Alarm Filters
By default, the OPC Alarm and Event collector will collect all alarm and event data sent to it, and archive it. This ensures that all your alarm and event data will be archived, without any special configuration. If you archive all of your alarm and event data, however, it can have an impact on the amount of storage required for Historian to operate. As a result, you may wish to specify which alarms and events you want the OPC Alarm and Event collector to collect. Alarm and Event filtering works on an inclusive model. If filtering is not enabled, all alarm and event data is collected. If filtering is enabled, then only the selected alarms and events are collected. The following filter options are available.
| Filter Option | Description |
|---|---|
| Severity Range | Includes alarms between a low and high filter range. For example, filter alarms whose severity range is between 100 and 200. |
| Event Type | Filters by event type. See Event Types, Categories, and Conditions for more information. |
| Area | Filters by a user-defined process area. This is useful if you only want to collect alarms from specific process areas. This filter option is only useful if you have defined areas in the alarm and event server. |
| Source | Filters by the alarm source. This is useful if you only want to collect alarms from specific parts of your process. |
| Category | Filters by event category. See Event Types, Categories, and Conditions for more information. |