We have just installed our first Ignition server and are having trouble with tag values in OPC-DA connections. The COM client in Ignition can connect to our legacy OPC Server (DA vers. 2 compliant Think & Do). We can see the tags in the sever and can use the OPC Quick Client to read values from the tags. When we add an OPC tag in the designer, either by drag and drop or manually, we get null values. With the tag added in the designer, the OPC Quick Client fails to read the tag (Status: Bad_NodeIdUnknown). We can delete the tag from the designer and the OPC Quick Client reads the tag values fine. Our test bed system for Ignition does not have this problem.
The test bed system is as follows: Ignition vers. 7.07 running on XP SP2 connected to a remote PC running Think&Do OPC server (XP SP2).
Problem system is as follows: Ignition vers. 7.1.6 running on Windows Server 2008 SP1
No firewalls anywhere. DCOM configured with “everyone” and “anonymous” full access all four buttons on the COM security tab (both PCs). Thanks for any and all help.