Mitsubishi Electric QJ71DN91 User Manual page 19

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 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.
QJ71DN91 master/slave
(node No.4)
Slave function Master 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