Should SynchLink betwen SM811 be connected?
In a redundant PM865 HI configuration I have a hardware warning on the redundant SM811 modules as the SynchLink is disconnected.
I needed to synchronize the two but disconnected the cable afterwards. SM811 is still showing synched state (SYNCH LED is lit) but I have the following IO status for the SM811:
Internal warning Unit B, Internal warning Unit A
Unit A RUNNING, Unit B RUNNING, SynchLink Down, Redundant mode enabled
My question is, should the SynchLink be connected at all times or is it only used in certain cases such as after firmware upgrade?
By the way, controllers are running in dual mode.