Routing Via A Redundant System - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

7 APPLICATION FUNCTIONS

7.10.8 Routing via a redundant system

7 - 159
This section describes the function of routing via a redundant system.
(1) Routing via a redundant system
To use the routing via a redundant system, set the network module mounted to
the control system CPU as a station to be routed.
Control system (system A)
Redundant Station
No. 1
CPU
When the control system is switched, the routing parameter must be changed to
go through the station of the new control system.
Change the routing parameter with the RTWRITE instruction.
For a sample program in the following system configuration example, refer to (2)
of this section.
Standby system (system A)
Redundant
CPU
Q25H Station
CPU No. 3
Network No. 2
Standby system (system B)
Station Redundant
No. 1
Q25H
Q25H Station
CPU No. 3
Network No. 2
A communication
error occurs.
Control system (system B)
Station Station
No. 1 No. 1
Network parameter settings
Destination Relay Relay
network No. network No. station No.
1 2
Station Station
No. 2 No. 2
CPU
Network No. 1
Station
CPU No. 3
Network parameter settings
Destination Relay
network No. network No.
1 2
Change this parameter
with the RTWRITE
instruction.
Redundant Station Station
CPU No. 2
Network No. 1
Q25H Station
CPU No. 3
MELSEC-Q
1
Relay
station No.
1 2
No. 2
7 - 159