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4. HOW TO MONITOR REDUNTANT SYSTEM
4.2 Direct CPU Connection
4.2.2 When using two GOTs
Connect a GOT to each PLC CPU to respond to the system switching.
(1) Connection method
Connect GOTs to the RS-232 interface of the control system and standby system CPU modules (Q12PRHCPU,
Q25PRHCPU) of the redundant system.
For details, refer to the following.
6. DIRECT CONNECTION TO CPU
(2) GT Designer3 setting
Set GT Designer3 as follows.
(3) Monitoring target change when system switching occurs in a redundant system
When the system switching occurs, the GOT cannot change the monitor target automatically in response to the
system switching.
The GOT that is connected to the control system CPU module after system switching continues the monitoring.
Different from the case using one GOT, no cable reconnection is required.
POINTPOINTPOINT
To automatically change the monitoring target after system switching using one GOT, make the Q redundant
settings.
4.9 Q Redundant Setting
Setting item Settings Model
Controller Type
MELSEC-QnA/Q/QS, MELDAS C6*
MELSEC-QnA/Q, MELDAS C6*
Device setting
(Network setting)
Host Host
Q Redundant Setting Do not set the item.
Monitor
target
Network No. 1, Station No. 0
(Multiplexed remote master station)
Network No. 1, Station No. 1
(Multiplexed remote sub master station)
Network No. 1, Station No. 2
(remote I/O station)
Power supply
module
Power supply
module
Power supply
module
MELSECNET/H remote I/O network
CPU direct connection
GOT1
Control system
(System A)
Empty
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Standby system
(System B)
QJ72LP25-25
QJ71C24N
Empty
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Empty
Empty
CPU direct connection
GOT2