How to connect the photoelectric switch? Wiring method of photoelectric switch

The photoelectric switch is more and more widely used in our daily life, and many friends want to know its wiring method. In fact, the installation and connection of photoelectric switch is not complicated, but the wiring of different brands and models of photoelectric switch is slightly different. Let's take Mitsubishi FX series photoelectric switch as an example to talk about the wiring method of power-off switch for your reference in specific operation. The photoelectric switch is more and more widely used in our daily life, and many friends want to know its wiring method. In fact, the installation and connection of photoelectric switch is not complicated, but the wiring of different brands and models of photoelectric switch is slightly different. Let's take Mitsubishi FX series photoelectric switch as an example to talk about the wiring method of power-off switch for your reference in specific operation.

Wiring method of photoelectric switch

Take Mitsubishi Asia FX-PLC photoelectric switch as an example. The input terminal of Mitsubishi FX-PLC can accept both current input and current output (that is, the input terminal of FX-PLC can be connected with both drain input and source input). The key is to master the wiring mode. The specific connection mode is as follows: NP N photoelectric switch is connected with leakage input mode, only the switch output end (+) of the proximity switch is connected with the input end of PLC, and the other end (-) of the proximity switch is connected with the COM end of PLC. When PNP proximity switch is connected as power input, the 24V+ terminal of PLC should be connected to the negative pole of external power supply, the positive pole of external power supply should be connected to the (+) terminal of proximity switch, and the other end (-) of proximity switch should be connected to the input terminal of PLC.

Wiring principle of photoelectric switch

In fact, PNP and NPN sensors use the saturation and cutoff of triode to output two states, which belong to switching sensors. But the output signals are completely opposite, that is, high level and low level. The PNP output is low level 0,0, and the NPN output is high level 1. PNP and NPN sensors (switch type) are divided into six categories: NPN-NO (normally open type); NPN-NC (normally closed); NPN-NC+NO (normally open and normally closed * * *); PNP-NO (normally open); PNP-NC (normally closed); PNP-NC+NO (normally open and normally closed * * *). PNP and NPN sensors generally have three outgoing lines, namely power supply line VCC, 0V line and out signal output line.

NPN class: NPN means that when the signal is triggered, the signal output line OUT is connected with the power supply line VCC, which is equivalent to the power supply line that outputs a high level. For NPN-NO type, when there is no signal trigger, the output line is suspended, that is, the VCC power line and the OUT line are disconnected. When a signal is triggered, it emits the same voltage as the VCC power line, that is, the OUT line is connected with the VCC power line and outputs a high level VCC. For NPN-NC type, when there is no signal trigger, it sends OUT the same voltage as VCC power supply line, that is, the out line is connected with VCC power supply line and outputs high level VCC. When a signal is triggered, the output line is suspended, that is, the VCC power line and the out line are disconnected. For NPN-NC+NO type, there is actually an additional output line OUT, which can be selected as required. ?

PNP class: PNP means that when a signal is triggered, the signal output line OUT is connected to the line 0V, which is equivalent to a low-level output of 0V. For PNP-NO type, when there is no signal trigger, the output line is suspended, that is, the 0V line and the out line are disconnected. When a signal is triggered, it will emit the same voltage as 0V, that is, the OUT line is connected with 0V line, and the output is 0V at low level. For PNP-NC type, when there is no signal trigger, it sends OUT the same voltage as the 0V line, that is, the out line is connected with the 0V line and outputs a low level 0V. When a signal is triggered, the output line is suspended, that is, the 0V line and the OUT line are disconnected. For PNP-NC+NO type, similar to NPN-NC+NO type, there is an additional output line OUT and two output lines with inverted signals, which can be selected as required. We usually use NPN, which is advanced active state. PNP is rarely used.