Monitoring the Status of DAS Conversations

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

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