Table of Contents
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1 OVERVIEW
QJ71DN91 master
(node No.1)
Master function
1 - 3
(3) Operating as a DeviceNet master/slave node
The QJ71DN91can operate as a master and slave node concurrently.
I/O communication
DeviceNet slave
(node No.2)
I/O
communication
DeviceNet slave
(node No.3)
I/O
communication
(4) Preventing inconsistency of I/O data
When I/O data is read from/written to the buffer memory of the QJ71DN91, data
inconsistency can be avoided using Data consistency dedicated instruction
(DNTMRD, DNTMWR, DNTSRD, DNTSWR). (Refer to Chapter 9.)
(5) Easy setting using GX Works2
The number of sequence programs can be reduced since settings of the
QJ71DN91 can be configured on GX Works2.
Also, GX Works2 simplifies checking of the module settings and operation status.
QJ71DN91 master/slave
(node No.4)
Master function
Slave function
24V power
supply
I/O
communication
I/O
communication
No communication between
DeviceNet slaves
MELSEC-Q
DeviceNet slave
(node No.5)
DeviceNet slave
(node No.6)
1 - 3
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Table of Contents
Troubleshooting
