Sudhi,
I assume finally you got the the National Instruments IA Server CD. If not, you might contact your N.I. sales representative.
Actually, the IA Servers (aka IAK Servers based on the configuration through NI Server Explorer) is not available anymore and is an obolete NI product. However, if you want to communicate with PLC and other 3rd party hardware, I would recommend to get an OPC server from the manufacturer of the hardware. Another option would be to get the Lookout Protocol Drivers from National Instruments which allows you to communicate through the OPC interface to different PLCs (P/N: 777616-01, Industrial Automation Servers with OPC Interface, Win NT/98/95,CD). Those drivers are included in the Control Edtion Packages for LabVIEW. Check it out: ht
tp://amp.ni.com/niwc/suite/control.jsp?node=10418
National Instruments has as well hardware with FREE drivers and OPC servers to make the communication between LabVIEW and the hardware very easy. E.g. the widley known distributed Fieldpoint devices and the well-known DAQ/SCXI systems will come with OPC servers.
Please check it out: www.ni.com/opc
Hope this helps
Roland