Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 139)

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 139
Configure the Redundancy Modules Chapter 6
Monitoring and Repair
Synchronization is preserved if the REDUNDANT channel has failed or is being
repaired. The repair of the REDUNDANT channel can be performed online
while the redundant chassis pair is running synchronized. To aid online repairs,
the fiber cable connections and SFP transceiver can be removed and inserted
under power.
It is not mandatory to have the REDUNDANT channel connected between the
two redundancy modules. The redundant chassis pair can be synchronized with
just one of the channels connected. The REDUNDANT channel can be
installed later while the chassis is running synchronized.
The status indicators on the front panel and the indicators and counters
displayed in the RMCT provide monitoring of the channel status.