Wiring Precautions - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Wiring precautions

For a configuration including a star topology
• When disconnection occurs between the control system of the redundant system and the switching hub, communications
can be continued by system switching. However, if disconnection occurs between the switching hub and the system
switching monitoring target station, because communications with the system switching monitoring target station cannot be
continued, a communication error occurs in the standby system and system switching does not occur.
Control system
• When a star topology is configured in a redundant line configuration, the control system network and the standby system
network cannot be connected to the same switching hub.
For a configuration including a line topology
Connect both systems in the redundant system so that they are at both ends. When the control system in the redundant
system is connected in the middle, if a communication error occurs in the control system and the system switching monitoring
target station (1), the new standby system station after system switching and the stations positioned after the new standby
system station will be disconnected.
Control system
(1)
1.7 Redundant System Function
1
1 FUNCTIONS
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