Mitsubishi Electric QJ71MT91 User manual

MODBUS/TCP Interface Module User's Manual
-QJ71MT91
-GX Configurator-MB (SW1D5C-QMBU-E)

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SAFETY PRECAUTIONS 
(Always read these instructions before using this equipment.)
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 user's manual of the CPU module to use.
In this manual, the safety precautions are classified into two levels: " WARNING" and " CAUTION".
Under some circumstances, failure to observe the precautions given under " CAUTION" may lead to
serious consequences.
Observe the precautions of both levels because they are important for personal and system safety.
Make sure that the end users read this manual and then keep the manual in a safe place for future
reference.
[Design Precautions]
WARNING
When connecting a peripheral with the CPU module or connecting a personal computer with an
intelligent function module to modify data of a running programmable controller, configure an
interlock circuit in the sequence program to ensure that the entire system will always operate
safely. For other forms of control (such as program modification, parameter change, forced
output, or operating status change) of a running programmable controller, read the relevant
manuals carefully and ensure that the operation is safe before proceeding.
Especially in the above mentioned control operations that are performed from an external
device to a remote programmable controller, any problems on the programmable controller side
may not be dealt with promptly due to a data communication error. To prevent this, configure an
interlock circuit in the sequence program, and determine corrective actions to be taken between
the external device and programmable controller in case of a communication failure.
Do not write any data in the "system area (Use prohibited)" of the buffer memory of the
intelligent function module. Also, do not output (turn on) the "use prohibited" signal, which is one
of the output signals from the programmable controller CPU to the intelligent function module. If
data is written to the "system area (Use prohibited)" or the "use prohibited" signal is output, there
is a risk that the programmable controller system may malfunction.

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CAUTION
Do not bundle the control wires and the communication cables with the main circuit and the
power wires, and do not install them close to each other. They should be installed at least 100
mm (3.94 in.) away from each other. Failure to do so may generate noise that may cause
malfunctions.
[Installation Precautions]
CAUTION
Be sure to shut off all phases of the external power supply used by the system before mounting
or removing the module.
Failure to do so may damage the module.
Use the programmable controller in the operating environment that meets the general
specifications described in the user's manual of the CPU Module to use. Using the
programmable controller in any other operating environments may cause electric shocks, fires
or malfunctions, or may damage or degrade the module.
To mount the module, while pressing the module mounting lever located in the lower part of the
module, fully insert the module fixing projection(s) into the hole(s) in the base unit and press the
module until it snaps into place.
Incorrect module mounting may cause a malfunction, failure, or drop of the module.
In an environment of frequent vibrations, secure the module with the screw.
Be sure to tighten the screws using the specified torque. If the screws are loose, it may cause
the module to short-circuit, malfunction or fall off. If the screws are tightened excessively, it may
damage the screws and cause the module to short-circuit, malfunction or fall off.
Do not directly touch any conductive part or electronic component of the module.
Doing so may cause a malfunction or failure of the module.
[Wiring Precautions]
WARNING
Shut off the external power supply (all phases) used in the system before wiring.
Failure to do so may result in electric shock or damage to the product.

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CAUTION
Connectors for external connection must be crimped or pressed with the tool specified by the
manufacturer, or must be correctly soldered.
Incomplete connections could result in short circuit, fire, or malfunction.
Securely connect the connector to the module. Failure to do so may cause malfunction.
Place the cables in a duct or clamp them. If not, dangling cable may swing or inadvertently be
pulled, resulting in damage to the module or cables or malfunction due to poor contact.
In addition, the weight of the cables may put stress on modules in an environment of strong
vibrations and shocks.
Before connecting the cables, check the type of interface to be connected.
Connecting or erroneous wiring to the wrong interface may cause failure to the module and
external devices.
When disconnecting the cable from the module, do not pull the cable by the cable part.
For the cable with connector, hold the connector part of the cable.
Pulling the cable connected to the module may result in malfunction or damage to the module or
cable.
Be careful not to let any foreign matter such as wire chips get inside the module.
They may cause fire, as well as breakdowns and malfunctions of the module.
A protective film is attached to the top of the module to prevent foreign matter, such as wire
chips, from entering the module during wiring.
Do not remove this protective sheet during wiring work. However, be sure to remove the
protective sheet before operating the module to allow heat radiation during operation.
[Setup and Maintenance Precautions]
WARNING
Do not touch the terminals while the power is on. Doing so will cause electric shock or
malfunction.
Before cleaning the module or retightening the module mounting screws, make sure to shut off
all phases of the external power supply used by the system. Failure to do so may cause the
module to electric shocks, breakdown or malfunction.

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CAUTION
Before performing online operations (especially, program modification, forced output or
operating status change) by connecting a peripheral device to a running CPU, read the manual
carefully and ensure the safety. Incorrect operation will cause mechanical damage or accidents.
Never disassemble or modify the module. This may cause breakdowns, malfunctions, injuries or
fire.
When using a wireless communication device such as a cellular phone, keep a distance of 25cm
(9.85 inch) or more from the programmable controller in all directions. Failure to do so can
cause a malfunction.
Before mounting/dismounting the module, be sure to shut off all phases of the external power
supply used by the system. Failure to do so may cause module failure or malfunctions.
After the first use of the product, do not mount/remove the module to/from the base unit more
than 50 times ((IEC 61131-2/JIS B 3502 compliant).
Failure to do so may cause malfunction.
Before handling the module, touch a conducting object such as a grounded metal to discharge
the static electricity from the human body.
Failure to do so may cause a failure or malfunctions of the module.
[Operating Precautions]
CAUTION
When changing data and operating status, and modifying program of the running programmable
controller from an external device such as a personal computer connected to an intelligent
function module, read relevant user's manuals carefully and ensure the safety before operation.
Incorrect modifications of data, programs and operating status may cause system malfunctions,
damages to the machines, or accidents.
[Disposal Precautions]
CAUTION
Dispose of this product as an industrial waste.

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CONDITIONS OF USE FOR THE PRODUCT 

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REVISIONS
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Jan., 2004 SH (NA) -080446ENG-A First Edition
Mar., 2004 SH (NA) -080446ENG-B Modifications
Section 7.2.2, 8.3.2, 8.4, 8.6, 8.7, 9.2.2, 11.1, 11.4, 11.5
Nov., 2005 SH (NA) -080446ENG-C Modifications
Section 4.3.10, 5.2.1, 6.1, 6.2, 6.6, 7.1, 7.3.1, 7.4.1 to 7.4.5, 8.2.2,
8.3.1, 8.3.3, 8.7.2, 9.1, 10.2, 10.3, 11.1, 11.2, 11.3.2, 11.3.3, 11.4
Feb., 2006 SH (NA) -080446ENG-D Modifications
Section 2.1, 2.4, 10.1
Jan., 2008 SH (NA) -080446ENG-E Modifications
SAFETY PRECAUTIONS, Conformation to the EMC Directive and
Low Voltage Instruction, About the Generic Terms and
Abbreviations, Section 2.1, 2.5, 3.1, 3.2.1, 5.1, 5.2.1, 5.5, 6.1, 6.4,
6.6, 7.2.2, 7.4.1, 7.4.2, 7.4.4, Chapter 8, Section 9.1.3, 9.3.1, 9.3.2,
9.3.3, 10.2, 10.3, 11.1, 11.2, 11.3.1, 11.3.3, 11.4.1, 11.4.2, 11.5.1
Addition
Section 2.4
May, 2008 SH (NA) -080446ENG-F Change of a term
"PLC" was changed to "programmable controller".
Modifications
SAFETY PRECAUTIONS, Compliance with the EMC and Low
Voltage Directives, About the Generic Terms and Abbreviations,
Section 2.1, 3.1, 6.1, 6.6, 7.4.2, 8.2.1, 8.3.1, 8.3.3, 8.6, 10.2, 10.3,
11.2, 11.3.3, Appendix 3
Nov., 2010 SH (NA)-080446ENG-G Modifications
SAFETY PRECAUTIONS, About the Generic Terms and
Abbreviations, Section 2.1, 2.5, 6.3, 6.6, 8.2.1, 11.2, Appendix,
WARRANTY
Addition
CONDITIONS OF USE FOR THE PRODUCT

A
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The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Oct., 2014 SH (NA)-080446ENG-H Modifications
COMPLIANCE WITH THE EMC AND LOW VOLTAGE
DIRECTIVES, ABOUT THE GENERIC TERMS AND
ABBREVIATIONS, MEANINGS AND DEFINITIONS OF TERMS,
Chapter 1, Section 2.1, 2.2, 2.4, 2.5, 3.1, 3.3.1, 4.3, 4.3.12, 5.1, 6.2,
6.3, 6.5.1, 6.5.2, 6.6, 6.6.1, 7.1, 7.2.2, 7.3.1, 7.4.2, 7.4.4, 8.2.1,
8.2.2, 8.6, 9.1.1, 9.2.2, 9.2.3, 9.3.2, 9.3.3, 10.2, 10.3, 11.1,
11.2,11.3.2, 11.3.3, Appendix 1
Addition
Appendix 2
Change
Appendix 2→Appendix 3, Appendix 3→Appendix 4
Jun., 2019 SH (NA)-080446ENG-I Modifications
SAFETY PRECAUTIONS, Section 2.1, 2.2, 3.1, 4.3.7, 4.3.8, 4.3.10,
4.3.12, 5.2.1, 5.2.2, 5.6, 6.1, 6.4, 7.2.2, 8.3.1, 10.2, 11.1,
WARRANTY
Japanese Manual Version SH(NA)-080445-K
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.
2004 MITSUBISHI ELECTRIC CORPORATION

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INTRODUCTION
Thank you for purchasing the Mitsubishi Electric MELSEC-Q series programmable controller.
Before using the equipment, please read this manual carefully to develop full familiarity with the functions
and performance of the Q series programmable controller you have purchased, so as to ensure correct use.
CONTENTS
SAFETY PRECAUTIONS...............................................................................................................................A- 1
CONDITIONS OF USE FOR THE PRODUCT ..............................................................................................A- 5
REVISIONS.....................................................................................................................................................A- 6
INTRODUCTION.............................................................................................................................................A- 8
CONTENTS.....................................................................................................................................................A- 8
COMPLIANCE WITH THE EMC AND LOW VOLTAGE DIRECTIVES.......................................................A-12
THE MANUAL'S USAGE AND STRUCTURE..............................................................................................A-12
ABOUT THE GENERIC TERMS AND ABBREVIATIONS...........................................................................A-14
MEANINGS AND DEFINITIONS OF TERMS...............................................................................................A-15
PRODUCT CONFIGURATION .....................................................................................................................A-15
1 OVERVIEW 1- 1 to 1- 5
1.1 Features .................................................................................................................................................... 1- 1
2 SYSTEM CONFIGURATION 2- 1 to 2-10
2.1 Applicable Systems................................................................................................................................... 2- 1
2.2 Devices Necessary for Network Configuration ........................................................................................ 2- 3
2.3 System Configuration and Access Range ............................................................................................... 2- 5
2.4 Precautions for System Configuration...................................................................................................... 2- 7
2.5 Checking Function Version and Software Version .................................................................................. 2- 8
3 SPECIFICATIONS 3- 1 to 3-10
3.1 Performance Specifications...................................................................................................................... 3- 2
3.2 I/O Signals for Programmable Controller CPU ........................................................................................ 3- 3
3.2.1 I/O signal list ....................................................................................................................................... 3- 3
3.3 Applications and Assignment of Buffer Memory...................................................................................... 3- 5
3.3.1 Buffer memory list .............................................................................................................................. 3- 5
4 MODBUS STANDARD FUNCTIONS 4- 1 to 4-20
4.1 MODBUS Standard Function Support List............................................................................................... 4- 1
4.2 Frame Specifications ................................................................................................................................ 4- 3
4.3 PDU Formats by Functions ...................................................................................................................... 4- 4
4.3.1 Read coils (FC: 01) ............................................................................................................................ 4- 6
4.3.2 Read discrete inputs (FC: 02)............................................................................................................ 4- 7
4.3.3 Read holding registers (FC: 03)......................................................................................................... 4- 8
4.3.4 Read input registers (FC: 04) ............................................................................................................ 4- 9
4.3.5 Write single coil (FC: 05)................................................................................................................... 4-10
4.3.6 Write single register (FC: 06) ............................................................................................................ 4-11
4.3.7 Write multiple coils (FC: 15).............................................................................................................. 4-12