble information
When a module type slave station, this area stores the trouble
information for each module that is outputting an error. This area does
not have a header and stores this information at the end of the identifier
related trouble information. Each channel trouble information consists
of an identifier No., channel No., and error type of 3 bytes.

(End of identifier area)
Buffer memory 1st byte: Identifier No.

(2nd byte) (1st byte) MSB LSB
channel No.1 identifier No.1
Bit position 7 6 5 4 3 2 1 0

(4th byte) (3rd byte)
identifier No.2 trouble type 1

Identifier Nos. 0 to 63
(6th byte) (5th byte)
trouble type 2 channel No.2
bits 6 and 7 are set to 10.

2nd byte: Channel No.

MSB LSB

7 6 5 4 3 2 1 0
Bit position
Input/output
00 = Reserved
Channel number 0 to 63 01 = Input
10 = Output
11 = Input/output

3rd byte: Trouble type
MSB LSB

Bit position 7 6 5 4 3 2 1 0

Error type:
0 Reserved 10 Reserved
1 Short circuit
2 Voltage too low
Channel type 3 Voltage too high
000 = Reserved 15 Reserved
4 Overload
001 = Bit 5 Temperature too high 16 Manufacturer
010 = 2 bit 6 Disconnected wire
011 = 4 bit 7 Upper limit exceeded
100 = byte 8 Lower limit exceeded 31 Manufacturer
101 = Word 9 Error
110 = 2 words
111 = Reserved

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3 SPECIFICATIONS
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4) Identifier No., channel No.
The slave identifier No. and channel No. are discussed below. The
identifier No. is the No. that is attached from the header of each slave
module. Each module can have multiple channels. Refer to the each
slave specifications regarding to the channel numbering method.

Slave
16 point 32 point 32 point
DI DO DO
byte byte 2 words
2 channels 4 channels 1 channels

PROFIBUS-DP
network

Slot No. 0 1 2
Identifier No. 0 1 2
Channel No. 0,1 0,1,2,3 0

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MELSEC-Q

(7) Example expansion communication trouble area
Buffer memory
address demical
(Hexadecimal)

2096(830H) Expansion communication trouble information length (byte length)

2098(832H) 00 Header (length 4)
Device : Vendor independent trouble information

0 01 01 01 Header (length 4)
Identifier Identifier Nos. 0 and 2 have trouble information.
0 0

01 00 00 01 10 00 00 00

10 00 00 10 10 00 01 00
11 00 01 11 10 00 00 00 Channel Identifier No.0 and
channel No. (slot) 1 correspond,
10 channel type: byte, error: overload.

Identifier No.2 and
channel No. (Slot) 0 correspond,
channel type: 2 words, error: exceeds high limit value

Slave
16 point 32 point 32 point
DI DO DO
byte byte 2 word
2 channels 4 channels 1 channels

PROFIBUS-DP
network

Slot No. 0 1 2
Identifier No. 0 1 2
Channel No. 0,1 0,1,2,3 0

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3 SPECIFICATIONS
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(8) Slave trouble information cancel area (Buffer memory address:
2080 (820H))
This stores the value that masks the slave trouble information (error code =
0200H detailed data 2). Even if the slave trouble information corresponding to this
area bit occurs the slave trouble information detection signal (X01) and
RSP.ERR LED do not turn on. In addition, the trouble information is not stored in
the trouble information area. The default value is 02B9H.
This 02B9H trouble information also occurs during normal situations and is
masked. This value can only be changed when exchange start is off. (When on,
changes are ignored.)
Buffer memory
address demical
(Hexadecimal) b15 b0

2080(820H) Slave trouble information mask value

Slave trouble information
bit Description
15 Controlled by another master.
14 The parameter sent by the master is incorrect.
13 The response from the slave is incorrect.
To mask this 12 The function requested by the master is not supported.
trouble information
11 Expansion trouble information exists.
10 The environment data received from the master does not match that of the slave.

9 The slave is not ready to exchange.
8 Cannot exchange with slave.
7 Separated from the cyclic exchange by the parameter.
6 0 (reserved)
5 The slave has entered the SYNC mode.
4 The slave has entered the FREEZE mode.
3 Watchdog timer monitoring is being conducted in the slave.
2 0 (fixed)
1 Diagnostic data read request
0 Parameter allocation request from the slave

bit bit
Buffer memory
address demical 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
(Hexadecimal)
2080(820H) 0 0 0 0 0 0 1 0 1 0 1 1 1 0 0 1 = Set to 02B9H.

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(9) Global control area (Buffer memory address: 2081 (821H))
The buffer memory (2081(821H)) value and corresponding command table are
shown below.

Bit Value
Command Description
position (valid/invalid)
8 to 15 1/0 Group 1 to 8 selection Bits 8 to 15 correspond respectively to groups 1 to 8 and
shows that the bit value is transmitted by the global control
command to the 1 group (refer below). More than one
group at a time can be selected from groups 1 to 8.
When all bits 8 to 15 are 0, global control commands are
sent to all the slaves.
5 1/0 SYNC The actual output data is written and held.
4 1/0 UNSYNC The actual output data hold is canceled.
3 1/0 FREEZE The actual input data is held and read.
2 1/0 UNFREEZE The actual input data hold is canceled.

Bit position 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

: Don't care

Group 1 UNFREEZE

Group 2 FREEZE
Group 3 UNSYNC
Group 4 SYNC

Group 5
Group 6

Group 7

Group 8

Bit specifications for UNSYNC/SYNC and UNFREEZE/FREEZE

5 4 3 2 SYNC UNSYNC FREEZE UNFREEZE
0 0 0 0
0 0 1 b
0 0 1 0 b
1 0 0 b
1 0 0 0 b
1 1 b b
1 1 0 b b
1 0 1 b b
1 0 1 0 b b
: Don't care
b: Conducted
: Not conducted

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(10) Trouble no information time setting area (Buffer memory address:
2084 (824H))
Set the time at seconds unit, which does not inform the communication trouble
after the exchange start. Default value is 20 seconds so the communication
trouble is not informed for 20 seconds after the exchange start. By this setting, in
case the master power supply ON is faster than the slave power supply ON etc.,
it makes possible to prohibit an error that occurs temporary when system starts
up.

(11) Slave status area (Buffer memory address: 2112 (840H) to 2116
(844H))
This is the area that stores the status of each slave station.
The following figure shows the configuration:
Buffer memory
address demical
Communication (Hexadecimal) b15 b0
status area 2112(840H) Communication status (all stations)
for all stations 2113(841H)
Communication 2114(842H) Communication status
status area for 2115(843H) (station 1 to station 60)
individual stations
2116(844H)
b15 b0

Indicates the communication status for all Indicates the communication status of each of the individual
stations by a bit. stations by a bit. (Reserve station and not set station are treated
0: Normal in all stations as normal station)
1: Faulty station exists 0: Normal
b15 b0 1. Data link error occurred
b15 b0
1st station to 16th station
Communication status 17th station to 32th station
(Fixed at 0)
for all stations 33th station to 48th station
49th station to 60th station
b0
b15 (Fixed at 0)

The communication status of each slave
station under communication is set up.
This area is operated when either the normal
service mode (Mode 0) or extended service
mode (Mode E) is set up.

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3 SPECIFICATIONS
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(12) I/O start address area (Extended service mode (MODE E) only)
(Buffer memory address: 2128 (850H) to 2247 (8C7H))
This area stores the start addresses of I/O areas for each slave station.
Buffer memory This area is used while in the extended service mode
address demical
(Hexadecimal) b15 b0 (MODE E) only. When in the normal service mode
2128(850H) Input start address for 1st station (MODE 0), 0 is stored in all areas.
Data is set in this area during module startup
2129(851H) Input start address for 2nd station
according to the parameters stored in the master
2130(852H) Input start address for 3rd station station.
The start address is set in 1 word units for both input
IN P U T

and output. The data range is from 0 to 1919 (0 to
77FH).
2185(889H) Input start address for 58th station The start addresses are stored in the INPUT area,
2186(88AH) Input start address for 59th station starting from the head.
2187(88BH) Input start address for 60th station When nothing is assigned, -1 (FFFFH) will be set.
Example: When the input byte length and output byte
2188(88CH) Output start address for 1st station
length for the first station are 3 bytes and 5
2189(88DH) Output start address for 2nd station bytes, and those for the second station are 7
2190(88EH) Output start address for 3rd station bytes and 3 bytes, respectively:
OUTPUT

Address 2128 (850H) : 0 (0H)
Input start address
Address 2129 (851H): 2 (2H)
2245(8C5H) Output start address for 58th station
Address 2188 (88CH): 966 (3C6H)
Output start address
2246(8C6H) Output start address for 59th station Address 2189 (88DH): 969 (3C9H)
2247(8C7H) Output start address for 60th station

Input area
Address
Decimal (Hexadecimal)
0 (0H) 1st station 2nd input byte 1st station 1st input byte
1 (1H) 1st station 3rd input byte
2 (2H) 2nd station 2nd input byte 2nd station 1st input byte
3 (3H) 2nd station 4th input byte 2nd station 3rd input byte
4 (4H) 2nd station 6th input byte 2nd station 5th input byte
5 (5H) 2nd station 7th input byte

Output area
Address
Decimal (Hexadecimal)
966 (3C6H) 1st station 2nd output byte 1st station 1st output byte
967 (3C7H) 1st station 4th output byte 1st station 3rd output byte
968 (3C8H) 1st station 5th output byte
969 (3C9H) 2nd station 2nd output byte 2nd station 1st output byte
970 (3CAH) 2nd station 3rd output byte

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3 SPECIFICATIONS
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(13) Current operation mode area(Buffer memory address: 2254
(8CFH))
This area stores the value which indicates the operation mode of the
QJ71PB92D when it has started up.
Stored Value Detail
0000H Normal service mode (MODE 0) Where switched temporarily (not registered
0001H Parameter setting mode (MODE 1) in a Flash ROM) using GX Configurator-DP
0002H Self-diagnosis mode (MODE 2) or operation mode change request signal
000EH Extended service mode (MODE E) (Y11).
0100H Normal service mode (MODE 0)
0101H Parameter setting mode (MODE 1)
Where registered in Flash ROM.
0102H Self-diagnosis mode (MODE 2)
010EH Extended service mode (MODE E)

(14) Operation mode change request area (Buffer memory address:
2255 (8CFH))
You can change the operation mode of the QJ71PB92D by writing the required
operation mode to this area and turning on the operation mode change request
signal Y11.
You can also specify whether that setting is registered onto Flash ROM or not.
To choose the required operation mode, set any of the following values to the
operation mode change request area.
(At power-on or CPU reset, the invalid value = FFFEH enters the operation mode
change request area. If you have accidentally turned on the operation mode
change request signal Y11, the QJ71PB92D detects an error and the operation
mode is not changed.)
Setting Value Detail
0001H Parameter setting mode (MODE 1) Changes only the current mode (does not
0002H Self-diagnosis mode (MODE 2) register in Flash ROM).
0101H Parameter setting mode (MODE 1) Changes the current mode, and registers as
0102H Self-diagnosis mode (MODE 2) a startup mode in Flash ROM.
Changes to the normal service mode, and
deletes the registration in Flash ROM. The
FFFFH Parameter setting mode (MODE 1)
default is the parameter setting mode
(MODE 1).

When the power is turned ON or the CPU is reset, the operation mode registered
in the Flash ROM is started.
When the mode registered in the Flash ROM using FFFFH is erased, the
parameter setting mode (MODE1) is started.

(15) Operation mode change result area (Buffer memory address: 2256
(8D0H))
This area stores the execution result of the operation mode change request.
0: Normal completion.
1: Abnormal completion. (A mode change request of the unauthorized value
was given.)
On abnormal completion, the QJ71PB92D does not change the operation mode.
It maintains the same operation mode as before the change request was given.
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3 SPECIFICATIONS
MELSEC-Q

(16) Local station address display area (Buffer memory address: 2557
(8D1H))
Used to store the number of the local station.
The storage area is 0 to 125.

(17) Self-diagnosis status code area (Buffer memory address: 2558
(8D2H))
Used to store the test status of the offline test using codes.
The types of the codes are as listed below.
Code Status
0001H Under MPU test.
0002H Under time test.
0003H Under interruption test.
0004H Under RAM1 test.
0005H Under RAM2 test.
0010H Under swap circuit test
0011H Under Flash ROM test.
8001H An MPU test error occurs.
8002H A timer test error occurs.
8003H An interruption test error occurs.
8004H A RAM1 test error occurs.
8005H A RAM2 test error occurs.
8010H A swap circuit test error occurs.
8011H A Flash ROM test error occurs.

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4. FUNCTIONS

4.1 Functions for Exchanging with Slaves

The main function in the QJ71PB92D is for exchanging I/O data with slave stations
connected to the PROFIBUS-DP network. The method used for this exchange is to
read/write the I/O image in the buffer memory using auto refresh setting, FROM/TO
instruction, or dedicated instruction.
A schematic drawing of this exchange function is as follows.
CPU module QJ71PB92D (Class 1 master)

Buffer memory

Read Input Input
1 image image
1: Either auto refresh, FROM
instruction, or dedicated
4 Write Output Output instruction (BBLKRD)
image 2: Either auto refresh, TO
2 image
instruction, or dedicated
instruction (BBLKWR)

PROFIBUS-DP network

Input image Input image

Output image Output image

Slave station

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4 FUNCTIONS
MELSEC-Q

4.1.1 Exchange flow

The I/O data exchange flow with slave station is shown below.
The refresh between the CPU and QJ71PB92D and the refresh of buffer memory of
QJ71PB92D are executed asynchronously with each other.
Set the slave trouble information
cancel area. (Setting is
unnecessary if the default value
can be left unchanged.)

Communication trouble area type
selection (This setting is
unnecessary if the default value
can be left unchanged.)

Write the initial OUTPUT data
value in the output area.
4
Turn ON the exchange start
request signal (Y00).

Check that the exchange start/end
signal (X00) is ON.

The input data will be read from Read the input data from the input Turn ON the dedicated instruction
the input area to the device of the area using the FROM instruction. valid signal (Y0C).
CPU specified by the auto refresh
setting.

The output data from the device of Write the OUTPUT data in the Read the input data from the input
the CPU specified by the auto output areain the buffer memory area using the dedicated
refresh setting will be written to the using the TO instruction. instruction (BBLKRD).
output area in the buffer memory.

Using the dedicated instruction
(BBLKWR), write the output data
to the output area in the buffer
memory.

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MELSEC-Q

4.1.2 Global control functions

Global control contains the four functions of SYNC, UNSYNC, FREEZE, and
UNFREEZE, which are functions that are used to maintain/cancel slave I/O for which
multicast communication is conducted at the same time.
The slaves that execute the global control function are those located in one or more
groups of the eight groups. The group No. of the group containing the slaves is set by
the configurator. In the QJ71PB92D the group can be arbitrary specified and the global
control commands transmitted using multicast communication. This makes is possible
to select a slave and conduct global control.
Master

PROFIBUS-DP network

Group 5
Group 1

The global control function is executed using X, Y, and FROM/TO instructions from the
sequence program.

(1) Service SYNC, UNSYNC
Master
(SYNC transmission to group 1)
Output data

SYNC

(Group 1)
(Group 1) (Group 2) (Group 1)

Slave 1 Slave 2 Slave 3 Slave n

Output image memory: Data is always refreshed using polling.

<During UNSYNC execution/default>The output image memory value is output unchanged
(normal condition)
<During SYNC execution>The output image memory value is only output once during the
SYNC service timing.

Service SYNC (issued in the same group)

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MELSEC-Q

(2) Service FREEZE, UNFREEZE
Master
(FREEZE transmission to group 3)
Input data

FREEZE
(Group 8) (Group 3) (Group 3) (Group 3)

Slave 1 Slave 2 Slave 3 Slave n

Input image memory: The data is always refreshed by polling.

<during FREEZE cancel/default>The actual input is input to the input memory unchanged
(normal condition)

<during FREEZE execute>The actual input is input once into the input image memory at the FREEZE
service timing.

Service FREEZE (issued within the same group)

(3) Group selection
The number of groups is from 1 to 8 if with a total of 8 groups.
The slave can exist in arbitrary group of the 8 groups. They can also exist in
multiple groups. (The configurator specifies in which group which slaves exist.)
Multiple groups can be arbitrarily selected from the sequence program and
global control executed.
When selecting group 0 and transmitting the service is transmitted to all slave
stations.
Master
(transmitted to
groups 1 and 2)

PROFIBUS-DP network

Slave

Group 1 Group 5 Group 2

Group 8

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MELSEC-Q

(4) Procedure for issuing a global service.
Sequence
program QJ71PB92D Slave

TO global control area

Turn on the global control
request signal (Y04).

Turn on the global control
end signal (X04). Global control service

Time

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MELSEC-Q

4.1.3 Word data swap function

This is the function to exchange (swap) the upper and lower bytes of the I/O data
stored in the buffer memories of the CPU and QJ71PB92D.
For the PROFIBUS-DP and MELSEC series, the function is used to input and output
word data into and from the slave because the upper and lower bytes are reversed to
each other in the processing of the word data.
The function enables the upper and lower bytes to be swapped in the area for each
station, and the word data processing need not swap the bytes using the sequence
program.
For the swap function setting method for word data, refer to the PROFIBUS-DP
configurator operating manual.

Standard Swap Function Settings Classified by Slave Station
Classification by slave station Swap function setting
Byte (I/O) data only Not swapped
Word data only Swapped
Mixture of byte (I/O) data and word data Not swapped (Only for word data, swapped using the
sequence program)

The following shows the examples of data transmission for non-execution/execution of
swap function classified by processed data.
Slave station Examples of data transmission (for input)
Nonexecution of swap (Initial setting)
CPU
QJ71PB92D
X0 = 1 Buffer memory Slave station
b15 to b8 b7 to b0 XF to X8 X7 to X0
X7 = 1
X8 = 0 0 to 01 to 1 0 to 01 to 1

XF = 0
Byte data (I/O)
only Execution of swap
CPU
QJ71PB92D
X0 = 0 Buffer memory Slave station
X7 = 0 Swap
X8 = 1 1 to 10 to 0 processing 0 to 01 to 1

XF = 1

QJ71PB92D Upper and
CPU Slave station
Buffer memory lower bytes
are reversed
to each other.
D0 34H 12H 34H 12H 12H 34H

Word data only
Execution of swap
QJ71PB92D Upper and
CPU Slave station
Buffer memory lower bytes
are reversed
Swap to each other.
D0 12H 34H 12H 34H processing 12H 34H

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Slave station Examples of data transmission (for input)

QJ71PB92D Slave station
CPU
Buffer memory
X0 = 1
X7 = 1 0 to 01 to 1 0 to 01 to 1
X8 = 0 Upper and
lower bytes
XF = 0 are reversed
to each other.
D0 34H 12H 34H 12H 12H 34H
Byte data (I/O) is
mixed with word
Execution of swap
data .
QJ71PB92D Slave station
CPU
Buffer memory
X0 = 0
X7 = 0 1 to 10 to 0 0 to 01 to 1
X8 = 1 Upper and
Swap lower bytes
XF = 1 processing are reversed
to each other.
D0 12H 34H 12H 34H 12H 34H

: For a slave station where byte data (I/O) is mixed with word data, it is
recommended to swap-process only the word data using the sequence program
without executing the swap function.

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MELSEC-Q

4.1.4 I/O data separation prevention function

The I/O data separation prevention function is a function to prevent the I/O data of the
PLC CPU from being unmatched with the I/O data of the slave station.
(1) I/O data separation prevention function
(a) The separation of I/O data occurs when the buffer memory is also read
from/written to the PLC CPU during the data transmission between the
buffer memory of QJ71PB92D and the slave station.
The following shows the example of the separation occurred when the data
is read from the PLC CPU during the data transmission from the slave
station to the buffer memory.

Example of separation of I/O data
QJ71PB92D
PLC CPU Slave station
Buffer memory
1 0 1 0 1 0
3 2 3 2 3 2
B A B A 5 4
D C D C 7 6
Data
Read transmission

: Area where data transmission from slave station is updated
: Area where data transmission from slave station is not yet updated

(b) When the separation prevention function is used, the reading from the PLC
CPU is waited during the data transmission from the slave station to the
buffer memory (input area ) of QJ71PB92D, and executed after the data
transmission has been completed.
Also, the data transmission to the slave station is waited until the writing
from the PLC CPU to the buffer memory (output area) of QJ71PB92D is
completed, and executed after the writing has been completed.

(c) To activate the I/O data separation prevention function, two methods are
available: a method to select the Separation Prevention in setting the auto
refresh and a method to use the dedicated instruction (BBLKRD/BBLKWR)
in the sequence program.
When a refresh is performed between the buffer memory of QJ71PB92D
and the PLC CPU using the FROM/TO instruction, the separation prevention
function cannot be used.

(d) The separation prevention function can be used when the CPU module has
the following serial No. (See section 2.5).
QCPU (Q mode): Serial No. 02092 and subsequent.

(e) When the separation prevention function is used, there is a wait for reading
from /writing to the PLC CPU and the data transmission between the CPU
and the slave station, therefore, the transmission between the PLC CPU and
the slave station is delayed.
For the transmission delay time, refer to section 6.2 Transmission delay
time.

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MELSEC-Q

(2) Separation prevention by auto refresh setting
When a data transmission between the buffer memory of QJ71PB92D and the
PLC CPU is performed by auto refresh setting, the separation is selected to
function the separation prevention.
To activate the separation prevention function, two methods are available: a
method to select the Separation Prevention in setting the I/O data batch auto
refresh and a method to select it in setting the auto refresh for each station.
The auto refresh is set to a parameter of QJ71PB92D using GX Configurator-DP.
For GX Configurator-DP setting operation, refer to the PROFIBUS-DP

[Master Settings Screen]

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MELSEC-Q

(3) Separation prevention by dedicated instruction
The separation prevention function is executed using the BBLKRD instruction
(read) and BBLKWR (write) which are the dedicated instructions for
reading/writing of the buffer memory from and to QJ71PB92D.
When the writing/reading of the buffer memory are executed using the FROM/TO
instruction, the separation prevention function cannot be used.
(a) For detail of the BBLKRD instruction, refer to section 8.1.
For detail of the BBLKWR instruction, refer to section 8.2.

(b) Use the BBLKRD instruction and BBLKWR instruction in pairs, and ensure
to execute for each sequence scan (Refer to the program example in section
7.4).
Even when either of the reading of input data and writing of output data is
not required, read/write the dummy input data or output data using the
BBLKRD/BBLKWR instructions.
When only either of the BBLKRD instruction and BBLKWR instruction is
used, the transmission delay time becomes longer.

G.BBLKRD U0 K0 D0 K10

Program processing input and output data

G.BBLKWR U0 K960 D0 K10

(c) Before the dedicated instructions (BBLKRD/BBLKWR) are executed, the
dedicated instruction valid signal (Y0C) must be turned ON.
If the dedicated instruction valid signal (Y0C) is turned OFF, the dedicated
instructions (BBLKRD/BBLKWR) will become invalid.

4 - 10 4 - 10

4 FUNCTIONS
MELSEC-Q

4.2 Operation Mode

QJ71PB92D has four operation modes: Normal service mode (MODE 0), Extended
service mode (MODE E), Parameter setting mode (MODE 1), and Self-diagnosis mode
(MODE 2).
The operating modes are set using the GX Configurator-DP.
Each of these modes is explained as follows.

Operation mode Description Reference
Normal service Mode in which a communication is made with the slave station.
mode The I/O areas for each slave station are allocated to a fixed 32 bytes. Section 4.2.1
(MODE 0)
Mode in which a communication is made with the slave station.
Extended service
The I/O areas for each slave station are allocated to the areas of any
mode Section 4.2.2
size (The I/O area size for each slave station is set using GX
(MODE E)
Configurator-DP).
Mode in which parameters are set in QJ71PB92D.
Normally, GX Configurator-DP switches the operation mode
automatically to this mode when setting parameters, and after setting
Parameter setting
the parameters, switches to the mode set in the flash ROM.
mode 
When the mode is set to the Parameter setting mode using the
(MODE 1)
operation mode change signal (Y11), the mode is changed to the other
operation mode using the GX Configurator-DP.
A communication with the slave station is not performed.
Self-diagnosis Mode in which the test for diagnosing the QJ71PB92D module for
mode hardware error. Section 5.4
(MODE 2) A communication with the slave station is not performed.

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4 FUNCTIONS
MELSEC-Q

4.2.1 Normal service mode (MODE 0)

This is the mode for communicating with the slave station by allocating 32 bytes (16
words) of I/O area of the QJ71PB92D buffer memory to each slave station.
Because the I/O area size of each slave station is fixed, the buffer memory address is
easier to understand, and the size need not be set to the parameters for each slave
station.
However, when the number of devices is 32 bytes or less, an empty space is produced
between the areas of the slave stations, and additional number of devices is required
for the batch reading/writing of the I/O area.
The fixedly set number of slave stations is 60.
After the communication start is completed (X00=ON), the data allocated to the fixed
area is transmitted to each slave station.
Before the communication is started or when it is interrupted, the I/O data is not
updated.
QJ71PB92D PROFIBUS-DP Slave station
buffer memory network (Station No. 1)
0 ( 0H) Input data
(32 bytes)
16 ( 10H) 2nd station input data Output data
(32 bytes)
Input area
32 ( 20H)
3rd station input data Slave station
(Station No. 2)
Input data (16 bytes)
Output data (16 bytes)
960 (320H)
1st station output data Slave station
(Station No. 3)
976 (330H) 2nd station output data Input data
(32 bytes)
Output area
992 (340H) Output data
3rd station output data
(32 bytes)

: Empty area

4 - 12 4 - 12

4 FUNCTIONS
MELSEC-Q

4.2.2 Extended service mode (MODE E)

This is the mode for communicating with the slave station by allocating any I/O area of
the QJ71PB92D buffer memory to each slave station.
Because the I/O area size can be set for each slave station, an empty space is not
produced in the buffer memory of QJ71PB92D. Therefore, the data can be read
from/write to the continuous area of the PLC CPU.
The area of allocation for each slave station is set using the GX Configurator-DP.
The area of allocation in the input and output areas for each station is 0 to 244 bytes (0
to 122 words).
The set number of slave stations 1 to 60.
When an area of 244 bytes (max) is allocated for each station, up to seven stations
can be set up.
After the communication start is completed (X00=ON), the allocated area data
equivalent to an amount of specified number of bytes is transmitted to each slave
station.
Before the communication is started or when it is interrupted, the I/O data is not
updated.
QJ71PB92D PROFIBUS-DP Slave station
buffer memory network (Station No. 1)
0 ( 0H) Input data
(32 bytes)
16 ( 10H) 2nd station input data Output data
Input area 24 ( 18H) (32 bytes)
3rd station input data
Slave station
(Station No. 2)
Input data (16 bytes)
960 (320H) Output data (16 bytes)
Slave station
976 (330H) 2nd station output data (Station No. 3)
Output area 984 (338H) Input data
3rd station output data
(32 bytes)

Output data
(32 bytes)

4 - 13 4 - 13

5 PROCEDURES BEFORE SYSTEM OPERATION
MELSEC-Q

5. PROCEDURES BEFORE SYSTEM OPERATION

5.1 Procedures before Operation

The procedure for newly connecting QJ71PB92D to an existing PROFIBUS-DP
network is explained below.
For the operation of GX Configurator-DP, refer to the PROFIBUS-DP configuration
operating manual.

Start

Set the PLC CPU to STOP

Set QJ71PB92D to the Self-diagnosis mode (MODE 2) using
GX Configurator-DP.

The QJ71PB92D starts self-diagnosis

5
Is there an error with Yes
self-diagnosis?
This is a hardware problem, so contact the
nearest Mitsubishi Electric dealer and explain
the symptoms to the dealer
No

Set parameters using GX Configurator-DP 1

No
Is the automatic refresh used?

Yes

Reset the PLC CPU

Set QJ71PB92D to the Normal service mode (MODE 0) or
Extended service mode (MODE E) using GX Configurator-DP

Start the communication using GX Configurator-DP
1 Refer to Chapter 5.1.1.

Whether READY LED is ON or
RSP ERR LED is OFF

Ready complete

5-1 5-1

MELSEC-Q

5.1.1 Parameter setting procedure

The procedure for setting the QJ71PB92D parameters is described below.
(1) Start GX Configurator-DP, and select the module type and mode from the [file]-
[New] menu.
(2) In the [Setup]-[GSD Device-Database] menu, register the GSD file (DDB file) for
each slave.
(3) Set the master parameters and bus parameters.
(4) Right-click on the symbolic graphics of the network, and select the [Insert DP-
Slave] from the menu, and set the slave type and slave parameters.
(5) On the [Action]-[Write to PB92D] menu, write parameters to QJ71PB92D.

Wite PLC CPU
GX Configurator-DP QJ71PB92D
(RS232 or USB)

5
GSD file for
slave station
(DDB file)

Max ST delay resp (Max Tsdr), Quiet Time (Tqui), Setup Time (Tset) in the parameter
to be set by the GX Configurator-DP ProfiMap must be match the maximum value
connected to the network, including master station.
The value of the QJ71PB92D is shown below.

Below
500Kbps 1.5Mbps 3Mbps 6Mbps 12Mbps
187.5Kbps
Max Tsdr 60 100 150 250 450 800
Tqui 0 0 0 3 6 9
Tset 1 1 1 4 8 16
: The GSD file (DDB file) for a slave station is supplied from the manufacturer of the
slave station.

5-2 5-2

MELSEC-Q

The parameter items set in QJ71PB92D using GX Configurator-DP are shown below.

(1) Master Parameter

Parameter Range Meaning
Name — States that the QJ71PB92D is a master.
9.6 kbps Transfer rate for the communication. Define a baud rate
Baud Rate
to12.000 Mbps that is supported by all slaves.
FDL address 0 to 125 FDL address (station number)
Head address 0 to 3F Module head address on the base unit
Output processing after error.
Error action flag — Check to shut off an output when an error occurs
(recommended for drivers and inverters).
Smallest allowed period of time between two slave poll
cycles. This ensures that the sequence of function
0 to 65535
Min.slave interval requests from the DP master can be handled by the DP
100 µs
slave. This value is valid for all installed slaves. The
slowest slave defines this value.
In case of master-master communication this parameter
0 to 65535
Polling timeout specifies the max. Amount of time it may take the
1 ms
requestor to fetch the response.
This parameter defines the period of time during which
0 to 65535 the QJ71PB92D notifies the slave operation status. This
Data control time
10 µs time is 6 times longer than the watch-dog control of
slaves.
Check when performing the auto refresh of the CPU
Autom.Refresh —
device and QJ71PB92D buffer memory.
Check when executing the separation prevention
Consistency — function at the time of auto refresh (Invalid when the auto
refresh is not executed).

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MELSEC-Q

(2) Bus Parameter
Usually, the bus parameters need not be changed.
When changing these parameters, understand the PROFIBUS-DP standards
beforehand.

Parameter Meaning Range Remark
Baud rate Transfer rate see selection Must be supported by
all slaves
T_sl Slot time 1 to 65535 t_bit Max.Interval to wait for
response
If the time is exceeded,
an error will be
detected
min T_sdr Min. Station delay of 0 to 65535 t_bit
responder
max T_sdr Max. Station delay of 0 to 65535 t_bit
responder
T_qui Quiet time 0 to 255 t_bit Time needed to switch
the transmission
direction of the
repeater
T = 0, if no repeater
present
T_set Setup time 1 to 255 t_bit
T_tr Target rotation time 1 to 1048576 t_bit
GAP factor Controls the GAP 1 to 100
update time (T_gud)
HSA Highest station 2 to 126
address
Max.retry limit Max.number of retries 1 to 8

5-4 5-4

MELSEC-Q

(3) Slave Parameter

parameter Range Meaning
Name — The name of the slave can be defined.
FDL address 0 to 126 This parameter is used to define the station address of the slave.
Click on the white box if you want to use the watchdog timer for this
device.
Watchdog —
If the watchdog time is exceeded, the outputs are turned to the save
state.
If you have selected the watchdog function, you must define the
0 to 65535 watchdog time interval of the slave.
Watchdog time
10 ms Make sure that the data control time in the Master Parameter setting is 6
times longer than the slave's watchdog time.
This is the minimum waiting time for a DP slave until it is allowed to send
min T_sdr 1 to 255
response frames to the DP master. Do not change this value.
Group
Click on the white boxes to allocate the group for the slave.
identification Grp1 to Grp8
A slave can belong to several groups (Grp1 to Grp8).
number
When this option is activated, you can get information whether the
Active — defined slave really exists. With this function, you can define slaves
which are not really existent but should be added physically later on.
When this option is activated, it is checked whether the slave supports or
not the SYNC function during the communication for initialization.
Sync (Output) —
If the slave does not support the SYNC function, the error code (0200H)
will be stored in the communication trouble area of QJ71PB92D.
When this option is activated, it is checked whether the slave supports
the Freeze function during the communication for initialization.
Freeze (Input) —
If the slave does not support the Freeze function, the error code (0200H)
will be stored in the communication trouble area of QJ71PB92D.
Input CPU Depending This section is used to define the CPU side device and head number
Device on slave corresponding to the input data
Output CPU Depending This section is used to define the CPU side device and head number
Device on slave corresponding to the output data
Swap I/O Click on the white box if you want to swap the I/O data on the buffer
—
Bytes memory of QJ71PB92D.
Use this button if you want to handle the word data.
Press this button and the slave user parameter setting window will
User Param. —
appear on the screen.
Do not change the slave user parameter.

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MELSEC-Q

5.2 Installation

The following section explains the precautions when handling the QJ71PB92D, from
the time they are unpacked until they are installed.
For more details on the module installation, see the user's manual for the PLC CPU
used.

5.2.1 Handling precautions

(1) Do not drop the module case or subject it to heavy impact since it is made of
resin.

(2) Do not remove the PCB of each module from its case. This may cause a
failure in the module.

(3) Be careful not to let foreign objects such as wire burrs enter the module
during wiring. In the event any foreign object enters, remove it immediately.

(4) The top surface of the module is covered with a protective film to prevent
foreign objects such as wire burrs from entering the module during wiring.
Do not remove this film until the wiring is complete. Before operating the
system, be sure to remove the film to provide adequate heat ventilation.

(5) Tighten the module mounting screws and connector mounting screws using
torque within the following ranges.
Screw location Tightening torque range
Module mounting screws (M3 screws) 36 to 48 N · cm
PROFIBUS cable connector mounting screws
20 to 28 N · cm
(#4 - 40UCN)

5.2.2 Installation environment

Refer to user’s manual of the CPU module used.

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MELSEC-Q

5.3 Part Names and Settings

Following is an explanation of the QJ71PB92D part names and settings.

QJ71PB92D
RUN TEST
SD/RD TOKEN
READY PRM SET
(a)
RPS ERR. FAULT

BUS TERMINATION
OFF ON (b)
PROFIBUS I/F

(c)

QJ71PB92D

No. Name Description Remark
(a) LED Displays the QJ71PB92D status.
Name Display description
RUN Displays the QJ71PB92D operation status.
ON : During normal operation
OFF : When there is an error
TEST Turns on when a self-diagnosis is executing.
SD/RD Flashing during communicating with slave on the
PROFIBUS network.
The flashing interval is the time interval of the bus
parameter's Data Control Time.
TOKEN Turns on when token is maintained.
READY Turns on when the PROFIBUS-DP network
subscription preparation is completed and during
subscription.

5-7 5-7

MELSEC-Q

No. Name Description Remark
(a) LED PRM.SET Turns on when the operation is in the Parameter
setting mode (MODE 1)(PARAMETER.SET).
If this is lit when the operation is in the Normal
service mode (MODE O) or Extended service
mode (MODE E), the parameters will not be
written.
RSP ERR. Turns on when communication error is occured.
FAULT Turns on when an error occurs.
(b) PROFIBUS This sets whether or not there is terminal resistance inside the Always ON for both
network terminal QJ71PB92D. (at time of shipment: OFF) ends of the station
resistance setting ON : has terminal resistance on the PROFIBUS-
switch OFF : no terminal resistance DP network.
(c) PROFIBUS Connector for connecting the table for the PROFIBUS-DP
1
interface connector network.

1: For the connector type, use a male D-Sub 9 pin. The user creates the
PROFIBUS cable. (for information regarding the cable wiring, refer to Item 5.5.)
The size of the screw which can be used for the connector is #4-40 UNC.

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MELSEC-Q

5.4 Execution Method for Self-diagnosis

This section describes the procedure for self-diagnosis, status during self-diagnosis,
and results after self-diagnosis.

(1) Procedure for self-diagnosis
The procedure for self-diagnosis is as follows.
1) Set QJ71PB92D to the Self-diagnosis mode (MODE 2) using GX Configurator-
DP or operation mode change request signal (Y11).
For the operation mode change operation, refer to the PROFIBUS-DP
The self-diagnosis will start automatically.
2) The TEST LED on QJ71PB92D will flash during the self-diagnosis.
3) When the results of the self-diagnosis are normal: The TEST LED and FAULT
LED go off.
If the results of the self-diagnosis are abnormal (an error occurs): The TEST
LED and FAULT LED will light up.
If the results of the self-diagnosis are abnormal, the self-diagnosis status code
will be stored in the self-diagnosis status area (buffer memory address: 2258
(8D2H)) of the buffer memory.

Self-diagnosis status code Type of error
8001H MPU test error
8002H Timer test error
8003H Interruption test error
8004H RAM1 test error
8005H RAM2 test error
80FFH Flash ROM test error

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MELSEC-Q

5.5 Wiring

5.5.1 PROFIBUS cable wiring

This section explains the wiring to PROFIBUS connector for the QJ71PB92D
(1) Pin assignments for the connector
Pin No. Symbol Name Application
1 SHIELD Shield, Protective Ground
2 RP 1 Reserved for Power
3 B/B’ RxD/TxD-P Receive/Transmit Data-P
4 CNTR-P 1 Control-P
5 C/C’ DGND Data Ground
6 VP 2 Voltage-Plus
7 RP 1 Reserved for Power
8 A/A’ RxD/TxD-N Receive/Transmit Data-N
9 CNTR-N *1 Control-N
1 Signal is optional.
2 When the terminal resistance value of building into is made it is, signal is used.
Wiring is not needed.
(2) Wiring
QJ71PB92D

1
SHIELD
PROFIBUS cable
3
RxD/TxD-P

8
RxD/TxD-N

REMARK
• For details on making Mitsubishi PLC conform to the EMC directive and low voltage instruction
when installing it in your product, please see Chapter 3,”EMC Directive and Low Voltage
Instruction” of the PLC CPU User’s Manual (Hardware).
• Please use the PROFIBUS cable with braided shield.

5.5.2 Terminator switch

(1) Whether or not to set the built-in module terminal resistance (1/2W 220 x 2
units) can be selected by connecting a switch. (The stations on both ends of the
PROFIBUS segment must be connected with terminal resistor.)
Silk display ON OFF
Disconnects terminal resistor (setting at time of
BUS TERMINATION Connects terminals resistor
shipment)
(2) When the QJ71PB92D's bus termination switch is set to on (has terminal resistor),
do not remove the PROFIBUS cable from the QJ71PB92D during PROFIBUS-
DP network operation. If the cable is removed, then the terminal resistor in the
network will disappear, causing an error and bringing down the network.
5 - 10 5 - 10

MELSEC-Q

5.5.3 Precautions against wiring

As one of the requirements to give full play to QJ71PB92D’s functions and make up
the system with high reliability, it is necessary to have an external wiring unsusceptible
to an influence of noise. Precautions against external wiring of QJ71PB92D is
described below.

(1) Do not route the wire of QJ71PB92D close to or bundle it together with the main
circuit and high-tension lines, or the load-carrying lines from other than the PLC.
Otherwise, the module may be susceptible to an influence of noise and surge
induction.

(2) The wires from the input/output modules of the PLC should be away from the
communication cable of PROFIBUS-DP interface module as far as possible as
shown in the figure below.

QJ71PB92D
Output module

Output module
Input module

Input module
Power supply

PLC CPU
module

Wiring of input
module
Shield twisted-pair cable

Wiring of output module

Shielded covering

(3) Grounding
(a) When the PROFIBUS-DP interface module is used, the FG and LG
terminals of the power supply module of the PLC should basically be
grounded.

(b) If communication cannot be performed after grounding because of
abnormal voltage applied to the FG terminal, the module may be used
without grounding.

5 - 11 5 - 11

MELSEC-Q

5.6 Maintenance and Inspection

For the QJ71PB92D, eliminate the check of cable connection and looseness and do
not include it as an inspection item. Otherwise, follow the inspection item instructions in
the PLC CPU User’s Manual to always use the system in good condition.

DANGER
! Switch all phases of the external power supply off before cleaning.
If you do not switch off the external power supply, it will cause failure or malfunction of the module.

CAUTION
! Never disassemble or modify the module.
This may cause breakdowns, malfunctioning, injury and/or fire.

! Switch all phases of the external power supply off before mounting or removing the module. If you do not
switch off the external power supply, it will cause failure or malfunction of the module.

! Do not touch the conductive area or the electronic parts of the module.
Doing so may cause malfunctioning or breakdowns.

5 - 12 5 - 12

6 COMMUNICATION TIME
MELSEC-Q

6. COMMUNICATION TIME

6.1 Bus Cycle Time

(1) Bus cycle time when there is one master station
An explanation of the bus cycle time when there is one master station is given in
the following diagram. The following diagram (Fig. 6.1) shows an example for
when there are 3 slave stations.

Time

QJ71PB92D
Buffer memory

QJ71PB92D
Internal buffer

Slave1

Slave2
6

Slave3

Treq(1) Tres(1) Treq(2) Tres(2) Treq(3) Tres(3)

Max Tsdr(1) Max Tsdr(2) Max Tsdr(3)

Lr Pt(1) Pt(2) Pt(3)

Tsdi(M) Tsdi(M) Tsdi(M)

MSI(Min Slave Interval)

Bc

Fig. 6.1 The bus cycle time when there is one master station

6-1 6-1

MELSEC-Q

The master bus cycle time Bc can be calculated as:
Number of the slave stations

Bc = Max (MSI, (Pt (i) + Tsdi (M)) + Lr
i=1

However,
The largest of A and B = Max (A, B)
Pt (i) = No.i station polling time = Treq(i) + Max Tsdr (i) + Tres (i)
Treq (i) No.i station request transmission time = ((number of output bytes to No.i
station + 9) 11)/baud rate
Max Tsdr (i) = No.i station response time ((This value is given in the slave GSD
(DDB) file.)/baud rate
Tres (i) No.i station response transmission time = ((Number of input bytes from No.i
station + 9) 11)/baud rate
Tsdi (M) = master request/response processing time (This value is given in the slave
GSD (DDB) file.)/baud rate
The master request/response processing time corresponding to baud rate is as
follows.

9.6 19.2 93.75 197.5 500 1.5 12
Baud rate 3Mbps 6Mbps
Kbps Kbps Kbps Kbps Kbps Mbps Mbps
Master request/response
10 15 15 80 80 150 150 150 150
processing time (ms)

Lr = data refresh time = 1.5 (ms) number of slave stations
MSI = polling cycle minimum cycle (set by GX Configurator-DP)
6

6-2 6-2

MELSEC-Q

(2) Bus cycle time when there are multiple master stations
Following is an explanation of the bus cycle time when multiple masters are
connected to the same network. The following diagram (Fig. 6.2) shows when 2
masters are connected to the same network. Bc(1) and Bc(2) in the following
diagram (Fig. 6.2) are the master 1 and master 2 bus cycle times respectively,
and their total time is calculated using the formula presented in Section 6.1.

Master 1 executes polling Master 2 executes polling Master 1 executes polling

Time

Master 1 bus cycle time Bc(1) Master 2 bus cycle time Bc(2)

TBC

Fig. 6.2 The Bus Cycle time when multiple masters are connected

As shown in this diagram, each master total bus cycle time is calculated as:
Number of the master stations

TBc = Bc (n)
n=1

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MELSEC-Q

6.2 Transmission Delay Time

The transmission delay time for input and output data is as follows.
(1) Without separation prevention function
A transmission delay time when I/O data is read/written using the automatic
refresh setting (without separation prevention function) or FROM/TO instruction.
(a) Output delay
Transmission delay time
Normal value Bus cycle time
Max. value Bus cycle time 2

(b) Input delay
Transmission delay time
Normal value Scan time 0.5 + Bus cycle time 0.5
Max. value Scan time + Bus cycle time

(2) With separation prevention function
A transmission delay time when I/O data is read/written using the automatic
refresh setting (with separation prevention function) or dedicated instruction.

(a) Output delay
Conditions Transmission delay time
Scan time 2 Bus cycle time Bus cycle time 2
Max. value
Scan time 2 > Bus cycle time Scan time 2 + Bus cycle time

(b) Input delay
Conditions Transmission delay time
Scan time 2 Bus cycle time Scan time + Bus cycle time
Scan time 2 > Bus cycle time and
Max. value Scan time + Bus cycle time 2
Scan time 3 Bus cycle time 2
Scan time > Bus cycle time Scan time 3

6-4 6-4

7 PROGRAMMING
MELSEC-Q

7. PROGRAMMING

The following shows the program examples used to execute the global control and
execute the separation prevention function using the dedicated instruction during the
communication in the Normal service mode (MODE 0) and Extended service mode
(MODE E).
The device allocation in the program example is as shown below
(QJ71PB92D head I/O number: 00H)
• X20 to X2F----------- : User command signal
• X100 to X14F ------- : Station to which input data is transferred from slave station
• Y100 to Y14F ------- : Station from which output data is transferred to slave station
• D0---------------------- : Storage of mode change result
• D1---------------------- : Storage of present mode
• D100 ------------------ : Storage of slave station 1 input address
(in Extended service mode (MODE E))
• D101 ------------------ : Storage of slave station 1 output address
(in Extended service mode (MODE E))
• D1000----------------- : Storage of communication trouble information

7.1 Communication Using Automatic Refresh Setting

The following shows the setting and program example used when the I/O data is
read/written using the automatic refresh setting.
(1) Automatic refresh setting
The following setting example assumes that the automatic refresh setting of I/O
data is made per slave.
(a) Make the automatic refresh setting in the master parameters.
[Master Settings] Autom. Refresh : Check 7

7-1 7-1

7 PROGRAMMING
MELSEC-Q

(b) In the slave parameters, set the devices and head numbers used for
automatic refresh.
Make settings using [Slave Parameter Settings]: Addresses in MELSEC CPU
Memory.You need not set the numbers of refresh points since they are
automatically calculated by GX Configurator-DP from the slave parameters.
When the devices set for input and output are bit devices, set the head
numbers in increments of 16 points.

(c) In the [Tools] menu, open [Profibus Configuration Utility].
In the PROFIBUS Configuration Utility main menu select File/New to create a
new IPARAM configurator project or File/Open to open an existing project.
Enter the file name for a new project or select an existing project from the
browse list.

7

7-2 7-2

7 PROGRAMMING
MELSEC-Q

(d) Before starting the communication with the PLC an entry in the network
configuration atabase must be selected. Right-click on the project window to
open the context menu and select Select Network to open the Select Network
Index dialog.

(e) Right-click on the project window to open the context menu and select Scan
Rack to obtain the list of boards in the rack.

7-3 7-3

7 PROGRAMMING
MELSEC-Q

(f) The information obtained from the CPU contains slot, head address, the actual
IO length of the module as well as a preset IO length and module name.

(g) You have to assign a GX Configurator file to each master, for which you
intend to include autorefresh settings in the IPARAM file.
Right-click on a DP master entry to select it and to open the context menu.
From the context menu select Assign Project.
(The menu item Remove Project removes the assignment of a GX
Configurator file to a master.)

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7 PROGRAMMING
MELSEC-Q

(h) A file browser dialog opens where you can select a GX Configurator-DP file to
be assigned to the selected DP master.

(i) Right-click on a DP master entry to select it and to open the context menu.
From the context menu select Edit Settings.

7-5 7-5

7 PROGRAMMING
MELSEC-Q

(j) The autorefresh settings editor dialog box appears. Check Slave Specific
Transfer.

POINT
You can use automatic block transfer to shorten I/O data transfer time. To use this
function, set I/O devices for Block Transfer in the above dialog box. At this time, the
autorefresh settings made using the slave parameters are invalid.
When the I/O devices set for Block Transfer are bit devices, set their head numbers
in increments of 16 points.

(k) Choose IPARAM File - Upload to PLC from the context menu and write the
IPARAM parameters to the PLC CPU.

POINT
When IPARAM is written to the CPU using this package during the start of GX
Developer, it is not displayed in the PLC Read/Delete PLC data and other file list of
GX Developer.
Therefore, update the file list using the "Refresh view" button on the Read from
PLC/Delete PLC data screen of GX Developer.

(l) After setting the IPARAM parameters, reset the PLC CPU.

7-6 7-6

7 PROGRAMMING
MELSEC-Q

(2) Program example
When the automatic refresh function is used, the read/write program is not
required for the input/output areas.

Not required if the initial setting is not changed.
Initial setting Slave trouble
information
cancel area
setting

Trouble
information
unnotification
time setting

Communication
trouble area
type (fixed type)

Initial output
data write

Communication
start

Normal
communication

Processing in which input data is used

Output data ON/OFF program
Transmission
data ON/OFF
program

Processing against communication trouble
Trouble
information
read
Trouble
detection signal
reset command
pulse

7-7 7-7

7 PROGRAMMING
MELSEC-Q

Communication
trouble detection
signal reset

Communication
trouble area
clear command
pulse

Communication
trouble area
clear command

Mode change Change to
self-diagnosis
mode
(MODE 2)

Execution of
operation
mode change
request

Read of
operation
mode change
results

Read of
present
operation
mode

7-8 7-8

7 PROGRAMMING
MELSEC-Q

7.2 Normal Service Mode (MODE 0) Using FROM/TO Instruction

The following shows the program example used when the I/O data is read/written
using the FROM/TO instruction in the Normal service mode (MODE 0).

Initial setting Slave trouble
information
cancel
area setting
Trouble
information
unnotification
time setting

Communication
trouble area
type (fixed type)

Initial output
data write

Communication
start

Normal
communication

Input area read



Write to out put area

7-9 7-9

7 PROGRAMMING
MELSEC-Q

Trouble
information read

Trouble detection
signal reset
command pulse

Communication
trouble detection
signal reset

Communication
trouble area
clear command
pulse

Communication
trouble area clear
command

Mode change
Change to
self-diagnosis
mode (MODE 2)

Execution of
operation mode
change request

7 - 10 7 - 10

7 PROGRAMMING
MELSEC-Q

Read of operation
mode change results

Read of present
operation mode

7 - 11 7 - 11

7 PROGRAMMING
MELSEC-Q

7.3 Extended Service Mode (MODE E) Using FROM/TO Instruction

using the FROM/TO instruction in the Extended service mode (MODE E).

Initial setting Slave error
information
cancel area
setting

Trouble no
information
time setting

Communication
trouble area
type (fixed type)

Read of input
start address

Transmission of
input start address
to Z0

Read of output
start address

Transmission of
output start
address to Z1

Initial output data
write

Communication
start

Normal
communication

Input area read

7 - 12 7 - 12

7 PROGRAMMING
MELSEC-Q



Write to output area

Trouble
information read

Trouble detection
signal reset
command pulse

Communication
trouble detection
signal reset

Communication
trouble area clear
command pulse

Communication
trouble area clear
command

7 - 13 7 - 13

7 PROGRAMMING
MELSEC-Q

Mode change
Change to
self-diagnosis
mode (MODE 2)

Execution of
operation mode
change request

Read of operation
mode change
results

Read of present
operation mode

7 - 14 7 - 14

7 PROGRAMMING
MELSEC-Q

7.4 Normal Service Mode (MODE 0) Using Dedicated Instruction

using the dedicated instruction for separation prevention in the Normal service mode
(MODE 0).

Initial setting Slave error
information
cancel
area setting

Trouble no
information time
setting

Communication
trouble area type
(fixed type)

Initial output
data write

Communication
start

Normal
communication

Effective setting of dedicated instructions

Input area read Read in which
separation is
prevented


7 - 15 7 - 15

7 PROGRAMMING
MELSEC-Q


Write to output area

Write in which
separation is
prevented

Processing against communication trouble Trouble
information
read

Trouble detection
signal reset
command pulse

Communication
trouble detection
signal reset

Communication
trouble area clear
command pulse

Communication
trouble area clear
command

7 - 16 7 - 16

7 PROGRAMMING
MELSEC-Q

Mode change
Change to
self-diagnosis
mode (MODE 2)

Execution of
operation mode
change request

Read of operation
mode change
results

Read of present
operation mode

7 - 17 7 - 17

7 PROGRAMMING
MELSEC-Q

7.5 Execution of Global Control

The following shows the program example added when the global control is executed.
The operation mode and I/O data read/write methods are not related to this program
example.

Use of global control function
Transmission of
SYNC command
to groups 1 and 2

Request for
global control

7 - 18 7 - 18

8 DEDICATED INSTRUCTIONS
MELSEC-Q

8. DEDICATED INSTRUCTIONS

8.1 BBLKRD Instruction

Usable devices
Internal device MELSECNET/H Special
Index
Set data (System, user) File Direct J function Constant
register Other
register module K, H
Bit Word Bit Word Z
U G
n1 — — — —
D — — — — —
n2 — — — —

[Instruction [Execution
symbol] condition]
Command
BBLKRD G.BBLKRD Un n1 D n2

Command
P.BBLKRD GP.BBLKRD Un n1 D n2

Setting Data
Setting
Detail Set Range Data Type
data
Un Module head I/O number of QJ71PB92D 0 to FFH
BIN16 bit
n1 Head address of data to be read Specified device area
D Head number of device in which read data is stored Specified device area Device name
n2 Number of reading data 1 to 1920 (1 to 780H) BIN16 bit
Function
The data is read from the buffer memory of the specified module with the signals
prevented from being separated.
Error
If the following event is encountered, an operation error will occur (Error code: 4101).
• A value out of the set range is set for the set data.
8
• The size of the data obtained by adding the number of data to be read to the head
address of the data to be read exceeds the buffer memory size.
• The number of data to be read for the head address and subsequent is less than the
number of reading data.
Program Example
Program for reading, with M10 = ON, the data amounting to 0 to 960 buffer memory
addresses of QJ71PB92D (module head I/O number: 0) to D0 to D959 with the signals
M10
GP.BBLKRD U0 K0 D0 K960

POINT
Execute BBLKRD and BBLKWR for each scanning, respectively.
If either of BBLKRD and BBLKWR is used, the transmission delay time will be
longer.

8-1 8-1

8 DEDICATED INSTRUCTIONS
MELSEC-Q

8.2 BBLKWR Instruction

Usable devices
Internal device MELSECNET/H Special
Index
Set data (System, user) File Direct J function Constant
register Other
register module K, H
Bit Word Bit Word Z
U G
n1 — — — —
S — — — — —
n2 — — — —

[Instruction [Execution
symbol] condition]
Command
BBLKWR G.BBLKWR Un n1 S n2

Command
P.BBLKWR GP.BBLKWR Un n1 S n2

Setting Data
Setting
Detail Set Range Data Type
data
Un Module head I/O number of QJ71PB92D 0 to FFH
BIN16 bit
n1 Head address for data writing Specified device area
S Head number of device in which write data is stored Specified device area Device name
n2 Number of writing data 1 to 960 (1 to 3C0H) BIN16 bit
Function
The data is written to the buffer memory of the specified module with the signals
Error
If the following event is encountered, an operation error will occur (Error code: 4101).
• A value out of the set range is set for the set data.
• The size of the data obtained by adding the number of data to be written to the head
8 address for data writing exceeds the buffer memory size.
• The number of data to be written for the head address and subsequent is less than
the number of writing data.
Program Example
Program for writing, with M10 = ON, the data amounting to 0 to 960 buffer memory
addresses of QJ71PB92D (module head I/O number: 0) to D0 to D959 with the signals
M10
GP.BBLKWR U0 K0 D0 K960

POINT
Execute BBLKRD and BBLKWR for each scanning, respectively.
If either of BBLKRD and BBLKWR is used, the transmission delay time will be
longer.

8-2 8-2

9 TROUBLESHOOTING
MELSEC-Q

9. TROUBLESHOOTING

For troubleshooting in the Normal service mode (MODE 0) and Extended service
mode (MODE E), the causes of errors, which are located using the status of LEDs, and
measures against the errors are described below.
When the operation is in the Normal service mode (MODE 0) or Extended service
mode (MODE E), the TEST LED indicator and PRM SET LED indicator of QJ71PB92D
go off.

LED Status Cause Corrective Action
RUN Goes OFF The watchdog timer monitoring Please consult your sales
time is exceeded. representative.
SD/RD Flashes at a There is a slave station with Please consult your sales
high rate which the initial communication representative.
cannot be performed
(The parameter does not match
the actual slave station).
TOKEN Goes OFF The token is not cycled. • Make sure that the PROFIBUS-
DP cable is connected.
• Check the terminating resistance
set switch for correct function.
• Make sure that the station
addresses are not overlapped
with each other.
• Make sure that the HSA does not
exceed the maximum station
address of the network.
PRM SET Flashes The parameter is not set. Set the parameters using the GX
Configurator-DP.
RSP ERR Goes ON A communication trouble occurs. Read the trouble information from
the communication trouble
information area of the buffer
memory.
FAULT Goes ON • An active slave station is not set Correct the parameters.
for the parameter. (If the FAULT LED indicator does
• A slave station having a station not go off even when the
address overlapped with that of parameters are corrected, contact
9
the master station is set for the the nearest branch.)
parameter.
• An unexpected error other than Please consult your sales
those specified above occurs. representative.

9-1 9-1

9 TROUBLESHOOTING
MELSEC-Q

MEMO

9

9-2 9-2

APPENDIX
MELSEC-Q

APPENDIX

Appendix 1 Differences between QJ71PB92D and AJ71PB92D/A1SJ71PB92D

The differences between QJ71PB92D of MELSEC-Q series and
AJ71PB92D/A1SJ71PB92D of MELSEC-A series are shown below.
The AJ71PB92D and A1SJ71PB92D to be used here are of software version C and
subsequent and software version G and subsequent, respectively.
For the modules of the software versions earlier than those stated above, refer to the
AJ71PB92D/A1SJ71PB92D type PROFIBUS-DP interface module user's manual (SH-
3330) to confirm the difference between these software versions.

(1) Functions and specifications
Model name
QJ71PB92D AJ71PB92D/A1SJ71PB92D
Item
Separation prevention
function (auto refresh, Present Absent
dedicated instruction)
Separation prevention
function Absent Present
(FROM/TO instruction)
Auto refresh setting Present Absent
Word data swap function Present Absent
Operation mode setting • GX Configurator-DP • Sequence program
method • Sequence program • Mode set switch
Read/write of parameters Connected to RS-232C interface
Connected to RS-232C interface
using configuration of QCPU (Q mode) or USB
of AJ71PB92D/A1SJ71PB92D.
software interface
via. MELSECNET/H and via. MELSECNET/10 and
Remote parameter setting
Ethernet Ethernet
SW05F-PROFIMAP
MELSEC-PROFIMAP 1.0
Compatible configuration
GX Configurator-DP MELSEC-PROFIMAP 2.0
software
MELSEC-PROFIMAP 3.0
GX Configurator-DP

App

Appendix - 1 Appendix - 1

APPENDIX
MELSEC-Q

Appendix 2 Extended Trouble Information of Mitsubishi's Slaves

(1) AJ95TB2-16T
AJ95TB2-16T notifies device-related trouble information to the master. The
information consists of seven bytes including the header (one byte) as shown
below:

07H xxH 00H 00H 00H 00H 00H

Header Always set to 00H
(Fixed to 07H)

b7 b6 b5 b4 b3 b2 b1 b0

Set to 1 when the external power supply COM1t is
Always set to 0
not supplied
Set to 1 when the external power supply COM2t is
not supplied

(2) AJ95TB32-16DT
AJ95TB32-16DT notifies device-related trouble information to the master. The
below:

07H xxH 00H 00H 00H 00H 00H

(Fixed to 07H)

b7 b6 b5 b4 b3 b2 b1 b0

Always set to 0 Set to 1 when the external power supply COM1t is
not supplied

(3) AJ95TB3-16D
AJ95TB3-16D notifies device-related trouble information to the master. The
below:

07H 00H 00H 00H 00H 00H 00H
App
(Fixed to 07H)


APPENDIX
MELSEC-Q

Appendix 3 Outline Drawings

2(0.08)
QJ71PB92D
RUN TEST
SD/RD TOKEN
READY PRM SET
RPS ERR. FAULT

98(38.6)

105(4.14)
BUS TERMINATION
OFF ON
PROFIBUS I/F

QJ71PB92D

5(0.2)
2(0.08) 91(3.59) 4.3(0.17) 27.4(1.08)
97.3(3.83)
Unit : mm (inch)


APPENDIX
MELSEC-Q

MEMO


INDEX

Ind
[A] [E]
AJ71PB92D/A1SJ71PB92D .............. Appendix-1 Error code.............................................3-20, 21
Areas [G]
Address information area .......................... 3-17 Group...............................................................4- 3
Communication trouble area..................... 3-19 GSD file ...........................................................5- 2
Current operation mode area.................... 3-32 GX Configurator-DP........................... 2- 1, 5- 1, 2
Extended communication trouble area ..... 3-22
Global control area .................................... 3-29 [L]
Input area................................................... 3-13 LED..................................................... 5- 7, 8, 9- 1
Input/output start address area ................. 3-31
Local station address display area ........... 3-33 [M]
Operation mode change request area.............. MODE
................................................................... 3-32 MODE 0..............................3-13, 15, 4-12, 5- 1
Operation mode change result area ................. MODE 1......................................................4-11
................................................................... 3-32 MODE 2............................................. 4-11, 5- 1
Output area................................................ 3-15 MODE E .............................3-14, 16, 4-13, 5- 1
Self-diagnosis status code area................ 3-33
Slave station trouble information cancel area .. [P]
................................................................... 3-28 Parameters......................................................5- 2
Slave status area....................................... 3-30 Procedures
Trouble information unnotification time Parameter setting procedure ......................5- 2
setting area ................................................ 3-30 Procedures before operation ......................5- 1
PROFIBUS cable...........................................5-10
[B] PROFIBUS-DP ...........................................1- 1, 2
Baud rate ................................................ 3- 1, 6- 2 RS-232 cable ............................. 5- 2, Appendix-1
BBLKRD ................................................ 4-10, 8- 1
BBLKWR ............................................... 4-10, 8- 2 [S]
Bus cycle time ............................................ 6- 1, 2 Self-diagnosis
Procedure for self-diagnosis .......................5- 9
[C] Self-diagnosis mode ...................................5- 9
Configuration Separation.............................................. 1- 2, 4- 8
Multimaster configuration ........................... 3- 6 SYNC ..............................................................4- 3
Network configuration................................. 3- 2 Swap....................................................... 1- 2, 4- 6
System configuration.................................. 2- 1
Configurator software ................................. 2- 1 [T]
Connectors Transmission delay time.................................6- 4
Pin arrangement of connectors................. 5-10
PROFIBUS interface connector................. 5- 8 [U]
CPU ................................................................ 2- 1 UNSYNC .........................................................4- 3
USB cable ..........................2- 2, 5- 2, Appendix-1
[D]
DDB file....................................................... 5- 2

Index - 1 Index - 1

WARRANTY
Please confirm the following product warranty details before starting use.

1. Gratis Warranty Term and Gratis Warranty Range
If any faults or defects (hereinafter "Failure") found to be the responsibility of Mitsubishi occurs during use of the product
within the gratis warranty term, the product shall be repaired at no cost via the dealer or Mitsubishi Service Company.
Note that if repairs are required at a site overseas, on a detached island or remote place, expenses to dispatch an
engineer shall be charged for.
[Gratis Warranty Term]
The gratis warranty term of the product shall be for one year after the date of purchase or delivery to a designated
place.
Note that after manufacture and shipment from Mitsubishi, the maximum distribution period shall be six (6) months, and
the longest gratis warranty term after manufacturing shall be eighteen (18) months. The gratis warranty term of repair
parts shall not exceed the gratis warranty term before repairs.
[Gratis Warranty Range]
(1) The range shall be limited to normal use within the usage state, usage methods and usage environment, etc.,
which follow the conditions and precautions, etc., given in the instruction manual, user's manual and caution labels
on the product.
(2) Even within the gratis warranty term, repairs shall be charged for in the following cases.
1. Failure occurring from inappropriate storage or handling, carelessness or negligence by the user. Failure caused
by the user's hardware or software design.
2. Failure caused by unapproved modifications, etc., to the product by the user.
3. When the Mitsubishi product is assembled into a user's device, Failure that could have been avoided if functions
or structures, judged as necessary in the legal safety measures the user's device is subject to or as necessary
by industry standards, had been provided.
4. Failure that could have been avoided if consumable parts (battery, backlight, fuse, etc.) designated in the
instruction manual had been correctly serviced or replaced.
5. Failure caused by external irresistible forces such as fires or abnormal voltages, and Failure caused by force
majeure such as earthquakes, lightning, wind and water damage.
6. Failure caused by reasons unpredictable by scientific technology standards at time of shipment from Mitsubishi.
7. Any other failure found not to be the responsibility of Mitsubishi or the user.

2. Onerous repair term after discontinuation of production
(1) Mitsubishi shall accept onerous product repairs for seven (7) years after production of the product is discontinued.
Discontinuation of production shall be notified with Mitsubishi Technical Bulletins, etc.
(2) Product supply (including repair parts) is not possible after production is discontinued.

3. Overseas service
Overseas, repairs shall be accepted by Mitsubishi's local overseas FA Center. Note that the repair conditions at each FA
Center may differ.

4. Exclusion of chance loss and secondary loss from warranty liability
Regardless of the gratis warranty term, Mitsubishi shall not be liable for compensation to damages caused by any cause
found not to be the responsibility of Mitsubishi, chance losses, lost profits incurred to the user by Failures of Mitsubishi
products, damages and secondary damages caused from special reasons regardless of Mitsubishi's expectations,
compensation for accidents, and compensation for damages to products other than Mitsubishi products and other duties.

5. Changes in product specifications
The specifications given in the catalogs, manuals or technical documents are subject to change without prior notice.

6. Product application
(1) In using the Mitsubishi MELSEC programmable logic controller, the usage conditions shall be that the application will
not lead to a major accident even if any problem or fault should occur in the programmable logic controller device, and
that backup and fail-safe functions are systematically provided outside of the device for any problem or fault.
(2) The Mitsubishi general-purpose programmable logic controller has been designed and manufactured for applications
in general industries, etc. Thus, applications in which the public could be affected such as in nuclear power plants and
other power plants operated by respective power companies, and applications in which a special quality assurance
system is required, such as for Railway companies or National Defense purposes shall be excluded from the
programmable logic controller applications.
Note that even with these applications, if the user approves that the application is to be limited and a special quality is
not required, application shall be possible.
When considering use in aircraft, medical applications, railways, incineration and fuel devices, manned transport
devices, equipment for recreation and amusement, and safety devices, in which human life or assets could be greatly
affected and for which a particularly high reliability is required in terms of safety and control system, please consult
with Mitsubishi and discuss the required specifications.

PROFIBUS-DP Interface Module
User's Manual

MODEL QJ71PB92D-U-S-E

MODEL 13JR22
CODE

SH(NA)-080127-B(0105)MEE

HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100-8310 TELEX : J24532 CABLE MELCO TOKYO
NAGOYA WORKS : 1-14 , YADA-MINAMI 5 , HIGASHI-KU, NAGOYA , JAPAN

When exported from Japan, this manual does not require application to the
Ministry of Economy, Trade and Industry for service transaction permission.

Specifications subject to change without notice.

Profibus Dp Interface Module Users Manual Qj71 Pb92 D Sh Na 0

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