What Happens When A Shelved Alarm Is Suppressed - Honeywell Experion LX Client Manual

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Alarms and events
Dealing with stale or standing alarms such as those arising from instrument malfunction
n
or faulty equipment awaiting repair.
Background or nuisance alarms such as those arising from unusual weather conditions.
n
Dealing with alarms that require action that may take time. For example, an operator
n
may need to change a temperature set point for a process that takes two hours to effect
the change. In a case like this, operators can shelve the alarm for two hours, knowing
that if the alarm is re-annunciated after that time, there is still a problem that needs to be
addressed.
Operators can shelve alerts as well as alarms. The following information about alarm shelving
also applies to alerts.
How alarm and alert shelving works
When an alarm is shelved, Experion automatically:
n
Acknowledges the alarm
l
Silences the alarm
l
While alarms are shelved they can be viewed by using the (shelved alarms) view on
n
the Alarm Summary or by choosing one of the filters on the Alarm Icon column that
show shelved or hidden alarms.
Depending on how shelving has been configured at a given site, shelved alarms
n
generally do not reappear in the Alarm Summary until their shelving period expires or
they are manually unshelved.
If an alarm returns to normal while it is shelved, it remains shelved until its shelving
n
period elapses or it is unshelved by the operator. When such an alarm is unshelved it
automatically disappears from the alarm summary.
If an alarm recurs while it is shelved, the alarm remains shelved and also remains
n
acknowledged and silenced.
For more information about alarm shelving, see the "Configuring alarm shelving" topic in the
"Configuring alarms, alerts, and messages" section of the Station Configuration Guide.

What happens when a shelved alarm is suppressed?

If an alarm is either shelved or suppressed, it is hidden from the default view of the Alarm
Summary. Note thatshelved alarm messages are still shown on the Message Summary.
Information about the shelved state of an alarm is maintained independently of information
about the suppression state of an alarm. However, where an alarm is both shelved and
suppressed, information about the suppression state of an alarm is considered to be more
important (or of greater interest) than information about its shelving state. For example, in the
Honeywell 2017
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