1proximity switchThere is a difference between two-wire and three wire systems. Three wire proximity switches are divided into NPN and PNP types, and their wiring is different.
2、 Two wire systemproximity switchThe wiring will be relatively simple, just connect the proximity switch in series with the load and then connect it to the power supply.
3、 Three wire systemproximity switchWiring method: Connect the red (brown) wire to the positive end of the power supply; The blue wire should be 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 as follows: for NPN type proximity switches, they should be connected to the positive terminal of the power supply; For PNP type proximity switches, they should be connected to the 0V terminal of the power supply.
4proximity switchThe load can be signal lights, relay coils, or digital input modules of programmable logic controllers (PLCs).
5、 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 has a common input terminal of 0V power supply, and current flows out from the input module (Japanese mode). In this case, NPN type proximity switches must be selected; Another type of common input terminal is the positive terminal of the power supply, where current flows into the input module, known as the trap input (European mode). In this case, it is necessary to choose a PNP type proximity switch. Don't choose the wrong one.
6、 The two-wire proximity switch is limited by working conditions. When it is turned on, the switch itself generates a certain voltage drop, and when it is turned off, there is a certain residual current flowing through it. Therefore, it should be considered when selecting. Although the three wire proximity switch has an additional wire, it is not affected by adverse factors such as residual current and works more reliably.
7、 Some manufacturers will simultaneously output the "normally open" and "normally closed" signals of the proximity switch, or add other functions. In this case, please follow the product manual for specific wiring.

Qizha (Shanghai) Automation Equipment Co., LtdWe have been committed to introducing *'s instruments and meters into China. Our business philosophy is: products+complete solutions+lifelong service. After years of hard work, we have provided imported products, equipment, and excellent services to over 2000 customers both domestically and internationally. The products we have introduced have been widely used in various fields such as metallurgy, petrochemicals, power, building materials, electronics, food, etc.
Since the establishment of the company, relying on strong technology and quality, fair and stable prices, a serious and responsible service attitude, adhering to the corporate philosophy of "integrity, quality, professionalism, service, and innovation", and with a business attitude of "diligence and pragmatism", we have provided automation solutions for thousands of enterprises and units. We are dedicated to providing every customer with comprehensive and timely pre-sales, in sales, and after-sales services, and have finally gained the unanimous trust and praise of our customers. Welcome all users to come and negotiate.