Mitsubishi Electric MELSEC iQ-R Series User Manual page 52

■When the system starts by simultaneously resetting the remote head modules of both
systems or by performing remote reset operation
The entire system is reset.
After reset clear, the control system and standby system are determined by tracking the master station.
Remote reset operation can be performed only on the remote head module of the control system.
■When the system starts after the remote head module of the standby system is replaced
The replaced remote head module will be the standby system by tracking the system status of the master station.
Replacement of the remote head module can be performed only on the remote head module of the standby
system.
For the replacement procedure, refer to the following.
Page 100 For the standby system in a redundant system configuration
1 FUNCTIONS
50
1.8 Redundant Function