Local alarm display in the Object Viewer

The Object Viewer shows thirteen values, separated by commas, for the AlarmCntsBySeverity attribute. The first twelve values (logically divided into groups of four) show how many alarms of each severity and type have been aggregated for the selected object or area:

1. Number of active alarms, by severity.

2. Number of unacknowledged active alarms, by severity.

3. Number of unacknowledged alarms that have returned to normal, by severity.

4. Bit value that shows which alarm severity and status applies to the local object.

   This value is a sum of the bit values shown in the following table:

   	ß (LSB) Active (1)				UnAck_ALM (2)				UnAck_RTN (3) (MSB) à
   	S1	S2	S3	S4	S1	S2	S3	S4	S1	S2	S3	S4
   Bit value	1	2	4	8	16	32	64	128	256	512	1024	2048

In the Object Viewer example shown above, the local object bit value (4) is 34. This is the sum of the active S2 bit value plus the UnAck_ALM S2 bit value. Other examples:

• If the local object has one or more active S1 alarms that are unacknowledged, the bit value is 17 (S1 Active Alarm = 1; S1 UnAck_ALM = 16).

• If the local object has one or more active S4 alarms that are UnAck_RTN, the bit value is 2056 (S4 Active Alarm = 8; S4 UnAck_RTN = 2048).

• If there are no local alarms, the bit value is 0.

• If there are multiple local alarms with different severities and unack statuses, the bit value is the sum of each bit that is set. For example, if there are two unacknowledged S1 alarms, but one has returned to normal, the bit value is 273 (two S1 Active Alarms = 1; one S1 UnAck_ALM = 16; one S1 UnAck_RTN = 256). Note that each bit that is set is only counted once, even if more than one alarm exists at that severity or status.

• Severity 5 alarms, if configured, are not captured by the AlrmCntsBySeverity attribute or the Object Viewer.

When alarm aggregation is shown on a navigation item in an AVEVA OMI ViewApp, the bit value is used by the navigation item to determine the alarm location (selected object or a contained object). See Aggregated alarm display in OMI ViewApp navigation for additional information.

Note: By default, AlarmCntsBySeverity includes shelved and silenced alarms, but does not include hidden or disabled alarms. You can change this by changing the AggregatedAlarmStatesIncluded filter. For more information, see AggregatedAlarmStatesIncluded attribute.