Hi,
Once you have an OPC server you will be able to use Labview to write and read from this OPC server using the Datasocket VI's or even the Datasocket Front Panel connection, the protocol you are using on the other side(in your case teh eib-bus) will be completely transparent to the Labview program.
Have as a reference to first start with the Datasocket and OPC connection the following document:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/df8c0a4ba2e2b22a86256a3700592bea?OpenDocument
Actually when you use datasocket to connect to OPC there is no special recommendation to make the program to work, Labview will treat the OPC server as a space where it can read from and write to, just as it does when you use the data
socket server instead.
I hope it helps
Best Regards
Andre Oliveira
Applications Engineer
National Instruments