Prerequisites
Verify the OPC Server
To verify the OPC Server, on the machine where the DeltaV OPC Server is running, open DeltaV Explorer.
From the Applications menu, open Diagnostics.
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On the left side expand DeltaV System, Control Network and then the name of the DeltaV node. Select OPC Subsystem.
On the right, ensure that OInteg (Overall Integrity) is set to Good.
Verify the Data Retrieval
To verify data retrieval, use DeltaV’s OPCWatchIt application. To run, from the Windows search box, enter opcwatchit.
Verify Server is set to OPC.DeltaV.1. If it is not, click Change Server to select it
Click BrowsePath, select a tag and click OK
Click Read to display real time value of the selected tag
If the OPC subsystem is not good or OPCWatchIt does not respond as described contact Emerson Automation Solutions technical support to troubleshoot and correct these issues.