<< Click to Display Table of Contents >>   Alarm Suppression

Alarm Suppression in Elipse E3 can be configured according to the options described next.

 

Suppression by Design

In suppression by design, which is defined in ANSI ISA 18.2 standard, when an Alarm changes from inactive to active, it is simply ignored, there is no visual indication nor a database record. For this change to be registered, configure the Alarm Source's SuppressedAsEvent property to True. In this case, an Event with the Fields Suppressed in True and SuppressedTime with the timestamp of the moment of change are stored on the database.

If an Alarm is active and the suppression condition changes from False to True, that Alarm leaves the active condition, keeping its initial values but with the Fields Suppressed in True and SuppressedTime with the timestamp of the moment of change. If the Alarm Source's SuppressedAsEvent property is set to True, the Alarm becomes an Event, that is, the EventType Field changes to "Event" and all other Fields keep their initial values, but with the Fields Suppressed in True and SuppressedTime with the timestamp of the moment of change. If the Alarm is active and the suppression condition changes from True to False, the Alarm is generated with the timestamp of the moment of change.

Alarms suppressed by design keep being counted on general counters. To change this behavior, configure the Alarm Source's ExcludeSuppressedOnAreaCounters property to True.

 

 

Suppression by Shelving

Suppression by shelving allows an operator to temporarily remove Alarms and Events from the current Summary. This allows an operator to manage visible Alarms or Events, silencing them while fixing a problem or focusing on more important Alarms or Events.

In their standard configuration, Alarm and Event shelving options are Shelve Alarms and Unshelve Alarms, available on E3Alarm's contextual menu. These options are not available if the AllowShelveAlarms property is configured to False.

Selecting the Shelve Alarms option displays the dialog box of the next figure.

The available options on this dialog box are described on the next table.

Available options on the Alarms dialog box

 

The Only the selected events option is only available if there are Alarms or Events selected on the E3Alarm. Users can shelve an Alarm or Event, and in this case a new record is inserted on the database indicating that shelving, and on the E3Alarm the corresponding row indicates that this Alarm or Event was shelved.

The All events of the current filter option is only available if there are visible Alarms or Events on the E3Alarm. Users can use this option without clicking any Alarm or Event. To do so, click any E3Alarm area to display the shelving window. By clicking this window, the shelving dialog box is displayed.

The All events in the system option is always available, even if there are no visible Alarms or Events on the E3Alarm.

Selecting the Unshelve Alarms option displays the dialog box on the next next figure.

For this option, the available items are the same ones of the Shelve Alarms option.