Answer / abhijith

if process value is above than instrument range that is IOP
input open and if u remove 24v supply in transmitters it
shows IOP.

Answer / dass

IOP is an alarm condition where in the input data has become a bad value as a result of disconnection of a detection terminal or process I/O device or the abnormalities of input destination data .

Answer / nani

if process value in line is very high and loop power 24 v
failed to transmitter

Answer / ali imran fmb

If the Process value went to over range value due to any reason and frequently triggering alarm on the DCS or SCADA. To avoid this frequent alarm if the DCS or SCADA scanned off or shelving facility is locked, some technicians remove the 24v supply in transmitters then it will trigger alarm input open as well as it will show IOP on the face plate of the this tag number instead of normal. (NR)

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