Mitsubishi Electric MELSEC Q Series User manual

Q Corresponding MELSECNET/H
Network System
Reference Manual (Remote I/O network)
-QJ71LP21
-QJ71LP21-25
-QJ71LP21S-25
-QJ71LP21G
-QJ71LP21GE
-QJ71BR11
-QJ72LP25-25
-QJ72LP25G
-QJ72LP25GE
-QJ72BR15

A - 1 A - 1
• SAFETY PRECAUTIONS •
(Read these precautions before using this product.)
Before using this product, please read this manual and the relevant manuals carefully and pay full
attention to safety to handle the product correctly.
The precautions given in this manual are concerned with this product only. For the safety precautions of
the programmable controller system, refer to the user’s manual for the CPU module used.
In this manual, the safety precautions are classified into two levels: " 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.
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 the network develops a communication error, the station with the communication error will
enter into the following status.
Check the communication status information and configure an interlock circuit in the sequence
program to ensure that the entire system will operate safely. Failure to do so may result in an
accident due to an incorrect output or malfunction.
(1) The remote master station will hold the data from before the communication error.
(2) The remote I/O station turns off all outputs. The output module of the remote I/O station can
clear/hold the output status at the time of error by using the remote I/O module parameters.
As the parameters are set to "clear" by default, the output module turns off the outputs at the
time of error. If it is required to hold the output in order to operate the system safely, set the
parameters to "hold".
!
WARNING
CAUTION

A - 2 A - 2
[Design Precautions]
WARNING
• When connecting a peripheral with the programmable controller CPU 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 or
operating status change) of a running programmable controller, read the relevant manuals
carefully and ensure that the operation is safe before proceeding. 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.
• If a communication cable is disconnected, the network may be unstable, resulting in a
communication failure of multiple stations. Configure an interlock circuit in the program to ensure
that the entire system will always operate safely even if communications fail. Failure to do so
may result in an accident due to an incorrect output or malfunction.
CAUTION
• Do not install the control lines or communication cables together with the main circuit lines or
power cables. Keep a distance of 100mm or more between them. Failure to do so may result in
malfunction due to noise.
• Reset the CPU module or remote I/O module after changing its parameters. Failure to do so
may cause malfunction because the previous parameter settings remain in the module.
[Installation Precautions]
CAUTION
• Use the programmable controller in an environment that meets the general specifications in the
user’s manual for the CPU module used. Failure to do so may result in electric shock, fire,
malfunction, or damage to or deterioration of the product.
• 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 mounting may cause malfunction, failure or drop of the
module. When using the programmable controller in an environment of frequent vibrations, fix
the module with a screw.
• Tighten the screws within the specified torque range. Undertightening can cause drop of the
screw, short circuit, or malfunction. Overtightening can damage the screw and/or module,
resulting in drop, short circuit, or malfunction
• Shut off the external power supply (all phases) used in the system before mounting/removing a
module or connecting/disconnecting a connector. Failure to do so may result in damage to the
product. Modules can be replaced online on a remote I/O station where a remote I/O module
with function version D or later is used. Note that there are restrictions on the modules that can
be replaced online, and each module has its predetermined replacement procedure. For details,
refer to the relevant section in this manual.
!
!
!

A - 3 A - 3
[Installation Precautions]
CAUTION
• Do not directly touch any conductive parts and electronic components of the module.
Doing so can cause malfunction or failure of the module.
[Wiring Precautions]
WARNING
• Shut off the external power supply (all phases) used in the system before installation and wiring.
Failure to do so may result in electric shock or damage to the product.
[Wiring Precautions]
CAUTION
• Individually ground the FG terminal of the programmable controller with a ground resistance of
100Ω or less.
Failure to do so may result in electric shock or malfunction.
• Check the rated voltage and terminal layout before wiring to the module, and connect the cables
correctly. Connecting a power supply with a different voltage rating or incorrect wiring may
cause a fire or failure.
• Connectors for external devices and coaxial cables must be crimped or pressed with the tool
specified by the manufacturer, or must be correctly soldered. Incomplete connections may
cause short circuit, fire, or 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.
• Tighten the terminal screws within the specified torque range. Undertightening can cause short
circuit, fire, or malfunction. Overtightening can damage the screw and/or module, resulting in
drop, short circuit, or malfunction.
• 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. For the cable connected to the
terminal block, loosen the terminal screw. Pulling the cable connected to the module may result
in malfunction or damage to the module or cable.
• Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter
can cause a fire, failure, or malfunction.
• 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 the film during wiring.
Remove it for heat dissipation before system operation.
• Mitsubishi Electric programmable controllers must be installed in control panels. Connect the
main power supply to the power supply module in the control panel through a relay terminal
block. Wiring and replacement of a power supply module must be performed by qualified
maintenance personnel with knowledge of protection against electric shock. For wiring methods,
refer to the QCPU User's Manual (Hardware Design, Maintenance and Inspection).
!
!
!

A - 4 A - 4
[Setup and Maintenance Precautions]
WARNING
• Do not touch any terminal while power is on. Doing so will cause electric shock or malfunction.
• Shut off the external power supply (all phases) used in the system before cleaning the module or
retightening the terminal screws or module fixing screws.
Failure to do so may result in electric shock or cause the module to fail or malfunction.
[Setup and Maintenance Precautions]
CAUTION
• Before performing online operations (especially, program modification, forced output, and
operating status change) for the running CPU module on another station from GX Developer
over the MELSECNET/H network, read relevant manuals carefully and ensure the safety.
Improper operation may damage machines or cause accidents.
• Do not disassemble or modify the modules.
Doing so may cause failure, malfunction, injury, or a fire.
• Use any radio communication device such as a cellular phone or PHS (Personal Handy-phone
System) more than 25cm away in all directions from the programmable controller.
Failure to do so may cause malfunction.
• Shut off the external power supply (all phases) used in the system before mounting/removing a
module or connecting/disconnecting a connector. Failure to do so may cause the module to fail
or malfunction. Modules can be replaced online in a remote I/O network system where a remote
I/O module with function version D or later is used. Note that there are restrictions on the
modules that can be replaced online, and each module has its predetermined replacement
procedure. For details, refer to the relevant section in this manual.
• 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 compliant).
Exceeding the limit of 50 times 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 the module to fail or malfunction.
[Disposal Precautions]
CAUTION
• When disposing of this product, treat it as industrial waste.
!
!
!

A - 5 A - 5
• 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.

A - 6 A - 6
REVISIONS
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Oct., 2000 SH (NA) -080124-A First printing
May., 2001 SH (NA) -080124-B Model addition
QJ71LP21G, QJ72LP25G, QJ71LP21GE, QJ72LP25GE
Correction
Product Components, About The Generic Terms And Abbreviations,
Chapter 1, Section 1.2, 2.4, 3.1.1, 3.1.2, 3.2.1, 3.2.2, 3.3.2, 4.2.1, 4.2.2,
4.8.2, Chapter 5, Section 5.1.5, 5.2.1, 6.1.2, 6.2.1, 6.3, 6.4, 7.1.1, 7.8,
8.1, 8.1.1, 8.1.4, 8.3.1, 8.3.2, Appendix 2, 3, 4, 5, Index
Addition
Section 8.2.6
Apr., 2002 SH (NA) -080124-C Correction
Section 1.2, 1.3, 2.3.1, 2.3.2, 2.3.3, 2.5, 3.1.1, 3.1.2, 3.2, 3.3.2, 4.2.1,
6.1.1, 6.4, Chapter 7, Section 8.4, Appendix 2, 3
Changed item numbers
Section 2.3 Section 2.4, Section 2.4 Section 2.5
Addition
Section 7.10
Nov., 2002 SH (NA) -080124-D Model addition
QJ71LP21S-25
Correction
SAFETY PRECAUTIONS, CONTENTS,
Generic Terms And Abbreviations, Product Components,
Section 1.1, 1.2, 3.1.1, 3.1.2, 4.1.2, 4.8.1, 4.8.2, 7.1.1, 8.1.4,
Appendix 2, 3
Apr., 2003 SH (NA) -080124-E Correction
SAFETY PRECAUTIONS, About Manuals, Section 1.2, 2.1.2, 2.2.2,
2.3.2, 2.5, 3.1.1, 3.1.2, 3.2.2, 3.3.1, Chapter 5, Section 5.1.3, 5.1.5, 6.2,
6.3, 6.4, 6.5, 8.1, 8.2, 8.2.1, 8.2.5, 8.3.1

A - 7 A - 7
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Jun., 2004 SH (NA) -080124-F Correction
SAFETY PRECAUTIONS, Manuals, Generic Terms And Abbreviations,
Section 1.2, 2.1.2, 2.2.2, 2.3.2, 2.4.2, 2.5, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2,
3.2.2, 4.2.2, 4.9.1, 4.10, 4.10.1, 4.10.2, 4.10.3, Chapter 5, Section 5.1.1,
5.2, 5.2.1, 6.4, 6.5, Chapter 7, Section 8.1, 8.1.1, 8.1.2, 8.1.3, 8.1.4,
8.2.1, 8.2.3, 8.2.5, 8.2.7, 8.3.1, 8.3.2, Appendix 2, 3
Addition
Section 1.4, 2.4, 2.7, 3.3.3, 3.3.4, 7.11, 7.12, 8.2.7, Appendix 7
Changed section No.
Section 2.4 Section 2.5, Section 2.5 Section 2.6
Mar., 2005 SH (NA) -080124-G Correction
Safety Precautions, Conformation to the EMC Directive and Low Voltage
Instruction, Product Configuration, Section 1.1, 1.2, 2.6, 2.7, 3.1.1, 3.1.2,
3.1.4, 3.2.2, 3.3.2, 4.2.1, 4.2.2, 4.3, 4.4, 4.8.1, 4.8.2, 4.9.1, 4.10.1, 5.1.4,
6.1.1, 6.2, 6.2.2, 6.3, 7.4, 8.1, 8.1.2, 8.1.3, 8.2, 8.2.1, 8.3.1, 8.3.2,
Appendix 2, 3, 4, 5, 7
Addition
Section 8.2.8
Sep., 2005 SH (NA) -080124-H Correction
Generic Terms And Abbreviations, Section 1.2, Section 2.5, Section 3.2,
3.2.2, 3.3.2, Section 5.1.5, 5.2.1, Section 6.3, 6.5, Section 7.12, Section
8.2, 8.2.5, 8.3.1, 8.3.2, Appendix 3, 4, 5
May, 2006 SH (NA) -080124-I Correction
Generic Terms And Abbreviations, Section 1.1, Chapter 2, Section 2.2.1,
2.5, 3.1.1, 3.1.4, 4.2.1, 4.2.2, 5.1.3, 5.1.4, 5.1.5, 6.3, 6.4, 7.1.1, 8.1.2,
8.3.2, Appendix 5
Addition
Section 2.5.1, 2.5.2
Sep., 2006 SH (NA) -080124-J Correction
Section 2.1.2, 2.2.2, 2.3.2, 2.4.2, 4.2.1, 4.2.2, 8.3.2

A - 8 A - 8
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Nov., 2006 SH (NA) -080124-K Addition
SAFETY PRECAUTIONS
Correction
Section 2.5.2, 3.2.2, 4.2.1, 4.2.2, 4.3, 4.8.1, 4.8.2, 5.1.5, 8.1.2, 8.2, 8.2.4,
8.3.2, Appendix 2, 3, 5
Sections added
Section 8.2.8, 8.4, 8.5
Changed section No.
Section 8.2.8 Section 8.2.9, Section 8.4 Section 8.6
Oct., 2007 SH (NA) -080124-L Addition
Chapter 1, Section 2.1.2, 2.2.2, 2.3.2, 2.4.2, 2.5.1, 2.5.2, 2.7, 3.3.1, 3.3.2,
4.8.2, Chapter 5, Section 5.1.4, 5.1.5, 8.2.1, 8.3.1, Appendix 2, 4, 5
Correction
SAFETY PRECAUTIONS , Generic Terms And Abbreviations, Section
2.2.1, 2.3.1, 2.4.1, 4.2.1, 4.7.1, 4.7.2, 4.7.3, 4.9.1, 5.1.1, 5.1.3, 6.1.1, 6.2,
6.3, 6.5, 6.6, 7.1.1, 7.12, 8.1, Appendix 3
Sections added
DEFINITIONS OF TERMINOLOGY, Section 6.4
Changed section No.
Section 6.4 to 6.5 Section 6.5 to 6.6, Appendix 7 Appendix 6
Feb., 2008 SH (NA)-080124-M Correction
Generic Terms And Abbreviations, Section 1.2, 2.1.2, 2.2.2, 2.3.2, 2.4.2,
2.5, 3.2.2, 3.3.2, 4.7, 4.8, 4.9.1, 5.1.1, 5.1.4 to 5.1.6, 5.2.1, 6.1.1, 6.5, 6.6,
7.1.1, 7.8, 7.11.4, 8.1, 8.3, 8.4, Appendix 2, 3, 5
Sep., 2008 SH (NA)-080124-N Correction
SAFETY PRECAUTIONS, Compliance with the EMC and Low Voltage
Directives, Generic Terms And Abbreviations, DEFINITIONS OF
TERMINOLOGY, Chapter1, Section 1.2, 1.3, 2.1.2, 2.1.3, 2.2, 2.2.1,
2.2.3, 2.3, 2.4.2, 2.4.3, 2.5.1, 2.6, 3.1.4, 3.2, 3.3.2, 3.3.4, 4.2.1, 4.2.2, 4.8,
4.9.1, Chapter 5, Section 5.1.3 to 5.1.5, 6.1.2, 6.5, 6.6, Chapter 7, 7.1.1,
7.10, 7.11, 7.11.1, 7.11.3, 7.11.4, Chapter 8, 8.1, 8.2, 8.2.5, 8.2.7, 8.3.1,
8.3.2, Appendix 2 to 6

A - 9 A - 9
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Aug., 2009 SH (NA) -080124-O Correction
Generic Terms And Abbreviations, Section 1.3, 2.5.1, 2.7, 3.3.2, 6.4.2,
Chapter 8
Sections added
Section 8.3.1
Changed section No.
Section 8.3.1(4) Section 8.3.2, Section 8.3.2 Section 8.3.3
Sep., 2010 SH (NA) -080124-P Correction
Generic Terms And Abbreviations, Section 1.3, 2.5.1, 2.5.2, 2.7, 3.3.2,
4.2.1, 4.2.2, 4.3, Chapter 5, Section 5.1.5, 5.1.6, 6.1.1, 8.2.9, 8.3.1, 8.3.2,
8.3.3, Appendix 2, 6
Sections added
CONDITIONS OF USE FOR THE PRODUCT
Mar., 2011 SH (NA) -080124-Q Correction
Section 3.1.4, 3.3.1, 8.3.2, Appendix 5
Sep.,2012 SH (NA) -080124-R Correction
SAFETY PRECAUTIONS, COMPLIANCE WITH THE EMC AND LOW
VOLTAGE DIRECTIVES, GENERIC TERMS AND ABBREVIATIONS,
PACKING LIST, Section 1.2, 1.4, 2.1.2, 2.2.2, 2.3.1, 2.3.2, 2.4.1, 2.4.2,
2.5.1, 2.5.2, 2.6, 2.7, 3.1.1, 3.1.2, 3.1.4, 3.2, 3.2.1, 3.2.2, 3.3.1, 3.3.2,
3.3.3, 3.3.4, 4.1, 4.2.1, 4.2.2, 4.3, 4.7, 4.8.1, 4.8.2, 4.9.1, 4.10, 4.10.1,
4.10.2, 4.10.3, Chapter 5, Section 5.1.1, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6,
5.2.1, 6.1.1, 6.1.2, 6.5, 6.6, Chapter 7, Section 7.11, 7.11.3, 7.11.4, 7.12,
Chapter 8, Section 8.1, 8.1.1, 8.1.3, 8.2, 8.2.1, 8.2.4, 8.2.5, 8.3, 8.3.1,
8.3.2, 8.3.3, 8.4, 8.6, Appendix 1, 2, 3, 5, 6, INDEX
Jul., 2013 SH (NA) -080124-S Correction
SAFETY PRECAUTIONS, MANUALS, GENERIC TERMS AND
ABBREVIATIONS, Chapter 1, Section 1.2, 1.3, 2.5.1, 2.5.2, 4.2.1, 4.2.2,
4.7, 4.7.1, 4.7.2, 4.7.3, 4.8.1, 4.10.1, 4.10.2, 4.10.3, 4.10.4, Chapter 5,
Section 5.2.1, 6.1.1, 6.4.1, 6.6, 7.11, 7.12, 8.1.1, 8.1.2, 8.1.3, 8.1.4, 8.2.6,
8.3.1, 8.3.3, Appendix 1, 2, 3, 4, 5

A - 10 A - 10
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Feb., 2018 SH (NA) -080124-T Correction
GENERIC TERMS AND ABBREVIATIONS, Section 2.7, 3.1.4, 3.3.2,
4.2.1, 4.2.2, Appendix 6
Sep., 2019 SH (NA) -080124-U Addition
Section 8.2.4
Changed section No.
Section 8.2.4 to Section 8.2.9 Section 8.2.5 to Section 8.2.10
Japanese Manual Version SH-080123-Y
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 - 11 A - 11
INTRODUCTION
Thank you for purchasing the Mitsubishi Electric MELSEC-Q series programmable controllers.
Before using this product, please read this manual carefully and develop familiarity with the functions and
performance of the MELSEC-Q series programmable controller to handle the product correctly.
CONTENTS
SAFETY PRECAUTIONS ............................................................................................................................ A- 1
CONDITIONS OF USE FOR THE PRODUCT ........................................................................................... A- 5
REVISIONS ................................................................................................................................................. A- 6
CONTENTS ................................................................................................................................................... A-11
MANUALS ................................................................................................................................................... A-16
COMPLIANCE WITH THE EMC AND LOW VOLTAGE DIRECTIVES ....................................................... A-16
GENERIC TERMS AND ABBREVIATIONS ................................................................................................. A-17
DEFINITIONS OF TERMINOLOGY .............................................................................................................. A-19
PACKING LIST ............................................................................................................................................... A-20
1 OVERVIEW 1- 1 to 1-11
1.1 Overview .............................................................................................................................................. 1- 2
1.2 Features ............................................................................................................................................... 1- 3
1.3 Abbreviations Used in the Text, Tables and Diagrams of This Manual .............................................. 1-10
1.4 Functions Added/Changed with Upgrade to Function Version D ........................................................ 1-11
2 SYSTEM CONFIGURATION 2- 1 to 2-23
2.1 Single Remote I/O Networks ............................................................................................................... 2- 1
2.1.1 Configuration ................................................................................................................................ 2- 1
2.1.2 Setting items ................................................................................................................................. 2- 2
2.1.3 Available device ranges ............................................................................................................... 2- 3
2.2 Multiple Remote I/O Network (Process CPU) .................................................................................... 2- 4
2.2.1 Configuration ................................................................................................................................ 2- 4
2.2.2 Setting items ................................................................................................................................. 2- 5
2.2.3 Available device ranges ............................................................................................................... 2- 6
2.3 Multiplexed Remote I/O Network for Redundant System (Redundant CPU) .................................... 2- 7
2.3.1 Configuration ................................................................................................................................ 2- 7
2.3.2 Setting items ................................................................................................................................. 2- 8
2.3.3 Available device ranges ............................................................................................................... 2- 9
2.4 Multiple Remote I/O Network ................................................................................................................ 2-10
2.4.1 Configuration .................................................................................................................................. 2-10
2.4.2 Setting items ................................................................................................................................... 2-11
2.4.3 Available device ranges ................................................................................................................. 2-12
2.5 Applicable Systems ............................................................................................................................... 2-13
2.5.1 Applicable systems for remote master stations ............................................................................... 2-13
2.5.2 Applicable systems for remote I/O stations ...................................................................................... 2-15
2.6 When Using a Multiple CPU System .................................................................................................... 2-19
2.7 Checking Function Version and Serial No. ........................................................................................... 2-22

A - 12 A - 12
3 SPECIFICATIONS 3- 1 to 3-64
3.1 Performance Specifications ................................................................................................................ 3- 1
3.1.1 Optical loop system performance specifications ......................................................................... 3- 1
3.1.2 Coaxial cable system performance specifications ...................................................................... 3- 3
3.1.3 Optical fiber cable specifications .................................................................................................. 3- 4
3.1.4 Coaxial cable specifications ......................................................................................................... 3- 5
3.2 Function Specifications ......................................................................................................................... 3-10
3.2.1 Cyclic transmission function (periodic communication) ................................................................ 3-11
(1) Communicating with I/O modules .............................................................................................. 3-11
(2) Communicating with intelligent function modules ...................................................................... 3-12
3.2.2 RAS functions ................................................................................................................................. 3-17
(1) Output reset function for communication errors ......................................................................... 3-17
(2) Hardware error time CPU operation mode setting .................................................................... 3-17
(3) Automatic return function ............................................................................................................ 3-18
(4) Loopback function (optical loop system) .................................................................................... 3-19
(5) Station detach function (coaxial bus system) ............................................................................ 3-21
(6) Transient transmission enabled even at CPU module error ..................................................... 3-22
(7) Abnormal detection time ............................................................................................................. 3-23
(8) Diagnostic function ...................................................................................................................... 3-24
(9) Redundant power supply on a remote I/O station ..................................................................... 3-25
(10) Online module change on a remote I/O station ....................................................................... 3-28
3.3 Link Data Send/Receive Processing Time Specifications ................................................................... 3-34
3.3.1 Link data send/receive processing ................................................................................................ 3-34
3.3.2 Transmission delay time ................................................................................................................ 3-40
3.3.3 Switching time from the multiplexed remote master station to the multiplexed remote
sub-master station in a multiplexed remote I/O network ................................................................ 3-59
3.3.4 Output holding time during system switching in the multiplexed remote I/O network for
redundant system ............................................................................................................................
3-60
4 SETTING AND PROCEDURE BEFORE OPERATION 4- 1 to 4-37
4.1 Procedure Before Operation ............................................................................................................... 4- 1
4.2 Part Names and Settings .................................................................................................................... 4- 2
4.2.1 QJ71LP21, QJ71LP21-25, QJ71LP21G, QJ71LP21GE, QJ71BR11 (Remote master station)
....................................................................................................................................................... 4- 2
4.2.2 QJ72LP25-25, QJ72LP25G, QJ72LP25GE, QJ72BR15 ............................................................ 4- 6
4.3 Installing and Uninstalling the Module .................................................................................................. 4-11
4.4 Stopping the CPU (Unintentional Output Prevention) .......................................................................... 4-13
4.5 Checking the Input Power Supply Voltage ........................................................................................... 4-13
4.6 Powering On .......................................................................................................................................... 4-13
4.6.1 Checking the on status of the POWER LED of the power supply module ................................... 4-13
4.6.2 Checking the on status of the RUN LED of the network module .................................................. 4-13
4.7 Unit Tests of the Network Module (Offline Test) .................................................................................. 4-14
4.7.1 Self-loopback test ........................................................................................................................... 4-15
4.7.2 Internal self-loopback test .............................................................................................................. 4-17
4.7.3 Hardware test ................................................................................................................................. 4-19
4.8 Cable Connections ................................................................................................................................ 4-21
4.8.1 Optical loop system ........................................................................................................................ 4-21

A - 13 A - 13
4.8.2 Coaxial bus system ........................................................................................................................ 4-23
4.9 Offline Tests from GX Developer .......................................................................................................... 4-28
4.9.1 Forward loop/reverse loop test (Remote master station only) ...................................................... 4-28
4.10 Network Diagnostics from GX Developer (Online Tests) .................................................................. 4-32
4.10.1 Loop test (optical loop system only) ............................................................................................ 4-33
4.10.2 Setup confirmation test................................................................................................................. 4-34
4.10.3 Station order check test (optical loop system only) ..................................................................... 4-35
4.10.4 Communication test ...................................................................................................................... 4-36
5 PARAMETER SETTINGS 5- 1 to 5-38
5.1 Remote Master Station Parameter Setting ......................................................................................... 5- 5
5.1.1 Setting the number of modules (Network type) ........................................................................... 5- 5
5.1.2 Network settings ........................................................................................................................... 5- 6
(1) Starting I/O No. ......................................................................................................................... 5- 6
(2) Network No. .............................................................................................................................. 5- 6
(3) Total stations ............................................................................................................................. 5- 6
(4) Group No. (Available for multiplexed remote master/sub-master station only) ........................ 5- 7
(5) Mode .......................................................................................................................................... 5- 7
(6) Parameter setting example ....................................................................................................... 5- 8
5.1.3 Common parameter ..................................................................................................................... 5- 9
(1) LX/LY setting ............................................................................................................................. 5- 9
(2) LB/LW setting .............................................................................................................................. 5-12
(3) Reserved station specification .................................................................................................... 5-13
(4) Remote sub-master station ........................................................................................................ 5-13
5.1.4 Supplementary settings .................................................................................................................. 5-15
5.1.5 Refresh parameters ........................................................................................................................ 5-19
5.1.6 Valid module during other station access ...................................................................................... 5-31
5.1.7 Redundant settings......................................................................................................................... 5-32
5.2 Remote I/O Station Parameter Settings ............................................................................................... 5-33
5.2.1 Remote I/O station possible parameter settings ........................................................................... 5-33
6 PROGRAMMING 6- 1 to 6-41
6.1 Programming Precautions .................................................................................................................. 6- 1
6.1.1 Interlock related signals ................................................................................................................ 6- 1
6.1.2 Program example ......................................................................................................................... 6- 4
6.2 Cyclic Transmission ............................................................................................................................ 6- 7
6.2.1 32-bit data assurance ................................................................................................................... 6- 7
6.2.2 Block data assurance per station of cyclic data .......................................................................... 6- 8
6.3 Communications with I/O Modules ..................................................................................................... 6- 9
6.4 Communications with Intelligent Function Modules ............................................................................. 6-10
6.4.1 Program example when using GX Configurator............................................................................ 6-11
6.4.2 Program example when not using GX Configurator ..................................................................... 6-15
6.5 Link Dedicated Instruction List .............................................................................................................. 6-18
6.6 Using the Link Special Relays (SB)/ Link Special Registers (SW) ...................................................... 6-23

A - 14 A - 14
7 APPLICATION FUNCTIONS 7- 1 to 7-44
7.1 Transient Transmission Function (Non-Periodical Communication) ................................................. 7- 2
7.1.1 Link dedicated instruction ............................................................................................................. 7- 3
(1) Reading/writing remote I/O station intelligent function module buffer memory
(Z(P).REMFR/ Z(P).REMTO) ................................................................................................ 7- 3
7.2 Remote I/O Station System Monitor ................................................................................................... 7- 9
7.3 Device Test for Remote I/O Station ...................................................................................................... 7-10
7.4 Multiplex Transmission Function (Optical Loop System) ..................................................................... 7-12
7.5 Return Sequence Station Number Setting Function ............................................................................ 7-13
7.6 Reserved Station Function .................................................................................................................... 7-13
7.7 Interrupt Settings ................................................................................................................................... 7-14
7.8 I/O Assignment Function ....................................................................................................................... 7-15
7.9 Stopping/Restarting the Cyclic Transmission and Stopping Link Refreshing (Network Test) ............ 7-16
7.10 Multiplexed Remote Master Function (Process CPU) ....................................................................... 7-17
7.11 Multiplexed Remote Master Function for the Redundant System (Redundant CPU) ...................... 7-32
7.11.1 Backup function of master operation on system switching between control system and
standby system ................................................................................................................................ 7-34
7.11.2 Master operation by the station that has started up as the control system ................................ 7-35
7.11.3 System switching request function of control system ................................................................. 7-36
7.11.4 Access function by specifying the control system or standby system ........................................ 7-39
7.12 Remote password ............................................................................................................................... 7-40
8 TROUBLESHOOTING 8- 1 to 8-61
8.1 Network Diagnostics (Network Monitor) ............................................................................................. 8- 2
8.1.1 Host information ........................................................................................................................... 8- 5
8.1.2 Other station information .............................................................................................................. 8- 7
8.1.3 Network monitor details ................................................................................................................ 8- 9
8.1.4 Error history monitor ....................................................................................................................... 8-12
8.2 Troubleshooting ..................................................................................................................................... 8-15
8.2.1 Items checked first .......................................................................................................................... 8-21
8.2.2 Items checked when data link cannot be performed throughout the system ................................ 8-21
8.2.3 Items checked when data link is disabled by resetting or powering off a station .......................... 8-22
8.2.4 Items checked when cyclic data is 0 by resetting or powering on a station .................................. 8-22
8.2.5 Items checked when data link cannot be performed on a certain station ..................................... 8-23
8.2.6 Items checked when an communication data error is detected .................................................... 8-24
8.2.7 Items checked when a link dedicated instruction does not complete ............................................ 8-24
8.2.8 Items checked when multiplexed remote I/O network for redundant system does not operate
normally ........................................................................................................................................... 8-25
8.2.9 Items checked when a minor error (continue error) on a remote I/O station cannot be detected
......................................................................................................................................................... 8-25
8.2.10 Checking incorrect optical fiber cable connection during online .................................................... 8-26
8.3 Error Codes ........................................................................................................................................... 8-29
8.3.1 How to check error codes .............................................................................................................. 8-29
8.3.2 MELSECNET/H error code list ....................................................................................................... 8-35
8.3.3 Error codes detected on remote I/O stations and equivalent to CPU module error codes .......... 8-44
8.4 Canceling a Minor Error (Continue Error) on a Remote I/O Station .................................................... 8-53
8.4.1 Canceling a specific remote I/O station error ................................................................................ 8-54

A - 15 A - 15
8.4.2 Canceling errors of all remote I/O stations .................................................................................... 8-55
8.5 Procedure for Replacing a Normally Operating Redundant Power Supply Module ........................... 8-60
8.6 H/W Information ..................................................................................................................................... 8-61
APPENDICES App- 1 to App-53
Appendix 1 Precautions for Replacing MELSECNET/10 Remote I/O Network with MELSECNET/H
Remote I/O Network. ........................................................................................................... App- 1
Appendix 2 Link Special Relay (SB) ..................................................................................................... App- 3
Appendix 3 Link Special Register (SW) ................................................................................................. App-14
Appendix 4 Special Relay (SM) for Remote I/O Stations ...................................................................... App-33
Appendix 5 Special Register (SD) for Remote I/O Module ................................................................... App-36
Appendix 6 External Dimensions ........................................................................................................... App-50
INDEX Index- 1 to Index- 2

A - 16 A - 16
MANUALS
The manuals related to this product are listed below.
Order each manual as needed, referring to the following lists.
Relevant manuals
Manual name Manual number
(model code)
Q Corresponding MELSECNET/H Network System Reference Manual (PLC to PLC network)
Specifications, procedures and settings before system operation, parameter setting, programming, and
troubleshooting of a MELSECNET/H network system (PLC to PLC network) (Sold separately)
SH-080049
(13JF92)
Q Corresponding MELSECNET/H Remote I/O Module Reference Manual (MELSECNET/10
Mode)
Operating procedures, system configuration, parameter settings, functions, programming, and
troubleshooting of the MELSECNET/H remote I/O module when used in MELSECNET/10 mode.
(Sold separately)
SH-081164ENG
(13JV30)
COMPLIANCE WITH THE EMC AND LOW VOLTAGE DIRECTIVES
(1) For programmable controller system
To ensure that Mitsubishi Electric programmable controllers maintain EMC and
Low Voltage Directives when incorporated into other machinery or equipment,
certain measures may be necessary. Please refer to one of the following
manuals.
• QCPU User's Manual (Hardware Design, Maintenance and Inspection)
• Safety Guidelines
(This manual is included with the CPU module or base unit.)
The CE mark on the side of the programmable controller indicates compliance
with EMC and Low Voltage Directives.
(2) For the product
To ensure that this product maintains EMC and Low Voltage Directives, please
refer to one of the manuals listed under (1).

A - 17 A - 17
GENERIC TERMS AND ABBREVIATIONS
Generic term/abbreviation Description
QJ71LP21
An abbreviation for the QJ71LP21, QJ71LP21-25, QJ71LP21S-25, QJ71LP21G, and
QJ71LP21GE MELSECNET/H network module.
However, especially in cases to show different models, the QJ71LP21, QJ71LP21-25,
QJ71LP21S-25, QJ71LP21G and QJ71LP21GE are printed.
QJ71BR11 An abbreviation for the QJ71BR11 MELSECNET/H network module
QJ72LP25
An abbreviation for the QJ72LP25-25, QJ72LP25G, and QJ72LP25GE MELSECNET/H
network modules.
However, especially in cases to show different models, the QJ72LP25-25, QJ72LP25G
and QJ72LP25GE are printed.
QJ72BR15 An abbreviation for the QJ72BR15 MELSECNET/H network module
Master module A generic term for the QJ71LP21 and QJ71BR11
Remote I/O module A generic term for the QJ72LP25 and QJ72BR15
Network module A generic term for master module and remote I/O module
Ethernet module An abbreviation for the QJ71E71, QJ71E71-100, QJ71E71-B5, and QJ71E71-B2
Ethernet interface modules
Serial communication module An abbreviation for the QJ71C24N, QJ71C24N-R2, QJ71C24N-R4, QJ71C24, and
QJ71C24-R2 serial communication modules
CC-Link IE Controller Network
module
An abbreviation for the QJ71GP21-SX and QJ71GP21S-SX CC-Link IE Controller
Network modules
CC-Link IE Field Network An abbreviation for the QJ71GF11-T2 CC-Link IE Field Network module
MELSECNET/H An abbreviation for the Q series MELSECNET/H network system
MELSECNET/10 An abbreviation for the AnU series MELSECNET/10 network system and QnA/Q4AR
series MELSECNET/10 network system
QCPU A generic term for the Basic model QCPU, High Performance model QCPU, Process
CPU, Redundant CPU, and Universal model QCPU
Basic model QCPU A generic term for the Q00JCPU, Q00CPU, and Q01CPU
High Performance model
QCPU
A generic term for the Q02CPU, Q02HCPU, Q06HCPU, Q12HCPU, and Q25HCPU
Process CPU A generic term for the Q02PHCPU, Q06PHCPU, Q12PHCPU, and Q25PHCPU
(Indicated as QnPHCPU in figures.)
Redundant CPU A generic term for the Q12PRHCPU and Q25PRHCPU (Indicated as QnPRHCPU in
figures.)
Universal model QCPU
A generic term for the Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCPU, Q03UDCPU,
Q03UDVCPU, Q03UDECPU, Q04UDHCPU, Q04UDVCPU, Q04UDEHCPU,
Q06UDHCPU, Q06UDVCPU, Q06UDEHCPU, Q10UDHCPU, Q10UDEHCPU,
Q13UDHCPU, Q13UDVCPU, Q13UDEHCPU, Q20UDHCPU, Q20UDEHCPU,
Q26UDHCPU, Q26UDVCPU, Q26UDEHCPU, Q50UDEHCPU, and Q100UDEHCPU
Built-in Ethernet port QCPU
A generic term for the Q03UDVCPU, Q03UDECPU, Q04UDVCPU, Q04UDEHCPU,
Q06UDVCPU, Q06UDEHCPU, Q10UDEHCPU, Q13UDVCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDVCPU, Q26UDEHCPU, Q50UDEHCPU, and Q100UDEHCPU
Safety CPU A generic term for the QS001CPU

A - 18 A - 18
Generic term/abbreviation Description
C Controller module A generic term for the C Controller modules: Q06CCPU-V-H01, Q06CCPU-V,
Q06CCPU-V-B, Q12DCCPU-V, and Q24DHCCPU-V
QnACPU A generic term for MELSEC-QnA series CPU modules
ACPU A generic term for MELSEC-A series CPU modules
AnUCPU A generic term for the MELSEC-A series CPU modules: A2UCPU, A2UCPU-S1,
A3UCPU, A4UCPU, A2USCPU, A2USCPU-S1, and A2USHCPU-S1
Q3 B A generic term for the Q33B, Q35B, Q38B and Q312B main base units
Q3 SB A generic term for the Q32SB, Q33SB and Q35SB slim type main base units
Q3 RB Another term for the Q38RB main base units for the redundant power supply system
Q5 B A generic term for the Q52B and Q55B extension base units
Q6 B A generic term for the Q63B, Q65B, Q68B and Q612B extension base units
Q6 RB Another term for the Q68RB extension base units for the redundant power supply
system
Q6 WRB Another term for the Q65WRB redundant type extension base units
QA1S6 B A generic term for the QA1S65B and QA1S68B extension base units
Q6 P A generic term for the Q61P, Q61P-A1, Q61P-A2, Q62P, Q63P, Q64P, and Q64PN
power supply modules
Q6 RP A generic term for the Q61P, Q63RP and Q64RP power supply modules for the
redundant power supply system
Redundant power supply
module
GX Developer
A generic product name for SWnD5C-GPPW-J, SWnD5C-GPPW-JA, SWnD5C-GPPW-
JV, and SWnD5C-GPPW-JVA ("n" means version 4 or later.)
"-A" and "-V" mean "volume license product" and "version-upgrade product"
respectively.
GX Works2 A generic product name for SWnDND-GXW2 and SWnDNC-GXW2 (n: version)
GX Configurator An abbreviation for the GX Configurator software package
REMFR An abbreviation for the Z.REMFR and ZP.REMFR
REMTO An abbreviation for the Z.REMTO and ZP.REMTO
Tracking cable An abbreviation for the QC10TR and QC30TR tracking cables