Its possible with 37/57 processors and older Protool/WinCC Flex hardware.
I think the driver has been dropped for WinCC V11.
Unfortunately its not a simple comm's cable setup - so You will need TSXSCA62 & TSXPACC01 boxes for protocol conversion.
It worked fine but in all honesty i wouldn't do it again - id just fit a Redlion G3 for the simplicity or Magelis etc.
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