The table below indicates how the alarm condition that triggers alarm suppression affects the entries in alarm displays, such as Alarms Lists and the Alarm Banner:
| Parent Alarm Object | Entry in Alarm Displays | Child Objects | Alarm Status | Entries in Alarm Displays |
|---|---|---|---|---|
|
No active alarms |
--- |
Any alarms |
Unacknowledged Uncleared/ |
VISIBLE |
|
Alarm that triggers alarm suppression raised |
VISIBLE |
Existing alarms that were raised pre-suppression |
Unacknowledged Uncleared/ Acknowledged Uncleared |
VISIBLE |
|
Alarms that cleared pre-suppression, which remain unacknowledged |
Unacknowledged Cleared |
VISIBLE |
||
|
Existing alarms, raised pre-suppression, which have been acknowledged while suppression is in force |
Acknowledged Uncleared |
VISIBLE |
||
|
Alarms raised while suppression is in force |
Unacknowledged Uncleared |
Suppressed (not shown) |
||
|
Alarms raised while suppression is in force and which have cleared while suppressed (ClearSCADA automatically acknowledges any alarms that are raised then clear while still suppressed) |
--- |
--- |
||
|
Alarm that triggers alarm suppression cleared |
VISIBLE (Unacknowledged Cleared)/ |
Any alarms, regardless of whether they were raised pre-, post-, or during suppression |
Unacknowledged Uncleared/ Acknowledged Uncleared/ Unacknowledged Cleared |
VISIBLE* |
|
Different type of alarm raised** |
VISIBLE |
Any alarms, regardless of whether they were raised before or while the parent object’s alarm is active |
Unacknowledged Uncleared/ Acknowledged Uncleared/ Unacknowledged Cleared |
VISIBLE |
* The date and time assigned to any alarms that were suppressed but become visible once suppression is no longer in force varies, depending whether the Use Visible Time As Alarm Active Time feature is enabled. If the feature is enabled, the alarm entries are time stamped with the date and time that they became visible post-suppression; if the feature is disabled (the default on most systems), the alarm entries retain their original time stamp (indicating the alarm’s original receipt time or occurrence time).
** Only some types of database item support more than one type of alarm.
Further Information
Alarm Status: see Alarm Status in the ClearSCADA Guide to Alarms.
Alarm Activity: see Activities that Occur when an Alarm is Raised in the ClearSCADA Guide to Alarms.
Use Visible Time as Alarm Active Time: see Define whether the Visible Time is used as the Active Alarm Time in the ClearSCADA Guide to Server Administration.