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AVEVA™ Operations Management Interface

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Runtime behavior of the DDESuiteLinkClient object

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  • Last UpdatedJul 19, 2024
  • 1 minute read

The following information describes the runtime behavior of DDESuiteLinkClient objects. Runtime behavior is limited to the state of individual DDESuiteLinkClient objects.

After it has been deployed and is operating, a DDESuiteLinkClient object can assume one of several states, which are described in the following table.

State Change

Behavior

Startup

In this state, the DDESuiteLinkClient object connects to the I/O Server.

Going onscan

None.

Running onscan

In this state, the DDESuiteLinkClient object:

  • Starts the AVEVA NetDDE Helper service, if the selected communication protocol is DDE.

  • Services read and write requests for tag values in the target I/O Server.

  • Receives values from the I/O Server.

  • Sends values to the I/O Server.

  • Receives values from the I/O Server topics.

  • Monitors and controls the connection to the I/O Server.

  • Detects alarm conditions, if alarming is enabled.

  • Monitors the data quality for I/O Server data values and updates runtime error statistics if the quality is not GOOD.

Going offscan

None.

Offscan

In this state, the object is passive, and reads and writes to the I/O Server are not enabled.

Shutdown

In this state, the DDESuiteLinkClient object:

  • Disconnects from the I/O Server.

  • Releases the security for the DDE user, if used.

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