Mitsubishi MELSEC Q Series User manual

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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 MELSEC communication protocol. For the safety
instructions of the programmable controller system, please read the user's manual for the CPU module to
use.
In this manual, the safety instructions are ranked as " !WARNING" and " !CAUTION".
Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in minor or moderate injury or property 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]
!WARNING
When changing data of the running programmable controller from a peripheral connected to the
CPU module or from a personal computer connected to an intelligent function module, configure
an interlock circuit in the sequence program to ensure that the entire system will always operate
safely.
For program modification and operating status change, read relevant manuals carefully and
ensure the safety before operation.
Especially, when a remote programmable controller is controlled by an external device,
immediate action cannot be taken if a problem occurs in the programmable controller due to a
communication failure.
To prevent this, configure an interlock circuit in the sequence program, and determine corrective
actions to be taken between the external device and CPU module in case of a communication
failure.
Do not write any data to the "system area" of the buffer memory in the intelligent function
module.
Also, do not use any "use prohibited" signals as an output signal from the programmable
controller CPU to the intelligent function module.
Doing so may cause malfunction of the programmable controller system.
!WARNING
!CAUTION

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[Operation Precautions]
!CAUTION
When changing data and operating status, and modifying program of the running programmable
controller from a personal computer connected to an intelligent function module, read relevant
manuals carefully and ensure the safety before operation.
Incorrect change or modification may cause system malfunction, damage to the machines, or
accidents.
While set values in the buffer memory are being registered to the flash ROM in the module, do
not turn off the power to the module and do not reset the CPU module.
Doing so will affect the flash ROM data, and setting to the buffer memory and registration to the
flash ROM need to be performed again.
Also, it may cause failure or malfunction of the module.

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CONDITIONS OF USE FOR THE PRODUCT 
(1) Mitsubishi programmable controller ("the PRODUCT") shall be used in conditions;
i) where any problem, fault or failure occurring in the PRODUCT, if any, shall not lead to any major or
serious accident; and
ii) where the backup and fail-safe function are systematically or automatically provided outside of the
PRODUCT for the case of any problem, fault or failure occurring in the PRODUCT.
(2) The PRODUCT has been designed and manufactured for the purpose of being used in general
industries.
MITSUBISHI SHALL HAVE NO RESPONSIBILITY OR LIABILITY (INCLUDING, BUT NOT LIMITED
TO ANY AND ALL RESPONSIBILITY OR LIABILITY BASED ON CONTRACT, WARRANTY, TORT,
PRODUCT LIABILITY) FOR ANY INJURY OR DEATH TO PERSONS OR LOSS OR DAMAGE TO
PROPERTY CAUSED BY the PRODUCT THAT ARE OPERATED OR USED IN APPLICATION NOT
INTENDED OR EXCLUDED BY INSTRUCTIONS, PRECAUTIONS, OR WARNING CONTAINED IN
MITSUBISHI'S USER, INSTRUCTION AND/OR SAFETY MANUALS, TECHNICAL BULLETINS AND
GUIDELINES FOR the PRODUCT.
("Prohibited Application")
Prohibited Applications include, but not limited to, the use of the PRODUCT in;
Nuclear Power Plants and any other power plants operated by Power companies, and/or any other
cases in which the public could be affected if any problem or fault occurs in the PRODUCT.
Railway companies or Public service purposes, and/or any other cases in which establishment of a
special quality assurance system is required by the Purchaser or End User.
Aircraft or Aerospace, Medical applications, Train equipment, transport equipment such as Elevator
and Escalator, Incineration and Fuel devices, Vehicles, Manned transportation, Equipment for
Recreation and Amusement, and Safety devices, handling of Nuclear or Hazardous Materials or
Chemicals, Mining and Drilling, and/or other applications where there is a significant risk of injury to
the public or property.
Notwithstanding the above, restrictions Mitsubishi may in its sole discretion, authorize use of the
PRODUCT in one or more of the Prohibited Applications, provided that the usage of the PRODUCT is
limited only for the specific applications agreed to by Mitsubishi and provided further that no special
quality assurance or fail-safe, redundant or other safety features which exceed the general
specifications of the PRODUCTs are required. For details, please contact the Mitsubishi
representative in your region.

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REVISIONS
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Dec., 1999 SH(NA)-080008-A First edition
Oct., 2000 SH(NA)-080008-B Reflect the contents of the function version B.
Put Windowsbase software products together from Mitsubishi
Programmable Controller MELSEC series to Mitsubishi integrated FA
software MELSOFT series. Standardize the name from software package
(GPP function) to product name (GX Developer).
Correction
Contents, Entire manual (change MELSECNET/10H to
MELSECNET/H), About Manuals, About the Generic Terms and
Abbreviations, Section 1.1(5), Section 2.2, 2.4, 2.6, 2.7 (g), 2.9, 2.10,
Section 3.1.1, 3.1.2 (figure), 3.1.3, 3.1.4 (figure), 3.1.5 (figure), 3.1.6
(5), REMARKS, 3.2 (table), 3.3.1 (table 6.3), 3.3.8 (POINT (screen)),
3.8.1 (2)(a), 3.8.2 (4), 3.8.5, 3.8.6, Section 4.1 (figure), Section 5.1.1,
5.1.2 (figure), 5.1.3, 5.1.5 (table)*3, 5.2.1 (2) (table), 5.2.8, 5.4.2, 5.4.3,
Section 6.1.1, 6.1.2 (figure), 6.1.3, 6.2*3 (table), 6.3.1 (2) (table), 6.3.8
POINT (3), 6.4.9POINT (3), Appendix 1, 2
Jun., 2001 SH(NA)-080008-C Standardize the name from utility package (QSCU) to product name (GX
Configurator-SC).
Correction
About Manuals, The Manual's Use and Structure, About the Generic
Terms and Abbreviations, Meanings and Descriptions of Terminology,
Section 1.1(5), Section 2.2(table), 2.6.1(1)(table), 2.6.2(table), 2.10(4),
Section 3.2(table), 3.3.1(table), 3.3.2, 3.3.3, 3.3.7, 3.3.8(2)(3),
3.3.9(2)(3)(4), 3.3.10(4), 3.4.3, 3.5, 3.6, 3.8.5(2), 3.8.16, 3.17.2, Section
4.4, Section 5.2.8(2)POINT, 5.5, Section 6.2 3, 6.3.1(2), Appendix 3.1
Addition
Section 2.11
Jan., 2003 SH(NA)-080008-D
Additional model
QJ71C24N,QJ71C24N-R2, QJ71C24N-R4
Correction
The Manual's Use and Structure, About the Generic Terms and
Abbreviations, Section 1.1(5), Section 2.5(3), 2.6.1, 2.8, Section
3.1.2(1)(5), 3.1.3(3), 3.2, 3.3.1, 3.3.10(5)POINT, 3.5.2, 3.6.1POINT,
3.6.7, 3.13, Section 5.1.5, 5.2.1POINT, 6.1.2(1)
Apr., 2003 SH(NA)-080008-E
Additional model
QJ71E71-B5
Deleted model
QJ71E71
Correction
About the Generic Terms and Abbreviations, Section 2.6.1(2), Section
3.5.2, Section 6.1.3(4)
Jun., 2004 SH(NA)-080008-F
Correction
About the Generic Terms and Abbreviations, Section 2.6.1, 2.6.3,
2.10(4)(b), 3.1.3(2)(3), 3.1.6(5), 3.2, 3.3.1(3), 3.5.2(1), 3.6.7, 3.8.1,
3.8.11 POINT, Section 6.1.3(4), 6.3.1(2)

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The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Aug., 2005 SH(NA)-080008-G
Correction
About the Generic Terms and Abbreviations, Meanings and
Descriptions of Terminology, Section 2.7, Section 3.3.2 POINT
Addition
Chapter 3 (4E frame)
Jun., 2006 SH(NA)-080008-H
Correction
Section 3.2, 3.3.1, 3.3.8, 3.3.9, 3.5.2
Jul., 2007 SH(NA)-080008-I
Change of a term
"PLC" was changed to "programmable controller".
Correction
About the Generic Terms and Abbreviations, Section 1.2(2), Section
2.2, 2.4, 2.6.1, 2.6.2, 2.6.3, 2.9, 2.10(2)(4), Section 3.1.3(1), 3.1.6(5),
3.2*11, 3.3.1(3), 3.5.2(1), 3.13.1, 3.6.7, Section 5.1.3(4), Section
6.1.3(3), 6.3.1(2), Appendix 3.1
Nov., 2007 SH(NA)-080008-J
Correction
Section 1.1(5), 2.1(3), 2.6.1(1), 3.5.2, 5.1.5, 5.2.1(2), 6.2
Aug., 2008 SH(NA)-080008-K
Correction
About the Generic Terms and Abbreviations, Section 1.1, 1.2, Section
2.1, 2.2, 2.4 to 2.6, 2.8 to 2.11, 3.1.3, 3.1.6, 3.2, 3.3.1 to 3.3.10, 3.5.2,
3.6.7, 3.18, Section 5.1.3, 5.1.5, 5.2.1, Section 6.1.3, 6.2, 6.3.1,
Appendix 1, 1.2, 1.3, 2
Addition
Section 2.12
Feb., 2009 SH(NA)-080008-L
Correction
About the Generic Terms and Abbreviations, Section 2.1(3), 2.6.1,
Section 3.2*12, 3.5.2, 3.6.7, Section 5.1.5*7, 5.2.1, Section 6.2*7,
6.3.1*2
Jan., 2010 SH(NA)-080008-M
Additional model
LJ71C24, LJ71C24-R2
Correction
SAFETY PRECAUTIONS, RELEVANT MANUALS,
MANUAL PAGE ORGANIZATION,
GENERIC TERMS AND ABBREVIATIONS, TERMS, Section 2.6.1,
Section 3.1.6, 3.2, 3.3.1, 3.6.7, 3.8.1, 3.8.6, 3.8.7, 3.8.10, 3.8.12,
3.8.13, 3.8.15, 3.11.1, 3.13.1, Section 5.1.5, Appendix 1.3, 3.1
Addition
CONDITIONS OF USE FOR THE PRODUCT
Apr., 2010 SH(NA)-080008-N
Correction
GENERICTERMS AND ABBREVIATIONS, Section 1.1, 2.2, 2.6, 2.6.3,
2.9 to 2.11, 3.1.3, 3.1.6, 3.2, 3.3.2 to 3.3.10, 3.6.7, 5.1.3, 6.1.3, Appendix
1.3, 2

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The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
May, 2011 SH(NA)-080008-O
Correction
Section 2.1, 2.2, 2.6.1, 2.7.2, 3.1.3, 3.1.6, 3.2, 3.6.1, 3.7.3, 3.8, 3.8.1,
3.8.2, 3.8.9, 3.8.10, 3.8.11, 3.8.12, 3.8.13, 3.9.2, 3.9.3, 3.14, 4.3, 5.1.3,
5.1.5, Appendix 1.2
Jul., 2011 SH(NA)-080008-P
Correction
Section 1.1, 2.6.1, 2.11, 3.6.7, 5.2.1, 6.3.1
Oct., 2011 SH(NA)-080008-Q
Correction
Section 2.4, 2.6.1, 2.7.2, 2.8, 2.10, 2.12, 3.2, 3.3.1, 3.4.1, 3.11.1,
3.11.2, 3.18, 6.1.3, 6.2, 6.3.1, Appendix 3.1
Feb., 2013 SH(NA)-080008-R
Additional model
LJ71E71-100
Correction
RELEVANT MANUALS, GENERIC TERMS AND ABBREVIATIONS,
TERMS, Section 2.6.1, 2.7.1, 3.2, 3.3.1, 3.6.7, 3.8.1, 3.8.7, 3.8.12,
3.8.13, 3.8.15, 6.2, Appendix 1.2, 3.1
Japanese Manual Version SH-080003-X
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.
1999 MITSUBISHI ELECTRIC CORPORATION

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INTRODUCTION
Thank you for purchasing the MELSEC-Q/L series programmable controller.
This manual describes the functions of the MELSEC-Q/L series programmable controllers.
Before using this product, please read this manual and the relevant manuals carefully and develop familiarity
with the functions and performance of the MELSEC-L series programmable controller to handle the product
correctly.
Please always forward this manual to the end user.
CONTENTS
SAFETY PRECAUTIONS ........................................................................................................................A- 1
CONDITIONS OF USE FOR THE PRODUCT .......................................................................................A- 3
REVISIONS ..............................................................................................................................................A- 4
INTRODUCTION......................................................................................................................................A- 7
RELEVANT MANUALS............................................................................................................................A- 13
MANUAL PAGE ORGANIZATION ..........................................................................................................A- 15
GENERIC TERMS AND ABBREVIATIONS ...........................................................................................A- 17
TERMS .....................................................................................................................................................A- 19
1 OVERVIEW 1- 1 to 1- 4
1.1 Overview of the MELSEC Communication Protocol............................................................................ 1- 1
1.2 Features of the MELSEC Communication Protocol ............................................................................ 1- 3
2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL 2- 1 to 2- 34
2.1 Types and Applications of Data Communication Frames ................................................................... 2- 1
2.2 Accessible Range of Each Data Communication Frames .................................................................. 2- 3
2.3 How to Read the Control Procedures of the MC Protocol................................................................... 2- 5
2.4 Access Timing of the Programmable Controller CPU Side................................................................. 2- 6
2.5 Setting Method for Writing to the Programmable Controller CPU during RUN .................................. 2- 8
2.6 Accessing Other Stations ..................................................................................................................... 2- 9
2.6.1 Accessible programmable controllers of other stations ................................................................ 2- 9
2.6.2 Example of accessible station when each frame is used ............................................................. 2- 12
2.6.3 Example of designating data items for accessing other station designated within each data
communication frame .................................................................................................................... 2- 16
2.7 Precautions on Data Communication................................................................................................... 2- 19
2.7.1 When using E71 ............................................................................................................................. 2- 19
2.7.2 When using C24............................................................................................................................. 2- 21
2.8 Time Chart and Communication Time of the Transmission Sequence of
the Serial Communication Module ....................................................................................................... 2- 22
2.9 Transmission Time When Accessing Other Stations via CC-Link IE Controller Network,
CC-Link IE Field Network, MELSECNET/H, MELSECNET/10........................................................... 2- 25
2.10 Compatibility with Multiple CPU Systems .......................................................................................... 2- 28
2.11 Compatibility with the Serial Communication Function in the CPU Module ..................................... 2- 32
2.12 Compatibility with Programmable Controller CPU with Built-In Ethernet Port.................................. 2- 34

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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
3- 1 to 3- 303
3.1 Message Formats ................................................................................................................................. 3- 2
3.1.1 How to read the command description sections ........................................................................... 3- 2
3.1.2 Message format and control procedures of QnA compatible 3E frame and 4E frame................ 3- 3
3.1.3 Data designation items for QnA compatible 3E frame and 4E frame .......................................... 3- 13
3.1.4 Message formats and control procedures of QnA compatible 3C frame ..................................... 3- 16
3.1.5 Message formats and control procedures of QnA compatible 4C frame ..................................... 3- 25
3.1.6 Data designation items for QnA compatible 3C/4C frames.......................................................... 3- 36
3.1.7 Character area transmission data ................................................................................................. 3- 49
3.2 List of Commands and Functions for the QnA Compatible 3E/3C/4C Frames and 4E Frame.......... 3- 54
3.3 Device Memory Read/Write.................................................................................................................. 3- 62
3.3.1 Commands, character area contents and device range............................................................... 3- 62
3.3.2 Multiple block batch read and batch write ..................................................................................... 3- 76
3.3.3 Batch read in bit units (command: 0401)....................................................................................... 3- 85
3.3.4 Batch write in bit units (command: 1401) ...................................................................................... 3- 87
3.3.5 Random write in bit units (test) (command: 1402) ........................................................................ 3- 89
3.3.6 Batch read in word units (command: 0401) .................................................................................. 3- 91
3.3.7 Batch write in word units (command: 1401) .................................................................................. 3- 95
3.3.8 Random write in word units (test) (command: 1402) .................................................................... 3- 99
3.3.9 Random read in word units (command: 0403).............................................................................. 3-102
3.3.10 Monitoring device memory........................................................................................................... 3-120
3.4 Buffer Memory Read/Write ................................................................................................................... 3-129
3.4.1 Commands and buffer memory..................................................................................................... 3-129
3.4.2 Reading buffer memory (command: 0613) ................................................................................... 3-131
3.4.3 Writing to buffer memory (command: 1613).................................................................................. 3-133
3.5 Reading from and Writing to the Buffer Memory of an Intelligent Function Module ........................... 3-134
3.5.1 Commands and buffer memory..................................................................................................... 3-134
3.5.2 Accessible intelligent function modules......................................................................................... 3-139
3.5.3 Reading the buffer memory of an intelligent function module (command: 0601) ........................ 3-141
3.5.4 Writing to the buffer memory of an intelligent function module (command: 1601) ...................... 3-143
3.6 Programmable Controller CPU Status Control .................................................................................... 3-144
3.6.1 Commands, control contents, and character area contents......................................................... 3-144
3.6.2 Remote RUN (command: 1001) .................................................................................................... 3-146
3.6.3 Remote STOP (command: 1002) .................................................................................................. 3-147
3.6.4 Remote PAUSE (command: 1003) ............................................................................................... 3-148
3.6.5 Remote RESET (command: 1006)................................................................................................ 3-149
3.6.6 Remote latch clear (command: 1005) ........................................................................................... 3-150
3.6.7 CPU model name read (command: 0101) ....................................................................................3-151
3.7 Drive Memory Defragmentation (for Other Station QnACPU) ............................................................ 3-153
3.7.1 Commands and contents of character area..................................................................................3-154
3.7.2 Reading the status of the drive memory usage (command: 0205) .............................................. 3-157
3.7.3 Drive memory defragmentation (command: 1207) ....................................................................... 3-158
3.8 File Control ............................................................................................................................................ 3-160
3.8.1 Commands and contents of character area..................................................................................3-161
3.8.2 Precautions on file control.............................................................................................................. 3-176