Loss of connectivity between PI Interface for OPC HDA and the OPC HDA server

If communication between the interface and the OPC HDA server is lost, the interface will periodically try to reestablish the connection. All the historical data for when the connection was down will be recovered after communication is re-established and then data collection will resume.

If communication between the interface and the Data Archive is lost, the interface will still collect data and periodically attempt to re-establish communication.

If PI API Buffering is enabled, no data is lost.

If buffering is not enabled data is lost.