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MELSEC-Q
7 APPLICATION FUNCTIONS
(d) The output of the remote I/O station is held while master operation is
switched from the multiplexed remote master station to the multiplexed
remote sub-master station.
Multiplexed remote master station
Multiplexed remote sub-master station
Remote I/O station
Remote I/O station Remote I/O station
Output is held during system switching.
(e) If the multiplexed remote master station returns to the normal status while
the multiplexed remote sub-master station controls remote I/O stations, the
multiplexed remote master station will perform sub-master operation as the
standby system.
Multiplexed remote master station
(standby system)
Multiplexed remote sub-master station
(control system)
Remote I/O station
Remote I/O station Remote I/O station
Master operationSub-master operation
7.11.2 Master operation by the station that has started up as the control system
The master module mounted in the station that has started up as the control system
performs master operation. The master module mounted in the standby system station
performs sub-master operation.
REMARKS
For the determination of the control system or standby system, refer to the
QnPRHCPU User's Manual (Redundant System).
Which of the multiplexed remote master station or multiplexed remote sub-master
station are controlling remote I/O stations can be checked from the MNG LED of each
station.
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
QJ71BR11
On: master operation (station controlling remote I/O stations)
Off: sub-master operation