bc_fred Posted November 11, 2010 Report Share Posted November 11, 2010 Hi: I have a Vision 350 PLC and a Dell Latitude D520 laptop running the latest version of VisiLogic on XP Professional SP2. I have InTouch/Wonderware Version 9.0, and OPCLink 8.0. I'm using UniOPC, the latest version available from Unitronics, the website. I am communicating with the PLC via TCP/IP and I am able to download and program the PLC with no difficulty. My issues: I have used the InTouch/UniOPC configuration document that outlines how to set up OPCLink and InTouch to communicate. I have set my tag addressing both ways, one using a PLC Name of e.g. "PLC1" and a tag of "i.MI1" and the other way using an additional dot at the end of the PLC Name e.g. "PLC1." and NO dot in the middle of the PLC address for the tag, e.g. "iMI1". In both cases, I see evidence in UniOPC that part of the system works. I see the Event message "New Client Connected", and "Added New Item PLC1.iMI1". But, I don't get any value returned, (MI1 is actually the system clock seconds, (I'm using a Store Block to move SI 30 into MI 1) and is on display on the PLC screen, updating constantly). OPCLink reports that the Status is GOOD but that there are errors. The OPCLink I/O Data Monitor shows that the item is being accessed, but when double-click on the individual item, the status window says "data quality: UNCERTAIN", "substatus: No specific reason is known", and "limited: no". - What am I doing wrong/missing? I don't understand the difference between the Channels in Channel configuration i.e. TCP/IP Listen and TCP/IP Call except that I know that I can't have both with the same PLC name, so I have to pick one. I picked TCP/IP Call because I can specify the TCP/IP address of the PLC. - Should I be doing something else? - Do I have to explicitly name the PLC in my addressing for tags like "[PLC1].MI1"? - If I am running both UniOPC and OPCenum on a single computer, do I have to remove or disable OPCenum? Thanks for any and all help. I really want this system to be a success. Fred Mason Quote Link to comment Share on other sites More sharing options...
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