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Why Ma signal is using for control system?
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Answer Posted / vikram budhiraja
A process variable can be transmitted (as an analog signal) over a pair of wires either as a voltage or a current.
A current (milliamp) analog signal is preferred in control systems over voltage because the current in a loop cannot be different at the generating end and the receiving end regardless of the length of the wire carrying the signal.
On the other hand a voltage signal suffers a drop ( IR loss) depending on the length of the wires carrying the signal resulting in error.
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