Associated with: WITS Database Points
Security permission required to access this pick action: Disable Alarms
You can use Inhibit Alarms/Events to restrict the Field Device so that it does not report DNP3 events and/or logging events for a point. However, an inhibit does not prevent the periodic logging of values for the point or the reporting of its current statuses or current values. Inhibits are useful when you know that a point is going to generate unnecessary events, for example, if a measuring instrument has developed a fault.
NOTE: An inhibit on an individual point is separate to an inhibit on all points (inhibit applied the WITS Outstation). For example, you could inhibit an individual point and then inhibit the WITS Outstation (with which the point is associated). If you then remove the inhibit on the WITS Outstation, the individual point will remain inhibited.
When you select Inhibit Alarms/Events, you can choose from:
- Inhibit Alarms, Events and Logged Events—Stops the Field Device from reporting any changes for the point.
- Inhibit Alarms and Events—The Field Device logs events for the point instead of generating DNP3 point events, and so does not initiate a connection. As the events are logged, ClearSCADA will only present these alarms and events after a logged data retrieval (see WITS Data Logging).
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Inhibit Alarms—The Field Device logs events and generates DNP3 point events for the point, but will not initiate a connection to report DNP3 events. Any DNP3 events for the point are added to the Field Device's event queue and retrieved by ClearSCADA when the next connection occurs.
If your Field Device has a permanent connection to ClearSCADA, selecting Inhibit Alarms will have no effect.
- Uninhibit—Removes the current alarm and event inhibit for the point. As a result, the Field Device returns to logging events and generating DNP3 events for the point as configured (see Severity Types and Actions for WITS Database Points).
If supported by your Field Device, you can also define a Timeout for the inhibit. The Timeout is an OPC time interval, in seconds (see OPC Time Format in the ClearSCADA Guide to Core Configuration). If you enter 0, no Timeout is used. If you specify a Timeout, the inhibit will remain in place until:
- the Timeout expires
- a new inhibit is applied
- the inhibit is removed (by using the Uninhibit action).
If a Timeout is not used (or not supported) the inhibit applies until:
- a new inhibit is applied
- the inhibit is removed (by using the Uninhibit action).
NOTE: The View Status window for the Point shows the current inhibit status.
Further Information