Alarm & Event Error
Voted best answer
Further to skhpatnaik's most valuable input I would like to just mention the Alarm Conditions feature of CBM.
When online with application, right click any object known to have an alarm and select Alarm Conditions and view their "State".
Status / Description (which depend a bit on the choice of Acknowledgement Rule, AckRule=1 is shown below):
0 = AlarmCond module not activated in PLC code, or activated with a bad parameter, e.g. too long or not unique SrcName,Condition pair
1 = disabled
2 = inactive, acknowledged, enabled (Idle state)
3 = inactive, unacknowledged, enabled
4 = active, acknowledged, enabled
5 = active, unacknowledged, enabled
6 = autodisabled, unacknowledged, enabled