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4. HOW TO MONITOR REDUNTANT SYSTEM
4.4 CC-Link Connection (Via G4)
4 - 21
1
PREPARATORY
PROCEDURES FOR
MONITORING
2
DEVICE RANGE
THAT CAN BE SET
3
ACCESS RANGE
FOR MONITORING
4
HOW TO MONITOR
REDUNTANT
SYSTEM
5
BUS CONNECTION
6
DIRECT
CONNECTION TO
CPU
7
COMPUTER LINK
CONNECTION
8
ETHERNET
CONNECTION
(3) Monitoring target change when system switching occurs in a redundant system
(a) 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.
(b) 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)
POINTPOINTPOINT
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)