Unlike with some other drivers, a device discover job is not network-wide—each time you must enter the IP address or hostname of the target OPC server (Figure 3), which defaults to “localhost.” If you have multiple OPC server hosts, you will need to run that many Opc Device Discover jobs.
Additional usage notes about the Opc Device Manager include:
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Offline engineering is possible (using New), but is not typically used.
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Typically you do not change any defaults in the Add dialog (Figure 4) when adding an OpcDaClient, unless the OPC server does not have OPCEnum installed. In this case, you must enter the Class Id (CLSID) of the server, and possibly other Config properties in the OpcDaClient’s property sheet.