>>local RSLinxServer
>>RSLinxServer = CreateObject('RSLinxOPCAutomation.OPCServer')
>
>'Class definition RSLINXOPCAUTOMATION.OPCSERVER is not found.'

Some of COM objects uses not equal ProgIDs and class names. Try to find a similar class name in HKEY_CLASSES_ROOT of regisrty. It may be something like RSLinxOPCAutomationLib.OPCServer