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MELSEC-Q
1 OVERVIEW
(3) Operating as a DeviceNet master/slave node
The QJ71DN91can operate as a master and slave node concurrently.
24V power
supply
QJ71DN91 master
(node No.1)
DeviceNet slave
(node No.2)
QJ71DN91 master/slave
(node No.4)
DeviceNet slave
(node No.3)
DeviceNet slave
(node No.5)
DeviceNet slave
(node No.6)
Master function
Master function
No communication between
DeviceNet slaves
I/O communication
Slave function
I/O
communication
I/O
communication
I/O
communication
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 Configurator-DN
The number of sequence programs can be reduced since settings of the
QJ71DN91 can be configured by GX Configurator-DN (sold separately).
Also, GX Configurator-DN simplifies checking of the module settings and
operation status.
Summary of Contents for QJ71DN91
Page 1: ...DeviceNet Master Slave Module User s Manual QJ71DN91 GX Configurator DN SW1D5C QDNU E ...
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