There is a difference between the two-wire system and the three-wire system of the proximity switch, and the three-wire system proximity switch is divided into NPN type and PNP type, and their wiring is different.
The wiring of the two-wire proximity switch is relatively simple, and the proximity switch can be connected to the power supply after being connected to the load in series.
The wiring of the three-wire proximity switch: the red (brown) wire is connected to the positive end of the power supply; The blue wire is connected to the 0V end of the power supply; The yellow (black) line is the signal and should be connected to the load. The other end of the load is connected like this: for the NPN type proximity switch, it should be connected to the positive end of the power supply; For PNP type proximity switches, they should be connected to the 0V side of the power supply.
The load of the proximity switch can be a signal lamp, a relay coil or a digital input module of a programmable controller PLC.
Special attention should be paid to the type selection of the three-wire proximity switch connected to the PLC digital input module. PLC digital input module can generally be divided into two categories: one type of common input terminal for the power supply 0V, current flow from the input module (Japan form), at this moment, must choose NPN type proximity switch; The other type of common input terminal is the positive end of the power supply, and the current flows into the input module, that is, the well input (European form), at this moment, the PNP type proximity switch must be selected. Don't make the wrong choice.
The two-wire proximity switch is limited by the operating conditions, and the switch itself produces a certain voltage drop when it is turned on, and there is a certain amount of residual current flowing through the cut-off, which should be considered when selecting. Although the three-wire proximity switch has one more wire, it is not bothered by unfavorable factors such as the remaining current, and the operation is more reliable.
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