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Direct Digital Controls And Lab Practice Test

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What type of signal does an analog input provide to the controller?
Correct Answer:
A digital data stream.
Explanation:
An analog input provides a continuous, proportional electrical signal to the controller. This means the input presents a voltage (for example 0–10 V or 0–5 V) or a current (like 4–20 mA) that varies smoothly with the measured quantity, allowing the controller to read precise, intermediate values for accurate control. A digital data stream carries discrete bits of information, not a continuous measurement, so it isn’t the direct form of an analog input. PWM is a way to approximate an analog level by switching on and off with varying duty cycle; the actual analog input, however, is a steady, varying voltage or current, not a pulsed signal.

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