OPCDA failuar Error found
Please submit more information.
If this would concern System 800xA; there is a supervision on every OPC DA server connected to the system. Every 5 second the system is checking that "OPC_STATUS_RUNNING" is returned; or else you may get an alarm in the System Alarm List.
Check the health of the OPC DA server; e.g. using the built-in advdsopcclient.exe which displays the server status.
Example of diagnostic events in System 800xA when a redundant OPC DA server pair crashes or stops unexpectedly.