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PLC, External connection, OPC

Hi, does anybody know how to address datablocks (e.g. DB1.DBX0.0) in the Signal mapping tool? I'm using OPC connection in PS 12.1.

 

Dave

 

5 REPLIES

Re: PLC, External connection, OPC

hello,

 

normaly PS connected only to input and outputs from plc.

 

In reality you have no connection via DB to devices. All signals connect via I/Q.

 

One way: you connect PS to OPC Server and merge the signals in OPC Server to DataBlock Adress.

The OPC can connect to PLC to correct DB

Kind regards,

Benjamin Voelzke

Re: PLC, External connection, OPC

Thank you very much for your answer. You confirmed my opinion. We have solved it by remapping data blocks to inputs and outputs in a PLC. Luckily it was possible in this project.

 

However, it could be a good enhancement request, because data blocks are commonly addressed via OPC communication directly.

 

Dave

Solution
Solution
Accepted by topic author Dave007
‎08-27-2015 11:42 AM

Re: PLC, External connection, OPC

I am not sure that's what Voelzke tried to tell you.
Your OPC should support DB's.
Then you should be able to access it like e.g.
Signal name= DB123.xyz

Re: PLC, External connection, OPC

Thank you, for your answer. I'll check it.

 

Dave

Re: PLC, External connection, OPC

Just FYI: It works.

 

The only limitation is that we had to set Signal by Name Mapping. However, everything works fine and it's very easy to set the signal names same as in the OPC server.

 

Thank you for help

 

Dave