CI855 Communication Stops without any Error Status.
I am having a redundant CI855 with PM891 Controller.
As you can see in attached screenshot Primary CI855 is not communicating without any error status.
Can anybody help me regarding the issue.
Thanks in Advance.
I´m facing similar problem, but it is intermittent.
I have found a product bulletin saying that
After four (4) bus errors and following restarts the module will be kept permanently disabled until power is cycled (or hot remove and hot insert). No communication will be possible (application will sense permanent loss of connection).
So, check for message "watchdog BUS_ERROR" on controller´s log, this problem may appear with units manufactured from approximately 2012 and later, for PR:F. Check the Produc Revision and contact your ABB local support.