Mitsubishi QJ71DN91 User manual

DeviceNetMaster-SlaveModuleUser'sManual
U
User's Manual User's Manual
Mitsubishi Programmable
Logic Controller
When exported from Japan, this manual does not require application to the
Ministry of International Trade and Industry for service transaction permission.
Specifications subject to change without notice.
Printed in Japan on recycled paper.
HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100-8310 TELEX : J24532 CABLE MELCO TOKYO
NAGOYA WORKS : 1-14 , YADA-MINAMI 5 , HIGASHI-KU, NAGOYA , JAPAN
MODEL
MODEL
CODE
QJ71DN91-U-S-E
13JR32
SH(NA)-080143-A(0101)MEE
DeviceNet Master-Slave Module DeviceNet Master-Slave Module
QJ71DN91
GX Configurator-DN
(SW1D5C-QDNU-E)

A - 1 A - 1
•SAFETY PRECAUTIONS •
(Always read these instructions before using this equipment.)
Before using this product, please read this manual and the relevant manuals introduced in this manual
carefully and pay full attention to safety to handle the product correctly.
The instructions given in this manual are concerned with this product. For the safety instructions of the
programmable controller system, please read the user's manual of the CPU module to use.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
!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 the !CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[DESIGN PRECAUTIONS]
!DANGER
•If a communications error occurs to a device network, the node in such a communications error
will be in a state as follows:
(1) The master node (QJ71DN91) maintains input data which had been received from the slave
node before the error occurred.
(2) Whether the slave node's output signal is turned off or maintained is determined by the
slave node's specifications or the parameters set at the master node. When using
QJ71DN91 as a slave node, the entered data from master node before the faulty node is
maintained.
By referring to communications states of the slave node, arrange an interlock circuit in a
sequential program and provide safety mechanism externally of the slave node in order the
system to operate safely.
!CAUTION
•Do not bunch the control wires or communication cables with the main circuit or power wires, or
install them close to each other.
They should be installed 300 mm (11.8 inch) or more from each other. Not doing so could result
in noise that may cause malfunction.

A - 2 A - 2
[INSTALLATION PRECAUTIONS]
!CAUTION
•Use the PLC in an environment that meets the general specifications contained in the CPU
User's manual to use.
Using this PLC in an environment outside the range of the general specifications may cause
electric shock, fire, malfunction, and damage to or deterioration of the product.
•When installing the module, securely insert the module fixing tabs into the mounting holes of the
base module while pressing the installation lever located at the bottom of the module downward.
Improper installation may result in malfunction, breakdown or dropping out of the module.
Securely fix the module with screws if it is subject to vibration during use.
•Tighten the screws within the range of specified torque.
If the screws are loose, it may cause fallout, short circuits, or malfunction.
If the screws are tightened too much, it may cause damage to the screw and /or the module,
resulting in fallout, short circuits or malfunction.
•Switch all phases of the external power supply off when mounting or removing the module.
Not doing so may cause electric shock or damage to the module.
•Do not directly touch the conductive area or electric components of the module.
Doing so may cause malfunction or failure in the module.
[WIRING PRECAUTIONS]
!DANGER
•Make sure to shut off all the phases of the external power supply before starting installation or
wiring. Otherwise, the personnel may be subjected to an electric shock or the product to a
damage.
!CAUTION
•Be careful not to let foreign matters such as sawdust or wire chips get inside the module.
These may cause fires, failure or malfunction.
•The top surface of the module is covered with protective film to prevent foreign objects such as
cable offcuts from entering the module when wiring.
Do not remove this film until the wiring is complete.
Before operating the system, be sure to remove the film to provide adequate heat ventilation.
•Be sure to fix cables leading from the module by placing them in the duct or clamping them.
Unless the cables are placed with a duct or clamped, the module or cables could be broken by
swinging or moving of the cables or unintentional pulling to cause an operation error resulting
from a contact error.
•Do not pull cables by holding them with a hand for removing the cables that are connected to the
module. To remove a cable having a connector, hold the connector connected to the module
with a hand. To remove a cable not having a connector, loosen the screws fastening to connect
the module. The cables being pulled while they are still connected to the module could break the
module or cables, or cause an operation error resulting from a contact error.

A - 3 A - 3
[CAUTIONS ON STARTUP AND MAINTENANCE]
!DANGER
•Always turn off all external power supply phases before touching any terminals.
Failure to do this may result in malfunction.
•Always turn of all external power supply phases before cleaning or tightening the terminal
screws.
Failure to do this may result in malfunction.
•Do not disassemble or modify any module.
This will cause failure, malfunction, injuries, or fire.
•Always turn off all external power supply phases before mounting or dismounting the module.
Failure to do this may result in malfunction or damage to the module.
[DISPOSAL PRECATION]
!CAUTION
•Dispose of this product 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
Dec., 2000 SH (NA) 080143-A First Printing
Jun., 2001 SH (NA) 080143-B Addition
Section 2.3, 2.4
Delete
Section 2.2.1, 2.2.2
Correction
SAFETY PRECAUTIONS, About the Generic Terms and Abbreviations,
Product Configuration, Section 2.2, 2.4, Section 6.2, 6.2.1, 6.2.2, 6.3.3,
6.5
Feb., 2002 SH (NA) 080143-C Correction
About the Generic Terms and Abbreviations, Section 2.2, Section 6.2.1,
6.2.2
Japanese Manual Version SH-080125-C
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 - 5 A - 5
INTRODUCTION
Thank you for purchasing the MELSEC-Q series PLC.
Before using the equipment. please read this manual carefully to develop full familiarity with the functions
and performance of the Q series PLC you have purchased, so as to ensure correct use.
Please forward a copy of this manual to the end user.
CONTENTS
SAFETY PRECAUTIONS..............................................................................................................................A- 1
REVISIONS....................................................................................................................................................A- 4
Conformation to the EMC Directive and Low Voltage Instruction ................................................................A- 8
About the Generic Terms and Abbreviations................................................................................................A- 8
Product Configuration ....................................................................................................................................A- 9
1 OVERVIEW 1- 1 to 1- 2
1.1 Features ..................................................................................................................................................1- 1
2 SYSTEM CONFIGURATION 2- 1 to 2- 5
2.1 Overall Configuration..............................................................................................................................2- 1
2.2 Applicable Systems.................................................................................................................................2- 3
2.3 How to Check the Function Version, Serial No. and Software Version................................................2- 4
2.4 About Use of the QJ71DN91 with the Q00J/Q00/Q01CPU ..................................................................2- 5
2.5 Compatible DeviceNet Products from Other Manufacturers.................................................................2- 5
3 SPECIFICATIONS 3- 1 to 3- 50
3.1 Performance Specifications....................................................................................................................3- 1
3.1.1 Maximum transmitting distance when thick and thin cables coexist..............................................3- 1
3.2 Functions.................................................................................................................................................3- 2
3.2.1 Master function (I/O communication function).................................................................................3- 2
3.2.2 Master function (Message communication function) ......................................................................3- 8
3.2.3 Slave function (I/O communication function)...................................................................................3-11
3.3 I/O Signals for the PLC CPU ..................................................................................................................3-13
3.3.1 I/O signal list.....................................................................................................................................3-13
3.3.2 Details of the I/O signals..................................................................................................................3-14
3.4 Buffer Memory.........................................................................................................................................3-24
3.4.1 Buffer memory list ............................................................................................................................3-24
3.4.2 Buffer memory details......................................................................................................................3-26
3.5 Communication Performance.................................................................................................................3-49
3.5.1 Scan time..........................................................................................................................................3-49
3.5.2 Communication cycle.......................................................................................................................3-50
3.5.3 Transmission delays ........................................................................................................................3-50

A - 6 A - 6
4 SETUP AND PROCEDURES BEFORE OPERATION 4- 1 to 4-14
4.1 Setup and Procedures before Operation ...............................................................................................4- 1
4.1.1 When using the master function......................................................................................................4- 1
4.1.2 When using the slave function.........................................................................................................4- 2
4.1.3 When using both the master function and slave function...............................................................4- 3
4.2 Loading and Installation..........................................................................................................................4- 4
4.2.1 Handling precautions .......................................................................................................................4- 4
4.2.2 Installation environment...................................................................................................................4- 4
4.3 Component Names and Settings ...........................................................................................................4- 5
4.3.1 Meanings of the LED displays.........................................................................................................4- 6
4.3.2 Node number setting switch.............................................................................................................4- 7
4.3.3 Mode switch......................................................................................................................................4- 7
4.4 Hardware Test.........................................................................................................................................4- 8
4.5 Connecting the Communication Cables to the QJ71DN91...................................................................4- 9
4.6 Communication Test...............................................................................................................................4-10
4.7 Instructions for Connecting the Network Power Supply........................................................................4-11
4.7.1 Network power supply unit installation position...............................................................................4-11
4.7.2 Calculating network power supply unit installation position and current capacity..........................4-12
5 PARAMETER SETTINGS 5- 1 to 5- 6
5.1 Description of Parameter Settings..........................................................................................................5- 1
5.1.1 Parameters for the master function.................................................................................................5- 1
5.1.2 Parameters for the slave function....................................................................................................5- 2
5.1.3 Common parameters for the master/slave functions......................................................................5- 2
5.2 Setting Using the Sequence Program....................................................................................................5- 2
5.3 Setting Using the Auto Configuration Function......................................................................................5- 3
6 UTILITY PACKAGE (GX CONFIGURATOR-DN) 6- 1 to 6-21
6.1 Functions of the Utility Package.............................................................................................................6- 1
6.2 Installing and Uninstalling the Utility Package........................................................................................6- 2
6.2.1 User precautions..............................................................................................................................6- 2
6.2.2 Operating environment.....................................................................................................................6- 4
6.3 Explanation of Utility Package Operation...............................................................................................6- 5
6.3.1 How to perform common utility package operations.......................................................................6- 5
6.3.2 Overview of operation......................................................................................................................6- 8
6.3.3 Starting the intelligent function module utility..................................................................................6-10
6.4 Auto Refresh Settings.............................................................................................................................6-12
6.5 Monitor/Test ............................................................................................................................................6-14
6.6 Flash ROM Settings................................................................................................................................6-20

A - 7 A - 7
7 PROGRAMMING WHEN EXECUTING THE MASTER FUNCTION 7- 1 to 7-12
7.1 Precautions on Programming.................................................................................................................7- 1
7.2 System Configuration..............................................................................................................................7- 2
7.3 Setting Parameters .................................................................................................................................7- 4
7.3.1 Parameter settings using the sequence program...........................................................................7- 4
7.3.2 Creating parameters using auto configuration................................................................................7- 6
7.3.3 Saving parameters in flash ROM.....................................................................................................7- 6
7.4 I/O Communication with Slave Nodes....................................................................................................7- 7
7.5 Performing Message Communication....................................................................................................7- 8
7.5.1 Example of message communication read.....................................................................................7- 8
7.5.2 Example of message communication write.....................................................................................7- 9
7.6 Obtaining Error Information ....................................................................................................................7-10
7.7 Allocating Transmission/Reception Data Storage Devices for Future Expansion................................7-11
8 PROGRAMMING WHEN EXECUTING THE SLAVE FUNCTION 8- 1 to 8- 4
8.1 System Configuration..............................................................................................................................8- 1
8.2 Setting Parameters Using the Sequence Program................................................................................8- 2
8.3 I/O Communication with the Master Node .............................................................................................8- 3
8.4 Obtaining Error Information ....................................................................................................................8- 4
9 TROUBLESHOOTING 9- 1 to 9-12
9.1 Items to Check When an Error Occurs ..................................................................................................9- 2
9.1.1 Checking the LEDs ..........................................................................................................................9- 2
9.1.2 When communication with all slave nodes cannot be performed (using the master function).....9- 3
9.1.3 When communication with a specific slave node cannot be performed
(using the master function)..............................................................................................................9- 4
9.1.4 When communication with the master node cannot be performed (using the slave function)......9- 5
9.2 Error Codes.............................................................................................................................................9- 6
9.2.1 Communication error codes.............................................................................................................9- 6
9.2.2 Execution error codes of message communication (using the master function only) ...................9- 9
9.3 Verifying the QJ71DN91 Status on the GX Developer System Monitor...............................................9-11
APPENDIX App- 1 to App- 7
Appendix 1 External Dimension Diagram ................................................................................................App- 1
Appendix 2 Differences between the QJ71DN91 and the AJ71DN91/A1SJ71DN91............................App- 2
Appendix 3 Parameter Setting Sheet (For the Master Function) ............................................................App- 3
Appendix 4 Parameter Setting Sheet (For the Slave Function) ..............................................................App- 4
Appendix 5 List of Communication Parameters of Slave Nodes Manufactured by Various
Manufacturers........................................................................................................................App- 5
Appendix 6 EDS File of the QJ71DN91 ...................................................................................................App- 6
INDEX Ind- 1 to Ind- 2

A - 8 A - 8
Conformation to the EMC Directive and Low Voltage Instruction
For details on making Mitsubishi PLC conform to the EMC directive and low voltage instruction when
installing it in your product, please see Chapter 3, "EMC Directive and Low Voltage Instruction" of the User's
Manual (Hardware) of the PLC CPU to use.
The CE logo is printed on the rating plate on the main body of the PLC that conforms to the EMC directive
and low voltage instruction.
BY making this product conform to the EMC directive and low voltage instruction, it is not necessary to make
those steps individually.
About the Generic Terms and Abbreviations
Unless otherwise specified, this manual uses the following generic terms and abbreviations to explain
QJ71DN91 DeviceNet Master·Slave Module.
Generic Term/Abbreviation Description
GX Developer Generic product name of the product types SWnD5C-GPPW-E, SWnD5C-GPPW-EA, SWnD5C-GPPW-EV and SWnD5C-GPPW-EVA.
"n" in the model is 4 or greater.
QCPU (Q mode) Generic term for Q00JCPU, Q00CPU, Q01CPU, Q02CPU, Q02HCPU, Q06HCPU,
Q12HCPU, Q25HCPU, Q12PHCPU, Q25PHCPU
GX Configurator-DN Abbreviation for DeviceNet Master-Slave Module setting/Monitor Tool GX
Configurator-DN (SW1D5C-QDNU-E)
QJ71DN91 Abbreviation for QJ71DN91 DeviceNet Master-Slave Module
Personal computer IBM PC/AT®or compatible computer with DOS/V.

A - 9 A - 9
Product Configuration
The following is a list of the components in this product configuration.
Model name Product name Quantity
QJ71DN91 DeviceNet master-slave module 1
Terminal resistor 121Ω, 1/4W 2 QJ71DN91 Connector 1
SW1D5C-QDNU-E GX Configurator-DN Version 1 (1-license product) (CD-ROM) 1
SW1D5C-QDNU-EA GX Configurator-DN Version 1 (Multiple-license product) (CD-ROM) 1

1 - 1 1 - 1
MELSEC-Q
1 OVERVIEW
1 1 OVERVIEW
This manual explains the specifications and name of each component of the
QJ71DN91 DeviceNet master/slave module, which is used in combination with the
MELSEC-Q Series PLC CPU.
Please see DeviceNet Specification Manual (Release 2.0), Volumes 1 and 2, for the
specifications of DeviceNet.
DeviceNet is a registered trademark of Open DeviceNet Vendor Association, Inc.
POINT
Most of the DeviceNet products on the market are assumed to be compatible.
However, compatibility with the products of other manufacturers is not guaranteed.
1.1 Features
This section explains the features of the QJ71DN91.
(1) The module conforms to the DeviceNet Specifications Manual (Release 2.0).
(2) The module can function as a master node, slave node, or master/slave node of
DeviceNet.
Master made by
other manufacturer
24V power
supply
Master station
MS
Slave side
I/O communication between the master station and slave station is possible.
Communication is not possible.
: DeviceNet slave
M
S
(Node No. 10)
(Node No. 2)
S
S
S
(Node No. 4)
QJ71DN91 slave
(Node No. 3)
MM
S
S
S
(Node No. 7)
(Node No. 8)
MS
QJ71DN91
master
(Node No. 5)
QJ71DN91
master + slave
(Node No. 6)
QJ71DN91
slave
(Node No. 9)
QJ71DN91 slave
(Node No. 1)
(3) The parameters of QJ71DN91 can be set by any of the following three methods:
• Setting the parameters using GX Configurator-DN
• Setting the parameters using the TO instruction of a sequence program
• Setting the parameters using auto configuration

1 - 2 1 - 2
MELSEC-Q
1 OVERVIEW
1
(4) When the module functions as a master node of DeviceNet, I/O communication
and message communication with a DeviceNet slave node are possible.
(5) When the module functions as a master node of DeviceNet, the module can
communicate with a maximum of 63 slave nodes.
(6) Selection is available from four types of I/O communication methods when this
module functions as a master node in DeviceNet. They are polling, bit strobe,
change-of-state and cyclic which are defined in DeviceNet.
However, only one type of communication method can be selected for each slave
node.
Slave node 1 Slave node 2 Slave node 3 Slave node 4
QJ71DN91
DeviceNet network
Polling
Bit strobe Cyclic
Change-of-state
For I/O communication, see Section 3.2.1.
(7) When the module functions as a master node of DeviceNet, an I/O communication
with input of 256 words (4,096 points) and output of 256 words (4,096 points) can
be performed.
(8) When the module functions as a master node of DeviceNet, a message
communication of 240 byte data can be performed at one time.
(9) When the module functions as a slave node of DeviceNet, I/O communication with
input of 64 words (1,024 points) and output of 64 words (1,024 points) can be
performed.
(10) When the module functions as a slave node of DeviceNet, I/O communication can
be performed via polling.

2 - 1 2 - 1
MELSEC-Q
2 SYSTEM CONFIGURATION
2
2 SYSTEM CONFIGURATION
This chapter explains the system configuration of DeviceNet.
2.1 Overall Configuration
A total of 64 modules including a master node, slave nodes and a master/slave node
can be connected.
Each node is connected via a tap from the trunk line or directly to the trunk line.
The following shows an example of a system configuration:
Terminal resistor
(121Ω, 1/4W)
Slave node
Slave node
Slave node Slave node
Terminal resistor
(121Ω, 1/4W)
Network power-supply
module (24V DC)
Tap
Drop line (branch line)
Power supply tap
Drop line
Trunk line (main line)
Master node
Slave node
1) The QJ71DN91 can be used as a master node, a slave node or a
master/slave node.
2) A combined maximum of 64 master node and slave nodes can be
connected.
3) There is no need to connect the master node and slave nodes in the
order of node number.
4) The network cable consists of trunk line (main line) and drop lines
(branch lines).
Terminal resistors are required on both sides of the trunk line.
5) It is necessary to connect the network power supply in order to supply
the power supply to the communication circuit in addition to the
operating power supply of each node.
6) Use the terminal resistors included in the package, or they must be
furnished by the user.

2 - 2 2 - 2
MELSEC-Q
2 SYSTEM CONFIGURATION
2
(1) Network specification
The following explains the network specifications of DeviceNet that uses the
QJ71DN91.
(a) Communication speed
The communication speed can be selected from 125kbaud, 250kbaud, or
500kbaud using the mode switch of the QJ71DN91.
The maximum cable length varies depending on the communication speed.
See Section 3.1, "Performance Specifications" for details.
(b) Supplying power to the network
The following describes the method of supplying network power to each
node:
1) Connect a dedicated power supply tap to the trunk-line cable and install
the network power-supply module.
2) The power is supplied from the network power-supply module to each
node via the network cable.
Remarks
Inquire to ODVA about the following devices required to construct a DeviceNet
network.
• Network power-supply module
• Power supply tap
• Tap
• Terminal resistor
• Network cable
Contact at ODVA is as follows:
Open DeviceNet Vendor Association, Inc.
Address
20423 State Road 7 - Suite 499 - Boca Raton, FL 33498 U.S.A.
TEL. [phone]
FAX. [phone] or [phone]

2 - 3 2 - 3
MELSEC-Q
2 SYSTEM CONFIGURATION
2.2 Applicable Systems
This section describes the system configuration for the QJ71DN91.
(1) Applicable module and the number of modules that can be installed
The following are the CPU module in which the QJ71DN91 can be installed and
the number of modules that can be installed.
Applicable module Number of modules that
can be installed Remarks
Q00JCPU Maximum 16
Q00CPU
Q01CPU Maximum 24 (1)
Q02CPU
Q02HCPU
Q06HCPU
Q12HCPU
Q25HCPU
Maximum 64 Can be installed in Q mode only
(1)
CPU module
Q12PHCPU
Q25PHCPU Maximum 64 (1)
1 See User's Manual (Function Explanation, Program Fundamentals) for the CPU module to use.
(2) Base unit in which the conversion module can be installed
The QJ71DN91 can be installed in any I/O slot ( 2) of the base unit. However, a
power shortage may occur depending on the combination with other installed
modules and the number of modules used, so always take into consideration the
power supply capacity when installing modules.
2 Limited to the range of the number of I/O points in the CPU module.
(3) Compatibility with a multiple PLC system
First read the QCPU (Q mode) (Function Explanation, Program Fundamentals)
user's manual if the QJ71DN91 is used with a multiple PLC system.
(a) Compatible QJ71DN91
Use a QJ71DN91 with function version B or higher if using the module in a
multiple PLC system.
(b) Intelligent function module parameters
Perform PLC write of the intelligent function module parameters to the
control PLC of the QJ71DN91 only.

2 - 4 2 - 4
MELSEC-Q
2 SYSTEM CONFIGURATION
(4) Software packages supported
Correspondence between systems which use QJ71DN91s and software
packages are as shown below.
The GX Developer is necessary when using a QJ71DN91.
Software Version
GX Developer GX Configurator-DN
If installed in the Q00J/Q00/ Q01CPU Version 7 or later Version 1.10L or later
If installed in the Q02/Q02H/Q06H/
Q12H/Q25HCPU Version 4 or later Version 1.00A or later
If installed in the Q12PH/Q25PHCPU Version 7.10L or later Version 1.13P or later
If installed in a multiple PLC system Version 6 or later Version 1.10B or later
(5) Precautions on wiring
In order to avoid the effects of noise, the DeviceNet communication cable, power
cable and signal lines for the I/O module should be installed in such a way that
they are sufficiently away from each other.
(6) Remote operation is not allowed from other DeviceNet node
Each DeviceNet node on DeviceNet cannot read/write/monitor the sequence
program or data of the PLC CPU where the QJ71DN91 is installed.
2.3 How to Check the Function Version, Serial No. and Software Version
This section describes how to check the function version and serial No. of the
QJ71DN91 and the GX Configurator-DN software version.
(1) How to check the function version and serial No. of the QJ71DN91
(a) To check the version using the "SERIAL column of the rating plate" located
on the side of the module
Function version
03052
Serial No. (first 5 digits)
(b) To check the version using the GX Developer
See Section 9.3 of this manual.

2 - 5 2 - 5
MELSEC-Q
2 SYSTEM CONFIGURATION
(2) How to check the GX Configuration-DN software version
The GX Configurator-DN software version can be checked in GX Developer's
"Product information" screen.
[Startup procedure]
GX Developer "Help" Product information
(In the case of GX Developer Version 7)
Software version
2.4 About use of the QJ71DN91 with the Q00J/Q00/Q01CPU
Here, use of the QJ71DN91 with the Q00J/Q00/Q01CPU is explained.
(1) Number of QJ71DN91 that can be installed when the Q00J/Q00/
Q01CPU is used.
See item 2.2 concerning the number of QJ71DN91 that can be installed when the
Q00J/Q00/Q01CPU is used.
(2) Limitations when using the Q00J/Q00/Q01CPU
When using Q00J/Q00/Q01CPU, use QJ71DN91 which function version is B and
first 5 digits of the serial No. is 03052 or later.
2.5 Compatible DeviceNet Products from Other Manufacturers
It is assumed that most of the DeviceNet products on the market are compatible.
However, compatibility with the products of other manufacturers is not guaranteed.

3 - 1 3 - 1
MELSEC-Q
3 SPECIFICATIONS
3
3 SPECIFICATIONS
3.1 Performance Specifications
This section explains the performance specifications for QJ71DN91, I/O signals for
PLC CPU and specifications for buffer memory.
See the PLC CPU user's manual to be used for the general specifications for
QJ71DN91.
Item Specifications
Node type Device net master (Group 2 only client)
Node numbers which can be set 0 to 63
Message connection 63
Number of
connections
that be
created I/O connection 63 (polling, bit strobe, change of state, cyclic)
Send Max. 4096 points (512 bytes), max. 256 bytes per 1 node
I/O
communica-
tion Receive Max. 4096 points (512 bytes), max. 256 bytes per 1 node
Send Max. 240 bytes
When
master
function Amount of
communica-
tion data Message
communica-
tion Receive Max. 240 bytes
Node type Device net slaves (Group 2 server)
Setting possible node number 0 to 63
Number of
connections
that can be
created
I/O connection 1 (polling)
Send Max. 1024 points (128 bytes)
When slave
function
Amount of
communica-
tion data
I/O
communica-
tion Receive Max. 1024 points (128 bytes)
Communications speed One speed can be selected from 125 kbps, 250 kbps and 500kbps.
Maximum transmitting distance of
trunk line Length of drop line
Communic
ations
speed Thick
Cables Thin Cables
Thick and
thin cables
coexist Maximum Total
125 kbaud 500 m 156 m
250 kbaud 250 m 78 m
Maximum cable length
500 kbaud 100 m 100 m See 3.1.1 6 m 39 m
Communication specifications
Current consumption required on the network (A) 0.03
Number of times to write flash ROM Max. 100000 times
No. of I/O occupied points 32 points (I/O allocation: Intelligent 32 points)
5 V DC internal current consumption (A) 0.17
Weight (kg) 0.11
: The maximum cable length complies with that in the device net specification (Release 2.0) Volumes 1 and 2.
3.1.1 Maximum transmitting distance when thick and thin cables coexist
The table below lists both the maximum transmitting distance when thick and thin
cables coexist.
Communication speed Maximum transmitting distance of trunk line when thick
and thin cables coexist
125 kbaud Thick cable length + 5 Thin Cable length < 500 m
250 kbaud Thick cable length +2.5 Thin cable length < 250 m
500 kbaud Thick cable length + Thin cable length < 100 m

3 - 2 3 - 2
MELSEC-Q
3 SPECIFICATIONS
3
3.2 Functions
This section explains the functions of the QJ71DN91.
3.2.1 Master function (I/O communication function)
The I/O communication function executes the I/O data communication with each slave
node.
In the I/O communication function, the connection type can be set according to the
specification of the slave node.
There are four connection types: polling, bit strobe, change-of-state, and cyclic. The
connection type can be set with a parameter.
(1) When GX Configurator-DN is used
The following explains the I/O communication function when the GX
Configurator-DN is used.
PLC CPU QJ71DN91 Slave node
SET Y11 I/O communication
request
1)
3) Master function
receive
data area
0700H
07FFH
4) Master function
transmit
data area
0900H
09FFH
Transmission
Reception
5)
2)
X
Y
[I/O communication]
1) When the I/O communication request (Y11) is set, the I/O
communication with each slave node starts. It is not necessary to set
Y11, however, when the auto communication start is set with a
parameter.
[Reception data]
2) The input status from each slave node is automatically stored in the
"master function reception data" area of the buffer memory in the
QJ71DN91.
3) The input status stored in the "master function reception data" area of
the buffer memory is loaded onto the PLC CPU by the auto refresh
setting.
[Transmission data]
4) The ON/OFF information to be sent to the slave node is written into the
"master function transmission data" area of the buffer memory by the
auto refresh setting.
5) The ON/OFF information stored in the "master function transmission
data" area is automatically sent to a slave node.

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MELSEC-Q
3 SPECIFICATIONS
(2) When the sequence program is used
The following explains the I/O communication function when the sequence
program is used.
PLC CPU QJ71DN91 Slave node
SET Y11
X01
I/O communication
in progress
FROM
X01
I/O communicating
TO
I/O communication
request
1)
3) Master function
receive
data area
0700H
07FFH
4) Master function
transmit
data area
0900H
09FFH
Transmission
Reception
3)
2)
[I/O communication]
1) When the I/O communication request (Y11) is set, the I/O
communication with each slave node starts. It is not necessary to set
Y11, however, when the auto communication start is set with a
parameter.
[Reception data]
2) The input status from each slave node is automatically stored in the
"master function receive data" area of the buffer memory in the
QJ71DN91.
3) The input status stored in the "master function receive data" area of the
buffer memory is loaded onto the PLC CPU by the FROM instruction of
the sequence program.
[Transmission data]
4) The ON/OFF information to be sent to the slave node is written into the
"master function transmit data" area of the buffer memory by the TO
instruction of the sequence program.
5) The ON/OFF information stored in the "master function transmit data"
area is automatically sent to the slave node.