An OPC client cannot directly communicate with ABB-PLC. For that you
must have an OPC server for ABB-PLC. Check this link
http://www.matrikonopc.com/products/opc-drivers/index.asp . This
includes a list of differnt OPC server for various PLC.
For getting data from OPC Server in VB, you have different options:
# You can directly use VB automation wrapper supplied by OPC foundation
(free) or check for DA automation wrapper at this link
http://www.nordyn.com/Downloads/Downloads.htm#DA Automation Wrapper
. You should have some knowlege of OPC Standard.
# You use any OPC client Active X. Free as well as commerical solutions
are available. Check this link http://opcconnect.com/source.php .
For VC it is also same, you can use third party library.
The most important is getting OPC server for ABB-PLC, and not the
client. A OPC client will talk to any OPC server.
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