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What is an analog input-output
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Answer Posted / yousuf
In instrumentation the analog refers to the(4-20ma).
when the analog signal(4-20ma) goes to the input module in
the control system that is called analog input.
eg. the output of pressure transmitter
when the analog signal(4-20ma) comes from the output module
to the final control element in the field ie called analog
output.
eg. control valve
the digital signal in the instrumentation system varies
according to the application for eg we can take two states
on and off for off state the signal is 0v and the on state
the voltage 24v
digital inputs means the signal goes to the digital module
for eg the signal of pressure ,flow ,temperature switch.
digital output means the signal comes from the digital
output module for eg the signal to solenoid valve in the
esd valves
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