Proximity Switch Wiring Guide (1)

Usually after we buy the proximity switch, we may not have a good understanding of its installation and wiring, which may lead to some problems during the wiring. How to connect and what should be paid attention to when wiring. Let me explain it for you, hope Help everyone.

Proximity switches are distinguished by two-wire and three-wire systems. Three-wire proximity switches are divided into NPN type and PNP type, and their wiring is different.

The wiring of the two-wire proximity switch is relatively simple. The proximity switch is connected in series with the load and then connected to the power supply.

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 OV end of the power supply, and the yellow (black) wire is the signal, which should be connected to the load. The other end of the load is connected in this way. For NPN proximity switches, it should be connected to the positive end of the power supply; for PNP proximity switches, it should be connected to the OV end of the power supply.

The load of the proximity switch can be a signal, 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 modules can generally be divided into two categories: one type of public input terminal is the power supply OV, and the current flows from the input module (Japanese mode). At this time, the NPN proximity switch must be selected. The other type of public input terminal is the positive terminal of the power supply, and the current flows into the input module, that is, the well type input (European mode). At this time, the PNP type proximity switch must be selected.