Define the Grace Period for Feedback Sent in Response to Control Checks

When supported and enabled for use on a Point or Pulse Action, the Control Checks feature provides two capabilities:.

• It waits for feedback once a control on that Point or Pulse Action starts. It raises an alarm if the feedback does not occur.

• It raises an alarm if feedback occurs unexpectedly (that is, without a control having been started).

To allow for clock drift, you can specify a 'grace period'. With the first bullet point above, Geo SCADA Expert applies this 'grace period' to the period during which feedback is expected. With the second bullet point above, Geo SCADA Expert applies the 'grace period' to the period within which feedback is allowed. This helps to ensure that alarms are not raised unnecessarily if the outstation clock (and therefore, the time that the outstation reports for value changes) differs by a small amount from the time at the Geo SCADA Expert server.

To define the grace period:

1. Access the Geo SCADA Expert Server Configuration Tool.

2. Expand the Global Parameters branch of the tree-structure.

3. Select the Drivers entry.
   The Drivers section is displayed.

4. Specify the required grace period in the Control feedback grace period field. The default is 1000 milliseconds.

   

5. Apply the changes to the server.

6. Restart the required driver(s) so that the new grace period takes effect (main server only). For more information, see Start and Stop a Driver.

7. Repeat steps 2-6 inclusive for the other servers in the system, except permanent standby servers.