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Former Member
Sep 25, 2007 at 08:18 PM

OPC-DA connection



I am connecting to a Nematron OPC server (supporting OPC-DA v2.0), which is running WinNT SP6. On this server, I have installed the UDS Admin and OPC-DA UDS.

In the UDS Admin, I seem to have a successful connection (no port conflicts, the "light bulb" indicator is lit, message in Event Viewer says "Connected to datasource").

On the xMII server (Windows Server 2003 SP2, xMII 11.5.3b66), I have created an OPC Data Server which points to the IP address of the OPC server and the same port as configured in the UDS Admin (8085). The connection status appears to be successful (i.e. not red). There are no errors in the SAP log related to the connection.

However, when I create and run a Tag Query on this server, no tags are returned. I have verified that there are tags available on the OPC server using Canary TrendLink.

I have also tried running the OPC UDS as an application rather than as a service, but still could not retrieve any tags.

Any ideas as to why I cannot see any tags through xMII would be appreciated.