Monitor the status of Communication Driver conversations

The InTouch WindowViewer supports built-in topic names, called DDEStatus and IOStatus, that can be used to monitor the status of specific Communication Driver conversations. For example, let us assume that WindowViewer (VIEW) is communicating with the ABTCP Communication Driver to a PLC that has been defined in the Communication Driver with the topic name ABPLC.

The discrete items, DDEStatus and IOStatus, are set to 0 (zero) when this Communication Driver conversation failed, and to 1 (one) when this Communication Driver conversation is successful.