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I wish to know if a TUV approved ESD system allows to split the processor and I/O to two different physical locations.

I mean PLC processor in Central control room and I/Os in the field remote I/O room. (Though I feel TUV won't approve splitting)

Regards,
Mathiyazhagan
Technip India Limited
0091-44-2230 3361

There are Safety ESD systems that allow for remote IO.

The remote IO bus is a TUV approved feature. I have seen this used in the oil refining industry where ESD IO is required on a tanker loading jetty and the processor is back in the main switch room.

I believe the Quadlog (Siemens) and ProSafe PLC and ProSafeRS (Yokogawa) do this. Also the Emerson SLS (smart logic solver) would achieve this as each SLS has 16 IO and a processor and can be on remote racks.