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For input: The range of input of PLC and DCS mostly using a 4-20 mA. If we use a 5 mA there shall be deviation of reading of tranmitter in PLC or DCS.
For output also have problem since most of final control element such as control valve uses a 4-20 mA. If we use a 5mA, there will be a deviation of output due to this.
Indication in Control Room will be (1/16)*100%. For valve, depends by characteristics (linear, equal percentage, quick opening). Valve is moving from fail position (open or close).
