Each alarm is a single record in the system database that changes among one of four states.
When an event triggers an alarm, it remains in effect until it is acknowledged.
The alarm has been acknowledged by the recipient. Acknowledged alarms may be normal alarms.
Alarm is a normal alarm that has been acknowledged: acknowledged normal alarm
Alarm is cleared from the alarm console. The alarm state must be normal and acknowledged.
In addition to these states, an alarm may be open or cleared (closed). An alarm is considered open when it is not:
Open alarms display in the alarm console. Cleared alarms do not display in the alarm console. The table shows the conditions that result in an alarm being open or cleared.
| Alarm state | Acknowledge State | Open or cleared |
|---|---|---|
| Offnormal or Fault | Unacknowledged | Open |
| Offnormal or Fault | Acknowledged | Open |
| Normal | Unacknowledged | Open |
| Normal | Acknowledged | Cleared |