Instrumentation Specialist Question:
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Explain what are Analog Input/output & Digital Input/output?
Answer:
4-20 mA signals from instrument (transmitters) are analog input to control system.
4-20 mA signals to instrument (I/p & electro pneumatic positioner) are analog output from control system.
Volt free (24V) contact (NO/NC) by instruments (all type of switches, ex. Limit switch, press,temp,flow,level switch) are digital input to control system.
All powered signals (24V,48V,110V….) from system to instruments (SOV) are Digital outputs.
4-20 mA signals to instrument (I/p & electro pneumatic positioner) are analog output from control system.
Volt free (24V) contact (NO/NC) by instruments (all type of switches, ex. Limit switch, press,temp,flow,level switch) are digital input to control system.
All powered signals (24V,48V,110V….) from system to instruments (SOV) are Digital outputs.
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