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Alarms and events
display of alarm counts and alarm state icons on a custom display, information about an
alarm's suppression state takes precedence over information about its suppression state. See
the following scenario for more about the precedence of suppression over shelving.
The following scenario illustrates what happens when an alarm on POINTA01 has been
defined as a "target alarm" in the suppression group SG01, and that alarm is currently shelved
when suppression group SG01 is activated.
The alarm remains shelved until the shelving period expires (or until the alarm is manu-
n
ally unshelved).
On the Alarm Summary, the alarm:
n
Is included in both the (suppressed alarms) and (shelved alarms) view. If the
l
alarm is unshelved while the suppression group is still active, it is removed from the
(shelved alarms) view but stays in the (suppressed alarms) view until the sup-
pression group is deactivated.
Shows the Suppressed icon (rather than the Shelved icon) in the alarm icon
l
column.
Is included in the Suppressed count (but not the Shelved count) in the alarm stat-
l
istics at the bottom of the Alarm Summary.
On custom graphics:
n
If there is only one alarm condition currently existing on a point, and that condition
l
is both shelved and suppressed:
The point alarm state shows the Suppressed icon.
l
The alarm is included in the Suppressed alarms count (but not the Shelved alarms
l
count) on the point.
If there are two alarm conditions currently existing on a point, one shelved and one
l
suppressed, the point
alarm state shows the Shelved icon.
On the location pane of the Alarm Summary, the Tool Tip for the asset alarm count:
n
Does not show the Suppressed count or the Suppressed icon even if the only
l
nonzero alarm count is the Suppressed alarms count
Shows the Shelved count and the Shelved icon if a shelved alarm is the most import-
l
ant alarm on that asset.
Alarm prioritization
It is essential that alarms are correctly prioritized so that operators are able to respond to
alarms in a systematic manner. You therefore need to formulate a set of guidelines so that
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