Electrician Red Seal · Question
An electrician is testing a PLC-controlled system. A proximity sensor is used to detect the presence of a metallic object. The sensor is a 3-wire NPN type. When the metallic object is detected, what should the output of the sensor typically be?
An NPN (Negative-Positive-Negative) transistor output sensor is a 'sinking' type. When activated, it connects its output to ground (0 V), drawing current from t
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Question: An electrician is testing a PLC-controlled system. A proximity sensor is used to detect the presence of a metallic object. The sensor is a 3-wire NPN type. When the metallic object is detected, what should the output of the sensor typically be?
Answer options:
- It provides a positive voltage output (+V). ✅ It provides a ground (0 V) output, sinking current.
- It goes into an open-circuit state.
- It changes its operating frequency.
Correct answer: It provides a ground (0 V) output, sinking current.
Explanation: An NPN (Negative-Positive-Negative) transistor output sensor is a 'sinking' type. When activated, it connects its output to ground (0 V), drawing current from the PLC input module.
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