Inhibit alarms for a configured period of time

You can inhibit alarms for a number of days, hours, and/or minutes provided that the period of time does not exceed the global maximum duration inhibit time as configured by an Administrator.

Note: This procedure is not applicable to points where an Administrator has inhibited abnormal alarms.

In the following procedure, a status point is used as an example. The procedure is the same for multistate, rtstring, connection, and remote points. The Status Control dialog box is opened through either a station schematic or the Status Summary window. For information on the Status Summary window, refer to the AVEVA Enterprise SCADA HMI Controller documentation.

To inhibit alarms for a configured period of time

1. Open the Status Control dialog box.

   

2. Select Inhibit Alarms.

   The Alarm Inhibit dialog box opens.

   

3. Do the following:

   1. In the Inhibit Time field, replace the existing inhibit time with the desired number of days, hours, and/or minutes.

      Notes: The entry "00:00:00" inhibits alarms indefinitely.
      
      As mentioned above, the length of time cannot exceed the global maximum duration inhibit time as configured by an Administrator.

   2. (Optional) In the Expiry Warning Time field, replace the existing time with the desired number of days, hours, and/or minutes.

      Note: The Expiry Warning Time must be smaller than the Inhibit Time.

   3. (Optional) Describe the Reason for inhibiting alarms on the point.

   4. Select Submit Operator Inhibit.

      Note: This action inhibits both normal and abnormal alarms.

   The following occurs:

   • The Secondtimer starts counting down from the time indicated in the Inhibit Time field.

   • Any alarms that occur during the inhibit period do not appear in the Alarm Summary window.

   • If you entered a Reason for the alarm inhibit, the system creates a Control Room Management (CRM) note with the headline "Alarm Operator Inhibited". For further information, refer to the AVEVA Enterprise SCADA HMI Controller documentation.

   • The following occurs on the Alarm Inhibit dialog box for the point:

     • The Inhibit Time Left field updates every 15 seconds with the time remaining until the period of alarm inhibition ends.

     • Both the Inhibit Time field and Submit Operator Inhibit become unavailable.

     • The system selects the Operator Timed Inhibit checkbox.

       

   • The system selects the checkbox to the left of Inhibit Alarms on the point's Control dialog box to indicate that abnormal alarms are inhibited.

     

     If you specified an Expiry Warning Time, a system alarm appears in the Alarm Summary window at the configured time notifying you about the pending inhibit expiry.

     Note: System alarms are only visible in an easy eXtended Operator Station (ezXOS) configured for receiving system alarms.

     When the Secondtimer expires, the following occurs:

   • Any previously inhibited alarm now appears in the Alarm Summary window, provided the point has not since returned to a normal state.

   • The following message appears on the Alarm Summary window: "Manual override period expired".

   • The following occurs on the Alarm Inhibit dialog box for the point:

     • Both the Inhibit Time field and Submit Operator Inhibit become available.

     • The Inhibit Time Left field displays zero values for all units.

     • The time in the Inhibit Time field reverts to the default inhibit time as configured by an Administrator.

     • The system clears the Operator Timed Inhibit checkbox.

   • The system clears the checkbox to the left of Inhibit Alarms on the point's Control dialog box to indicate that abnormal alarms are no longer inhibited.

4. To stop inhibiting alarms when the inhibit is in effect, clear the Operator Timed Inhibit checkbox.

   The following occurs on the Alarm Inhibit dialog box for the point:

   • Both the Inhibit Time field and Submit Operator Inhibit become available.

   • The Inhibit Time Left field displays zero values for all units.

   • The time in the Inhibit Time field reverts to the default inhibit time as configured by an Administrator.

   • The system clears the Operator Timed Inhibit checkbox.

   In addition, the system clears the checkbox to the left of Inhibit Alarms on the point's Control dialog box to indicate that abnormal alarms are no longer inhibited.