Mitsubishi Electric MELSEC-Q Series - Page 244

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(e) When a transmission passes through a redundant system
1. Set a control system station as a relay station.
2. If a system switching has occurred, change the relay station setting to a new control system
station.
Use the RTWRITE instruction to change routing parameters.
For details on the RTWRITE instruction, refer to the following.
Programming Manual (Common Instructions) for the CPU module used.
Ex.
Program example of the RTWRITE instruction
112 1 1 22
Routing parameter 1. Routing parameter 2.
Station No.3
Station
No.3
Station
No.3
Target
Network No.
Relay
Network No.
Relay
Station No.
Station No.1
Control system
Station No.2
Standby system
Station
No.1
Station
No.2
Network No.2
Network No.1
Network No.2
Changed by RTWRITE
instruction.
Target
Network No.
Relay
Network No.
Relay
Station No.
Station No.3
Station No.1
Standby system
Station No.2
Control system
Station
No.1
Station
No.2
Network No.1
Communication
error
Passing through station No.2 of network No.2
Passing through station No.1 of network No.2
Relay station network No.2
Relay station network No.2
Relay station No.2
Relay station No.1
Setting a dummy
Target network No.1
Setting a dummy
Target network No.1