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4. HOW TO MONITOR REDUNTANT SYSTEM
4.
HOW TO MONITOR REDUNTANT SYSTEM
This section explains the restrictions on the connection methods and other information applicable when the QCPU
redundant system is monitored by the GOT.
In a redundant system, the monitoring can be performed with the monitoring target specified as the control system or the
standby system on the GOT. By specifying the monitoring target PLC CPU as the control system of the redundant
system, the monitoring target is automatically changed to the PLC CPU in the control system when system switching
occurs.
To enable this automatic changing of the monitoring target at the GOT, settings are required in the GT Designer3.
4.9 Q Redundant Setting
Monitor
target
MELSECNET/H remote I/O network
CPU direct
connection
GOT
Station No. 0
(Multiplexed remote master station)
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Station No. 1
(Multiplexed remote sub master station)
Standby
system
(System B)
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Station No. 2
(remote I/O station)
Tracking cable
QJ72LP25-25
QJ71C24N
The GOT monitors
the control system
PLC CPU.
When an error occurs in System A, System B switches from standby system to control system.
Monitor target
MELSECNET/H remote I/O network
CPU direct
connection
GOT
Station No. 0
(Multiplexed remote master station)
Standby
system
(System A)
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Station No. 1
(Multiplexed remote sub master station)
Q25PRHCPU
QJ71LP21-25
QJ71BR11
QJ71E71-100
QJ61BT11N
Station No. 2
(remote I/O station)
Tracking cable
QJ72LP25-25
QJ71C24N
The GOT monitors the PLC CPU
of the new control system after
system switching.
Empty
Empty
Power supply
module
Power supply
module
Empty
Empty
Power supply
module
Power supply
module
Empty
Empty
Power supply
module
Empty
Empty
Power supply
module
Control
system
(System A)
Control
system
(System B)