Alarms disappeared in 800xA for Advant (AC450)
We have a problem:
Alarms of any tags happen, after a few hours and then alarms disappeared at random.
Alarm Configuration is normal.
We had restarted Alarm Service and Connectivity Server, but alarms still disappeared.
We would like to know how to resolve this issue and try to do anything.
There are only a few reasons that could make an alarm to disappear:
1. RTN + ACK. Study event list to tell. Possibly add ack event on Alarm Manager special config for added trace.
2. Alarm overflow. Check [Workplace Structure]Web System Workplace:System Event list for "Alarm Manager soon full/is full" events to tell.
3. Sequential and/or parallel restart of Event Collector and Alarm Manager services. 800xA for Advant Master can not refresh alarm states at restart until version 6.0.
Reason 2 can often be easily abated by defining dedicated and significantlty smaller storage for frequently occuring system alarms.
The risk for nr 2 to happen significantlty increases by enabling the much less desired "Make new alarm each time a condition gets active". Better leave this option OFF.