Monitor the status of Communication Driver conversations

The InTouch WindowsViewer supports built-in topic names, DDEStatus and IOStatus, that can monitor the status of specific Communication Driver conversations.

For example, assume that WindowViewer (VIEW) is communicating with the SIDirect Communication Driver to a PLC. The PLC is defined in the InTouch application with the access name S7PLC. The discrete items, DDEStatus and IOStatus, are set to 0 when this Communication Driver conversation failed, and to 1 when this Communication Driver conversation is successful.