Mitsubishi Electric GT1685 Connection Manual page 136

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.
Control
system
(System A)
Tracking cable
When an error occurs in System A, System B switches from standby system to control system.
Standby
system
(System A)
Tracking cable
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 - 2
4. HOW TO MONITOR REDUNTANT SYSTEM
Monitor
target
Station No. 0
(Multiplexed remote master station)
MELSECNET/H remote I/O network
Station No. 2
(remote I/O station)
Station No. 0
(Multiplexed remote master station)
MELSECNET/H remote I/O network
Station No. 2
(remote I/O station)
4.9 Q Redundant Setting
Station No. 1
(Multiplexed remote sub master station)
GOT
CPU direct
connection
Monitor target
GOT
CPU direct
connection
Standby
system
(System B)
The GOT monitors
the control system
PLC CPU.
Station No. 1
(Multiplexed remote sub master station)
(System B)
The GOT monitors the PLC CPU
of the new control system after
system switching.
Control
system