Mitsubishi Electric GOT2000 Series, Connection Manual

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4.2 MELSEC Q Series
4 - 67
4
HOW T
O
MONIT
O
R REDUNT
ANT SYSTEM
■3.
Monitoring target change when system switching occurs in a redundant system
(1) System switching due to an alarm occurred in the control system
When system switching occurs, the CC-Link switches the station No. 0 of the master station and the station No. 1 of
the standby master station on the network.
The CC-Link module of the new control system after system switching takes over the control as the master station.
Since the GOT monitors the master station, the monitoring target is automatically changed to the new control system
after system switching.
(2) System switching due to a network communication error occurred in other than the CC-Link of
the control system, or due to switching by the user
When system switching occurs, the CC-Link does not switch the station No. 0 of the master station and the station
No. 1 of the standby master station on the network.
The CC-Link module of the new control system after system switching takes over the control as the standby master
station.
Since the GOT monitors the master station, the monitoring target is not automatically changed to the new control
system after system switching.
To automatically change the monitoring target of the GOT to the new control system after system switching, switch
the data link control from the standby master station to the master station by the sequence program of the new
control system.
For details of the sequence program, refer to the following manual.
➠ QnPRHCPU User's Manual (Redundant System)
(Sample Programs when Using CC-Link)
POINT POINT POINT
CC-Link network setting
To automatically change the monitoring target in the QCPU redundant system when using the
CC-Link connection, set the CC-Link master station as System A and the standby master station
as System B.
For details of using the CC-Link network in the redundant system, refer to the following manual.
➠ CC-Link System Master/Local Module User's Manual
QnPRHCPU User's Manual (Redundant System)