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How do I interface LabVIEW v6.1 (PC+Windows) with a Siemens S7-400 PLC running PCS7

My LabVIEW app is running on a PC with just an Ethernet interface. The PLC has both Ethernet, MPI and Profibus interfaces, but I would prefer to use the ethernet interface with an open protcol such as OPC.
Has anyone implemented such a link (or similar), and if so any pointers would be really appreciated.
Thanks
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You can exchange data between PLC and Labview by means of Siemens OPC Server.
This server communicate with PLC automatically.
You can easily connect Labview to this OPC using DataSocked:(see link)

http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/df8c0a4ba2e2b22a86256a3700592bea?OpenDocument

I'd checked it. It works very well. But I have used Siemens PC Profibus card to connect with PLC.
I think it should works well with Ethernet, but there may be one problem - you have to get Siemens Ethernet card for PC.
If any questions, don't hesitate to contact.
Romek.
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