Electrician Red Seal · Question
Which of the following is commonly used as a digital input to a PLC?
A photo-electric sensor typically provides a discrete ON/OFF signal, making it a digital input. Thermocouples and pressure transducers provide analog signals (v
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Question: Which of the following is commonly used as a digital input to a PLC?
Answer options: ✅ A photo-electric sensor detecting presence/absence of an object.
- A thermocouple measuring temperature.
- A pressure transducer outputting 4-20 mA.
- A potentiometer for speed control.
Correct answer: A photo-electric sensor detecting presence/absence of an object.
Explanation: A photo-electric sensor typically provides a discrete ON/OFF signal, making it a digital input. Thermocouples and pressure transducers provide analog signals (voltage or current), and a potentiometer outputs a variable resistance or voltage, also an analog signal.
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