How can I connect LabView with a PLC S7-300?

I want to use LabView with a PLC S7-300. I think I can use a PC card or RS 232 with a HMI interface.What is the difference? I think I need an OPC server (I don´t know who sell it, National Instruments or Siemens) and I don´t know if I need anything else than LabView6i.
Thank you.

Alicia,
Ben's answer is absolutely correct. "Profibus" is the key word here, and a search of "profibus" from ni.com will provide quite a bit of information. I went ahead and pulled out the main items below. Follow the link below for product catalog info on the plug-in cards and interface software (the OPC Server) required.
http://sine.ni.com/apps/we/nioc.vp?lang=US&pc=bymn&cid=1315
For a step-by-step configuration tutorial, please follow this link:
http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&BA7CB7B0FFBEA12286256A32005B2BEA&cat=103057DD6D5AE678862568630016C98C
And finally, for examples on how to communicate with this OPC Server, or any other OPC Server for that matter, LabVIEW has some shipping examples. From LabVIEW, goto "Help >
> Communication >> Datasocket OPC". A good one here is the "Demo OPC Client" program, which uses a software OPC Demo Server that installs with LabVIEW. You could pull that open and work with the LabVIEW programming now before you even have the hardware.
Regards,
Greg Caesar
National Instruments,
Applications Engineer

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