![]() When the proximity switch is activated, the blue (negative) wire and the black wire are connected to get a signal at both ends of the load. If the proximity sensor is NPN type, the black wire and the brown wire are connected to the positive pole of the power supply in parallel. When the proximity switch is activated, the blue wire and the brown wire are connected so that the two ends of the load can receive a signal. If the proximity sensor is PNP type, the black wire and the blue wire are connected to the negative pole of the power supply. The following is an example of a proximity sensor with 3-wire output. NC: The signal terminal is usually low level, when there is a signal input, the signal terminal is high level (positive) output.NO: The signal terminal is usually high level, when there is a signal input, the signal terminal is low level (negative) output. ![]() NPN type means that the signal output terminal outputs a low level output, and the internal switch is connected between the signal terminal and the negative pole.
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