The difference between NPN type and PNP photoelectric switching sensors lies in the different output levels. NPN outputs low, PNP then outputs high. The type of photoelectric switch is a very specialized technical issue. What are photoelectric switches NPN and PNP? What are their differences?
1. The difference between NPN and PNP of photoelectric switch
Photoelectric sensor NPN output type (current inflow) PNP has two output types (current outflow). When the current flows out of the sensor (PNP output type), the current flows from the power supply through the output terminal of the sensor to the load and into the load, and then to the ground terminal. Current inflow. (When the NPN sensor is connected, the current flows from the power supply through the load to the sensor output, then to the ground terminal (GND), and finally to the system ground terminal.) PNP and NPN sensors usually have three output lines, the power line VCC. GND and OUT signal output line 1.NPN type NPN means that when the signal is triggered, the signal output line OUT and GND are connected, which is equivalent to the OUT output low level.
2. PNP type PNP means that when the signal is triggered, the signal output line OUT is connected to VCC, which is equivalent to the output high-level power line OUT.
NPN type photoelectric switch means that when the signal is triggered, the connection between the signal output line OUT and the 0V line is equivalent to the output low level 0V. For NPN-NO type, when there is no signal trigger, the output line is paused, i.e. the 0V line and the OUT line are disconnected. When there is a signal flip-flop, it announces the same voltage as the signal flip-flop V of 0, i.e. the out line is connected to the 0V line and the output is low level 0V. For the NPN-NC type, when there is no signal trigger, it announces the same voltage as the 0V line, i.e. the out line is connected to the 0V line and outputs a low level of 0V. When the signal is triggered, the output line is paused, i.e. the 0V line and the OUT line are disconnected from a similar NPN-NC+NO type. Add an output line OUT, and select two output lines with opposite signals according to your needs.
3. PNP type photoelectric switch
PNP photoelectric switch means that when the signal is triggered, the signal output line OUT is connected to the power line VCC, which is equivalent to the output of the high-level power line. For high-level power cords. PNP-NO type, in the absence of signal triggering, the output line is paused, that is, the VCC power line and OUT are disconnected. When a signal is triggered, send and send. The voltage of the VCC power line is the same, that is, the OUT line is connected to the power line VCC, and the output is high VCC. For PNP-NC type, the voltage of the VCC power line is the same, and there is no signal trigger, that is, the OUT line is connected to the power line VCC, and the output is high VCC. When the signal is triggered, the output line is paused, i.e., the VCC power line and the OUT line are disconnected. PNP-NC+NO is actually another output line OUT, which can be picked according to the demand.
What are photoelectric switches NPN and PNP? What are their differences? The PNP guiding voltage of the photoelectric switch drops, and the reverse withstand voltage drops; The NPN pilot voltage drop of the photoelectric switch is large, but the reverse withstand voltage is high. If the input is high and the output needs to be low, the NPN is chosen. If the input level is low and the output level demand is low, PNP is selected; If the input level is low and the output level demand is high, the NPN is selected; If the input is high and the output is high, PNP is selected. The NPN base voltage is high, and the electrode and emitter are short-circuited; The NPN base voltage is low, and the electrode and emitter are open, i.e., it is not operating. The PNP base voltage is high, and the circuit between the electrode and the transmitter is broken, that is, it does not operate; If the base is at high voltage, the PNP base is applied at a low potential, and the collector and emitter are short-circuited. We usually use it. NPN-type photoelectric switch, that is, the active-low state, PNP is rarely used.
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