The alarm LEDs on the CPM/CCM reflects the current status of the facility alarms:
The critical alarm LED is lit if there is 1 or more active critical facility alarms
Similarly with the Major and Minor alarm LEDs
The OT alarm LED is not controlled by the facility alarm module
The supported alarm severities are as follows:
Critical (with an associated LED on the CPM/CCM)
Major (with an associated LED on the CPM/CCM)
Minor (with an associated LED on the CPM/CCM)
Warning (no LED)
Facility alarms inherit their severity from the raising log event.
A raising log event for a facility alarm configured with a severity of indeterminate or cleared results in the facility alarm not being raised. But, a clearing log event is processed to clear facility alarms, regardless of the severity of the clearing log event.
Changing the severity of a raising log event only affects subsequent occurrences of that log event and facility alarms. Facility alarms that are already raised when their raising log event severity is changed maintain their original severity.