(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)

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)

1

PREPARATORYFORPROCEDURESMONITORING 2

RANGESETBE

DEVICE CANTHAT 3

RANGEACCESS MONITORINGFOR 4

MONITORTOREDUNTANTSYSTEM HOW 5

CONNECTIONBUS 6

DIRECTTOCONNECTIONCPU 7

LINKCOMPUTER CONNECTION 8

ETHERNETCONNECTION

4. HOW TO MONITOR REDUNTANT SYSTEM

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4.4 CC-Link Connection (Via G4)