Restarting redundant CL coupler
- Eliminate first the fault of the station last active.
In the case of an error, the fault of the station last active must be eliminated first, if necessary by replacing hardware.
The station last active is the station which has output a system error message (stations stop; redundancy switch-over) last.
Should both redundant network couplers fail, then only the station last active can be put into operation again, regardless of whether it was the master or the slave.
The same applies when both SL buses to the redundant network couplers have failed.