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AVEVA™ Operations Management Interface

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OPCClient object runtime behavior

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  • Last UpdatedJul 19, 2024
  • 1 minute read

The following information describes the runtime behavior of OPCClient objects. Run-time behavior is limited to the state of individual OPCClient objects.

After it has been deployed and is operating, an OPCClient object can assume one of several states, which are described in the following table:

State Change

Behavior

Startup

In this state, the OPCClient object connects to the OPC communications driver.

Going onscan

None.

Running onscan

In this state, the OPCClient object:

  • Services read and write requests.

  • Receives values from the OPC communications driver scan groups (device groups).

  • Monitors the connection to the OPC communications driver.

  • Detects alarm conditions, if alarming is enabled.

  • Monitors the data quality for OPC communications driver data values and updates run-time error statistics if the quality is not GOOD.

Going offscan

None. The ConnectionStatus attribute is set to "Disconnected."

Offscan

The object is passive and does not service read and write requests.

Shutdown

In this state, the OPCClient object disconnects from the OPC communications driver.

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