Hello Forum,

one of our customers want's to connect an IOT2050 to some older Sinumerik 840D sl systems, to be able to access 'Sinumerik PLC and NC Variables via OPC UA. The customer is using the older Sinumerik Solution Line Firmware versions 2.6 SP1 HF5 and 2.7 SP3 HF4. 

Does anybody know if this ist possible?

If yes, where can we find examples of how to set up the IOT2050 with the Sinumerik Systems. How for example does the access to the NC Variables work? Do we need to create symbolic files with the NC Varselector?

We have already checked alternative Solutions from for example Softing (uaGate 840D) and IBH Link (IBH Link UA) which both should work fine with the 2.7 Firmware Version of Sinumerik. But something seems to be problematic with the 2.6 Firmware version, as this is excluded in the tecnical documentations.

Thanks in advance for any kind of help

Martijn

Hello Bergmanu, thanks for your answer.

The OPC UA Server was integrated into the Sinumerik Solution Line Firmware Version 4.5. This means, that the older Versions (Solution Line < 4.5 and the so called Power Line Series) do not have an onboard OPC UA Server. 

The Sinumerik Solution Line always exists of two parts, an integrated S7-300 and the NC Kernal. The integrated S7-300 can access NC Variables by calling Siemens Function Blocks with the memory adresses of the NC Variables. These memory adresses are created by a program called NC Varselector. 

I guess, that the other competitors use S7 communication to access the integrated plc and its variables and somehow use the Siemens Function Blocks with the memory adresses to also access the NC variables.

Can the IOT2050 use S7 communication to fetch data from for example an S7-300? Or does it always need an OPC UA Server in the S7?

Best regards

Martijn