Master Operation By The Station That Has Started Up As The Control System - Mitsubishi Electric MELSEC Q Series Reference Manual

7 APPLICATION FUNCTIONS
Multiplexed remote master station
Sub-master operation

7.11.2 Master operation by the station that has started up as the control system

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(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.
Output is held during system switching.
Remote I/O station Remote I/O station Remote I/O station
(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)
Remote I/O station
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.
QJ71BR11
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
Multiplexed remote sub-master station
Multiplexed remote sub-master station
(control system)
Remote I/O station Remote I/O station
On: master operation (station controlling remote I/O stations)
Off: sub-master operation
MELSEC-Q
Master operation
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