Mitsubishi MELSEC Q Series User manual

A - 1 A - 1
•SAFETY PRECAUTIONS •
(Be sure to read before use)
Before using this product, read through this manual and the relevant ones introduced in this manual to
handle the product correctly and safely.
The following instructions are limited to the CC-Link/LT master module only. For safety precautions on
the programmable controller system, refer to the user’s manual of the CPU module to be used.
In this manual, the levels of hazardous situations are shown as follows:
!DANGER
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 medium or slight personal injury or physical damage.
Note that even a !CAUTION leveled situation may lead to a serious consequence. Be sure to follow
the instructions of both levels.
Keep this manual in a handy place and make sure to deliver this to the end user.
[Design Precautions]
!DANGER
•When the data link communication is faulty, refer to Chapter 6 of this manual for operating states
of each station.
•When connecting peripheral devices to the CPU module, create interlock circuits in the
sequence programs so that the safety of the whole system will be ensured.
Before modifying programs, changing operating status (status control) or conducting other
controls with the programmable controller running, thoroughly read the relevant manuals and
confirm the safety. Especially when instructing these controls from external devices to a remote
programmable controller, problems arisen on the programmable controller may not be solved
immediately due to abnormal data communications.
To prevent this, create interlock circuits in the sequence programs and set the corrective
measures between the external devices and the programmable controller CPU in case of
abnormal data communication.
•Do not write data to “Prohibited area” of the buffer memory.
Doing so may lead to malfunction of the programmable controller system.
!CAUTION
•Do not bring the control wires and communication cables close to the main circuit or power
wires.
Keep a distance of at least 100mm between them.
Failure to do so may cause malfunctions due to noise.

A - 2 A - 2
[Installation Precautions]
!CAUTION
•Use the programmable controller system in the operating environment that meets the general
specifications of this manual.
Using in any other environment may cause electric shocks, fires, malfunctions, or damage or
deterioration of the product.
•While pressing the installation lever located at the bottom of module, insert the module fixing tab
into the fixing hole in the base unit until it stops. Then, securely mount the module with the fixing
hole as a supporting point.
Incorrect installation may cause malfunctions, fault or drop of the module.
When using the module in an environment where constant vibrations may occur, secure it with
screws. Tighten the screws within the specified torque range.
Loose tightening may cause a drop of the module, a short circuit or malfunctions.
Excessive tightening may cause the same as the above due to damage to the screws or the
module.
•Be sure to shut off all phases of the external power supply used by the system before mounting
or dismounting the module.
Failure to do so may damage the product.
•Do not directly touch the conducting parts and electronic parts of the module.
Doing so may cause a malfunction or a fault of the module.
[Wiring Precautions]
!CAUTION
•Carefully prevent foreign matter such as chaff and wire chips from entering the inside of the
module.
They may cause a fire, fault or malfunction.
•The module has an ingress prevention label on its top to prevent foreign matter, such as wire
offcuts, from entering the module during wiring.
Do not peel this label during wiring.
Before starting system operation, be sure to peel this label because of heat dissipation.
•For the CC-Link/LT, use the cables specified by the CC-Link Partner Association.
The performance of the CC-Link/LT cannot be assured if any other cables than the specified are
used.
Also, observe the network wiring specifications given in Chapter 3.
Normal data communication is not guaranteed if the wiring is not conducted according to the
specifications.
•Place the communication cables or power cables for the module in a duct or to fasten them with
clamps.
If not, the dangling condition, shift or inadvertent pulling of the cables may lead to damage to the
module or cables, or a malfunction due to faulty cable connection.

A - 3 A - 3
[Wiring Precautions]
!CAUTION
•When disconnecting a communication cable or power cable from the module, do not hold and
pull the cable portion by hand.
For the cable with a connector, hold the connector connected to the module with a hand and pull
it out.
For the cable connected to a terminal block, loosen the screws on the terminal block and
disconnect the cable.
Pulling the cable with it connected to the module may result in malfunctions or damage to the
module and/or cables.
[Precautions on Activation/Maintenance]
!CAUTION
•Do not disassemble or modify the module.
Doing so may cause a fault, malfunction, injury or fire.
•Be sure to shut off all phases of the external power supply used by the system before mounting
or dismounting the module.
Failure to do so may cause a fault or malfunction of the module.
•Do not touch any terminal while the power is on. Doing so may cause malfunctions.
•Be sure to shut off all phases of the external power supply used by the system before cleaning
the module or retightening the terminal screws or module installation screws.
Failure to do so may cause a fault or malfunction of the module.
Loose tightening may cause a drop of the module, a short circuit or malfunctions.
Excessive tightening may cause the same as the above due to damage to the screws or the
module.
•Do not mount/remove the module to/from the base unit or terminal block more than 50 times
(IEC 61131-2 compliant), after the first use of the product.
Failure to do so may cause module malfunctions.
•Before handling the module, always touch grounded metal, etc. to discharge static electricity
from the human body.
Failure to do so can cause the module to fail or malfunction.
[Precautions on Disposal]
!CAUTION
•When disposing of this product, treat it as industrial waste.

A - 4 A - 4
REVISIONS
* The manual number is given on the bottom left of the back cover.
Print Date * Manual Number Revision
Sep., 2002 SH(NA)-080351E-A First printing
Feb., 2003 SH(NA)-080351E-B Correction
Section 2.1, 2.2.2, 3.1.1, 4.5.2, 6.6
Mar., 2004 SH(NA)-080351E-C Addition
Section 4.5.2, 4.5.3
Partial correction
Section 1.2, 3.1, 4.1, 4.2.3, 4.5, 4.5.4, 6.7
Jan., 2005 SH(NA)-080351E-D Partial correction
SAFETY PRECAUTIONS, Generic Terms and Abbreviations,
Section 1.1, 2.1, 2.2.2, 2.2.3, 3.1, 3.1.1, 3.3.2, 4.1, 4.2.1, Chapter 5,
Section 6.2, 6.3.1 to 6.3.4, 6.4, 6.4.1 to 6.4.5, 6.6, 6.7
Mar., 2006 SH(NA)-080351E-E Partial correction
SAFETY PRECAUTIONS, Conformation to the EMC Directive and Low
Voltage Instruction, Section 2.2.1, 2.2.2, 3.1.1
Nov., 2006 SH(NA)-080351E-F Partial correction
INDEX
Oct., 2008 SH(NA)-080351E-G Partial correction
SAFETY PRECAUTIONS, Compliance with the EMC and Low Voltage
Directives, Generic Terms and Abbreviations, Section 2.2.1, 2.2.3, 4.1,
4.2.1, 4.3, 4.5, 6.7, Appendix 1
Japanese Manual Version SH-080344-H
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.
©2002 MITSUBISHI ELECTRIC CORPORATION

A - 5 A - 5
INTRODUCTION
Thank you for purchasing the MELSEC-Q series programmable controller. Before using the product, read
this manual carefully to fully understand the functions and the performance of the programmable controller.
Please forward a copy of this manual to the end user.
CONTENTS
SAFETY PRECAUTIONS..............................................................................................................................A- 1
REVISIONS ....................................................................................................................................................A- 4
INTRODUCTION............................................................................................................................................A- 5
Compliance with the EMC and Low Voltage Directives................................................................................A- 8
Generic Terms and Abbreviations .................................................................................................................A- 8
Packing List ....................................................................................................................................................A- 9
1. OVERVIEW 1- 1 to 1- 3
1.1 Overview................................................................................................................................................... 1- 1
1.2 Features ................................................................................................................................................... 1- 2
2. SYSTEM CONFIGURATION 2- 1 to 2- 10
2.1 Overall Configuration ............................................................................................................................... 2- 1
2.2 Applicable System.................................................................................................................................... 2- 2
2.2.1 Applicable Modules and Numbers of Available Modules ................................................................ 2- 2
2.2.2 Notes on System Configuration........................................................................................................ 2- 5
2.2.3 Confirmation of Function Version ..................................................................................................... 2- 9
3. SPECIFICATIONS 3- 1 to 3-16
3.1 Performance Specifications ..................................................................................................................... 3- 1
3.1.1 Network Wiring Specifications .......................................................................................................... 3- 2
3.2 I/O Signals to/from Programmable Controller CPU ................................................................................ 3- 4
3.2.1 I/O Signals in 4-Point Mode Setting.................................................................................................. 3- 4
3.2.2 I/O Signals in 8-Point Mode Setting.................................................................................................. 3- 5
3.2.3 I/O Signals in 16-Point Mode Setting................................................................................................ 3- 5
3.3 Buffer Memory.......................................................................................................................................... 3- 6
3.3.1 List of Buffer Memory ........................................................................................................................ 3- 6
3.3.2 Details of Buffer Memory .................................................................................................................. 3- 6
3.4 Concept of Control Point (Point Mode Setting and I/O Point Setting).................................................... 3-10
3.4.1 Simplified Setting............................................................................................................................... 3-10
3.4.2 Advanced Setting .............................................................................................................................. 3-10
3.5 Concept of Last Station Number Setting................................................................................................. 3-13
3.6 Condition of Each Station in Case of Failure .......................................................................................... 3-13
3.7 Data Link Processing Time...................................................................................................................... 3-14
3.7.1 Link Scan Time.................................................................................................................................. 3-14
3.7.2 Transmission Delay Time ................................................................................................................. 3-15

A - 6 A - 6
4. PREPARATORY PROCEDURES FOR DATA LINK 4- 1 to 4-19
4.1 Procedures for Data Link ......................................................................................................................... 4- 1
4.2 Installation ................................................................................................................................................ 4- 3
4.2.1 Handling Precautions ........................................................................................................................ 4- 3
4.2.2 Installation Environment.................................................................................................................... 4- 3
4.2.3 Cables, Connectors and Terminating Resistors ..............................................................................4- 3
4.3 Name of Parts and Setting....................................................................................................................... 4- 4
4.4 Switch Setting of Intelligent Function Module ......................................................................................... 4- 6
4.5 Connecting Modules with Cables ............................................................................................................ 4- 8
4.5.1 How to Connect Connector for Dedicated Flat Cable...................................................................... 4- 9
4.5.2 How to Connect VCTF or High Flexible Cable Connector .............................................................. 4-11
4.5.3 Mixture of Different Kinds of Cables ................................................................................................. 4-14
4.5.4 Installing Terminating Resistors........................................................................................................ 4-17
4.5.5 Check of Wiring ................................................................................................................................. 4-18
4.6 Installing/Removing Remote Station ....................................................................................................... 4-19
5. PROGRAMMING 5- 1 to 5- 2
5.1 System Configuration............................................................................................................................... 5- 1
5.2 Devices Available for Users..................................................................................................................... 5- 2
5.3 Program Example .................................................................................................................................... 5- 2
6. TROUBLESHOOTING 6- 1 to 6-18
6.1 Condition of Each Station in Case of Failure .......................................................................................... 6- 1
6.2 Troubleshooting Flow............................................................................................................................... 6- 2
6.3 Troubleshooting of Master Station........................................................................................................... 6- 3
6.3.1 When "RUN" LED Goes Off.............................................................................................................. 6- 3
6.3.2 When "L RUN" LED Goes Off........................................................................................................... 6- 4
6.3.3 When "ERR." LED Lights Up or Blinks............................................................................................. 6- 5
6.3.4 When "L ERR." LED Lights Up or Blinks.......................................................................................... 6- 6
6.4 Troubleshooting of Remote I/O Station(s)............................................................................................... 6- 7
6.4.1 When "PW" LED Goes Off................................................................................................................ 6- 7
6.4.2 When "L RUN" LED Goes Off........................................................................................................... 6- 8
6.4.3 When "L ERR." LED Lights Up ......................................................................................................... 6- 9
6.4.4 When Input From Remote I/O Station Is Not Possible .................................................................... 6-10
6.4.5 When Output From Remote I/O Station Is Not Possible ................................................................. 6-11
6.5 Error Codes .............................................................................................................................................. 6-12
6.6 CC-Link/LT Diagnostics Using GX Developer ........................................................................................ 6-13
6.7 Check of Module Condition (Self-loopback Test) ................................................................................... 6-18

A - 7 A - 7
APPENDIX App- 1 to App- 4
Appendix 1 External Dimensions...............................................................................................................App- 1
Appendix 2 I/O Assignment Sheet.............................................................................................................App- 2
Appendix 2.1 I/O Assignment Sheet for 4-Point Mode Setting............................................................App- 2
Appendix 2.2 I/O Assignment Sheet for 8-Point Mode Setting............................................................App- 3
Appendix 2.3 I/O Assignment Sheet for 16-Point Mode Setting..........................................................App- 4
INDEX Index- 1 to Index- 2

A - 8 A - 8
Compliance with the EMC and Low Voltage Directives
(1) For programmable controller system
To configure a system meeting the requirements of the EMC and Low Voltage Directives when
incorporating the Mitsubishi programmable controller (EMC and Low Voltage Directives
compliant) into other machinery or equipment, refer to Chapter 9 "EMC AND LOW VOLTAGE
DIRECTIVES" of the QCPU User's Manual (Hardware Design, Maintenance and Inspection).
The CE mark, indicating compliance with the EMC and Low Voltage Directives, is printed on the
rating plate of the programmable controller.
(2) For the product
No additional measures are necessary for the compliance of this product with the EMC and Low
Voltage Directives.
Generic Terms and Abbreviations
This manual uses the following generic terms and abbreviations except for the case where precise
specification is required.
Generic Term/Abbreviation Description
QJ61CL12 Indicates QJ61CL12 type CC-Link/LT master module
Master station Station that controls data link system. One master station is required for each system.
Remote I/O station Remote station that handles bit information only. (Inputs/outputs data to/from external
devices) (CL2X8-D1B2, CL2Y8-TP1B2, etc.)
Remote device station Remote station that handles bit unit and word unit data only. (Performs input and
output with external devices, and analog data conversion.)
Remote station Generic term for remote I/O station and remote device station.
Controlled by the master station.
Master module Module that controls the data link system.
One master module is required for each system.
Remote I/O module Remote module that handles bit unit data only. (Performs input and output with
external devices.)
Remote device module Remote module that handles bit unit and word unit data only. (Performs input and
output with external devices, and analog data conversion.)
Remote module Generic term for remote I/O module and remote device module.
Programmable controller CPU
Generic term for Q00JCPU, Q00CPU, Q01CPU, Q02CPU, Q02HCPU, Q06HCPU,
Q12HCPU, Q25HCPU, Q02PHCPU, Q06PHCPU, Q12PHCPU, Q25PHCPU,
Q12PRHCPU, Q25PRHCPU, Q02UCPU, Q03UDCPU, Q04UDHCPU, Q06UDHCPU,
Q13UDHCPU, Q26UDHCPU, Q03UDECPU, Q04UDEHCPU, Q06UDEHCPU,
Q13UDEHCPU, Q26UDEHCPU.
C Controller module Generic term for the Q06CCPU-V, Q06CCPU-V-B.
GX Developer
Generic product name for SWnD5C-GPPW-E, SWnD5C-GPPW-EA, SWnD5C-GPPW-
EV, and SWnD5C-GPPW-EVA. ("n" means version 4 or later.)
"-A" and "-V" mean "volume license product" and "version-upgrade product"
respectively.
Intelligent function module Q series module other than CPU, power supply and I/O modules, which are to be
mounted on base unit
Dedicated power supply
Power supply adapter
Module connected for power supply to CC-Link/LT system. At least one power supply
adapter is required for a system.

A - 9 A - 9
Packing List
The packing list of QJ61CL12 is as shown below.
Item name Quantity
QJ61CL12 CC-Link/LT master module 1

1 - 1 1 - 1
MELSEC-Q
1 OVERVIEW
1 OVERVIEW
This manual describes about the QJ61CL12 type CC-Link/LT Master Module
(hereinafter shown as QJ61CL12), including its specifications, names of the parts and
the setting. The QJ61CL12 is designed for the use in combination with the MELSEC-
Q series programmable controller CPU.
1.1 Overview
The CC-Link/LT is a line-saving network system designed for the use inside control
boxes or devices, and you will be free from complicated or incorrect wiring.
Wiring among sensors, actuators and controllers can be easily saved and excellent
performance such as high-speeded response time can be realized by this.
Remote Module
Power Supply Adapter
Terminating Resistor
QJ61CL12
24V DC
CL1Y4-T1B2
CL1PAD1
CC-Link/LT
Master Module
General Power Supply
Partner
Company's
Product
Terminating Resistor
CL2AD4-B
Y0
1

1 - 2 1 - 2
MELSEC-Q
1 OVERVIEW
1.2 Features
The CC-Link/LT features the following:
(1) Easy connection/disconnection of communication cable
Because a dedicated connector enables simple connection/disconnection of the
communication cables, modules can be easily added and/or replaced.
Using dedicated flat cables, VCTF cables and/or high flexible cables will
decrease the wiring steps and save the cost of the cables.
(2) No parameter settings
To operate the CC-Link/LT system, no parameters are required to be set.
(3) Simplified programming
Since link devices of the CC-Link/LT are allocated to X/Y devices of the
programmable controller CPU, you can create programs with X/Y devices only
and not have to pay attention to the entire network.
X
Y
X
Y
X
Y
Programmable
controller CPU Master station Remote station
Refresh of X
Refresh of Y
Link scan
Link scan
Input
Output
(4) Transmission speed auto-tracking function
The transmission speed should be set on the master module only. No setting is
required for remote stations.
(5) CC-Link/LT diagnosis
Operating state of the master station, presence of faulty station and other states
can be checked by CC-Link/LT diagnostics of the GX Developer and this enables
easy maintenance of the system.
<Line Monitor [Host station] screen> <Loop test screen>
1

1 - 3 1 - 3
MELSEC-Q
1 OVERVIEW
(6) Specification of refresh range
Setting the last station number will stop refreshing for unconnected stations and
reduce the link scan time.
(7) High speed refresh
High speed refreshing of 256 points for 0.5 ms can be achieved. (When 16
modules are connected in 16-point mode at a transmission speed of 2.5 Mbps)
(8) Point mode setting
Setting of “occupied points” and “numbers of I/O points” per station allows
effective use of the I/O points.
(9) Bulk I/O control
The maximum of 2048 points (X: 1024; Y: 1024) can be controlled.
(10) Station detach function
Even if some module goes down due to an error, communications among normal
modules can be continued.
However, cable breakage of the trunk line will disable the data link of all stations.
(11) Automatic return function
When the module isolated due to an error recovers its normal state, it will
automatically return to the data link.
(12) Stop/restart of data link
You can stop and restart the module while the data link is being executed.
(13) Storing data by remote station type
Through the initial communication after powering on or adding a remote station,
occupied points, I/O types or other information will be detected and stored in the
buffer memory.

2 - 1 2 - 1
MELSEC-Q
2 SYSTEM CONFIGURATION
2 SYSTEM CONFIGURATION
This section mainly describes the system configuration of the CC-Link/LT.
2.1 Overall Configuration
To one master station, up to 64 remote stations can be connected.
However, the conditions shown in Table 2.1 should be satisfied.
Table 2.1 Network Wiring Specifications
Item Specifications Remarks
Transmission speed 2.5 Mbps 625 kbps 156kbps
Distance between stations Not limited
Max. no. of modules per drop line 8 modules
Length of trunk line 35 m 100 m 500 m Cable length between terminating resistors.
Length of drop lines not included
T-branch interval Not limited
Max. length of drop line 4 m 16 m 60 m Max. cable length for one branch line
Overall length of drop lines 15 m 50 m 200 m Total length of all drop lines
Interval length of T-branch
T-branch
connection
*1
*2
Length of trunk line (Drop line not included)
Master station
Length
of
drop
line Power
supply
adapter
Length of drop line
Terminating
resistor
Terminating
resistor
Distance
between stations Trunk line
Drop line
Remote
station
*3 *3
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
*1: The length of the drop line includes the length of *2. (The maximum length of drop line and
overall length of drop lines also include the length marked *2.)
*3: Refer to Section 4.5.4 for the terminating resistor installing method.
POINT
(1) The connection order of remote stations is not related with the station numbers.
(2) The remote station numbers are not necessarily consecutive. (Leaving any
station number out does not cause data link failure.)
2

2 - 2 2 - 2
MELSEC-Q
2 SYSTEM CONFIGURATION
2.2 Applicable System
This section provides information on the available CPU module and notes on system
configuration.
2.2.1 Applicable Modules and Numbers of Available Modules
(1) Applicable modules and base units, and No. of modules
(a) When mounted with a CPU module
The table below shows the CPU modules and base units applicable to the
QJ61CL12 and quantities for each CPU model.
Depending on the combination with other modules or the number of
mounted modules, power supply capacity may be insufficient.
Pay attention to the power supply capacity before mounting modules, and if
the power supply capacity is insufficient, change the combination of the
modules.
Applicable CPU module Base unit(*2)
CPU type CPU model
No. of
modules(*1) Main base unit Extension base unit
Q00JCPU Up to 16
Q00CPU
Basic model QCPU
Q01CPU Up to 24
Q02CPU
Q02HCPU
Q06HCPU
Q12HCPU
High Performance model
QCPU
Q25HCPU
Up to 64
Q02PHCPU
Q06PHCPU
Q12PHCPU
Process CPU
Q25PHCPU
Up to 64
Q12PRHCPU
Redundant CPU Q25PRHCPU Up to 53
Q02UCPU Up to 36
Q03UDCPU
Q04UDHCPU
Q06UDHCPU
Q13UDHCPU
Q26UDHCPU
Q03UDECPU
Q04UDEHCPU
Q06UDEHCPU
Q13UDEHCPU
Universal model QCPU
Q26UDEHCPU
Up to 64
Programmable
controller CPU
Safety CPU QS001CPU N/A (*3)
Q06CCPU-V
C Controller module Q06CCPU-V-B Up to 64
: Applicable, : N/A
*1: The number varies depending on the I/O points of the CPU module and the
number of occupied I/O points set in QJ61CL12.
*2: Can be installed to any I/O slot of a base unit.
*3: Connection of extension base units is not available with any safety CPU.
2

2 - 3 2 - 3
MELSEC-Q
2 SYSTEM CONFIGURATION
REMARK
For use of a C Controller module, refer to the C Controller Module User’s Manual.
(b) Mounting to a MELSECNET/H remote I/O station
The table below shows the network modules and base units applicable to
the QJ61CL12 and quantities for each network module model.
Depending on the combination with other modules or the number of
mounted modules, power supply capacity may be insufficient.
Pay attention to the power supply capacity before mounting modules, and if
the power supply capacity is insufficient, change the combination of the
modules.
No. of modules(*2)
Applicable CPU
module No. of modules(*1) Main base unit of
remote I/O station
Extension base unit
of remote I/O station
QJ72LP25-25
QJ72LP25G
QJ72LP25GE
QJ72BR15
Up to 64
: Applicable, : N/A
*1: Limited within the range of I/O points for the network module.
*2: Can be installed to any I/O slot of a base unit.
REMARK
The Basic model QCPU or C Controller module cannot create the MELSECNET/ H
remote I/O network.
(2) Application to multiple CPU system
When applying the QJ61CL12 to a multiple CPU system, see the QCPU User’s
Manual (Multiple CPU System) in advance.
(a) QJ61CL12 available for multiple CPU system
The function version of the first released QJ61CL12 is B, and it supports
multiple CPU systems.
(b) Parameters of intelligent function modules
Write the parameters of intelligent function modules to only the control CPU
of QJ61CL12.

2 - 4 2 - 4
MELSEC-Q
2 SYSTEM CONFIGURATION
(4) Applicable software package
The systems and software packages available for the QJ61CL12 are shown
below.
When using the QJ61CL12, GX Developer is indispensable.
Software version
GX Developer
Single CPU system Version 7 or later
Q00J/Q00/Q01CPU Multiple CPU system Version 8 or later
Single CPU system Version 4 or later
Q02/Q02H/Q06H/Q12H/Q25HCPU Multiple CPU system Version 6 or later
Single CPU system
Q02PH/Q06PHCPU Multiple CPU system Version 8.68W or later
Single CPU system
Q12PH/Q25PHCPU Multiple CPU system Version 7.10L or later
Q12PRH/Q25PRHCPU Redundant system Version 8.45X or later
Single CPU system
Q02U/Q03UD/Q04UDH/Q06UDHCPU Multiple CPU system Version 8.48A or later
Single CPU system
Q13UDH/Q26UDHCPU Multiple CPU system Version 8.62Q or later
Single CPU systemQ03UDE/Q04UDEH/Q06UDEH/
Q13UDEH/Q26UDEHCPU Multiple CPU system Version 8.68W or later
When installing to MELSECNET/H remote I/O station Version 6 or later
When executing CC-Link/LT diagnosis Version 7.17T or later

2 - 5 2 - 5
MELSEC-Q
2 SYSTEM CONFIGURATION
2.2.2 Notes on System Configuration
(1) Position of QJ61CL12
Be sure to place the QJ61CL12 on the end of the trunk line.
It may seem to be placed at any other point than both ends of the trunk line in
appearance because of application of the T-branch connection. Note that the
length of the trunk line is defined as the length between two terminating resistors.
*1
*2
*2 *2 *2
Master station
Terminating resistor
Length of drop line
Length of trunk line
Length
of
drop
line
*1
Terminating
resistor Power
supply
adapter
Length of drop line Distance
between stations Trunk line
Drop line
Remote
station
*3
*3
*3
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
Remote
station
*1: The length of the drop line includes the length of *2. (The maximum length of drop line and
overall length of drop lines also include the length marked *2.)
*3: Refer to Section 4.5.4 for the terminating resistor installing method.

2 - 6 2 - 6
MELSEC-Q
2 SYSTEM CONFIGURATION
(2) Number of drop line stages
The drop line in the CC-Link/LT system may be branched in up to two stages.
It cannot be branched in three or more stages.
Trunk line
Drop line
Third drop line branch stage: cannot be wired.
Remote
station
Remote
station
Remote
station
(3) Conditions for setting of dedicated power supply or power supply
adapter
The conditions for the setting of a dedicated power supply or power supply
adapter for the CC-Link/LT vary depending on the devices to be connected and
the wiring length.
See the User’s Manual of the dedicated power supply or power supply adapter
for the conditions.
POINT
Always connect the dedicated power supply or power supply adapter to the trunk
line. (Connection to branch lines is not allowed.)
(4) Prevention of faulty input/output from remote I/O module
To prevent faulty input/output from remote I/O modules, pay attention to the
following when designing the system.
(a) When power is ON or OFF
Turn ON the remote I/O module (Turn on the dedicated power supply or
power supply adapter) before starting the data link.
Also, stop the data link before turning OFF the remote I/O module (Turning
off the dedicated power supply or power supply adapter).
ON
OFF
Data link start Data link stop
Executed
Stopped
Master module
(Data link status)
Remote I/O module
(Power status)