In split range control, whether the signal is splitted through I/P convertor or the convertor itself?

PLC
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This can be typically achieved by two ways:

By connecting o/p of one I/P converter to two positioners adjusted suitably for split range operation of control valves.

Taking two AO from DCS/PLC.

Split range to be defined in DCS.

Both I/P converters and positioners to be calibrated with input as 4to20 ma dc and 3to15 psi respectively.

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Also Read about Split Range Control Loop

check below link

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