PLC and NPN and PNP detailed analysis - selection and connection

PNP and NPN sensor is actually using the transistor saturation and globe, output two states, belong to the switch type sensor. But the output signal is opposite, namely, high level and low level. The PNP output is low level 0, NPN output is high level 1.

PNP and NPN sensors ( Switch type) Is divided into six categories:

1, NPN - 没有( Normally open type) 2,NPN型- - - - - - NC（ Normally closed type) 3,NPN型- - - - - - NC+NO（ Normally open, normally closed type of) 4、PNP- 没有( Normally open type) 5、PNP- NC（ Normally closed type) 6、PNP- NC+NO（ Normally open, normally closed type of)

PNP and NPN sensor generally has three pinout, namely, the power cord VCC, 0 v OUT signal output line. 1, NPN type NPN refers to when a trigger signal, the signal output line OUT, and the power cord VCC connection, equivalent to the output of high level power supply cord. The NPN - When NO type, NO signal trigger, the output line is impending, is the VCC to disconnect the power cord and OUT. A trigger signal, issued and the same voltage VCC power supply cord, namely the OUT line and the power cord VCC connection, a VCC output level. The NPN - NC type, when no signal trigger, and the same voltage VCC power supply cord, namely the OUT line and the power cord VCC connection, a VCC output level. When a signal when triggered, the output line is impending, is the VCC to disconnect the power cord and OUT. The NPN - NC + NO type, it is more than one output line OUT, choose according to need.

2, PNP PNP refers to when a trigger signal, the signal output line OUT, and 0 v line connection, equivalent to the output low level, 0 v. For PNP - When NO type, NO signal trigger, the output line is impending, is 0 v line and disconnect the OUT line. Signal when triggered, same as the 0 v voltage, also is the OUT line and 0 v line connection, output output low level 0 v. For PNP - NC type, when no signal trigger, same as the 0 v line voltage, which is the OUT line and 0 v line connection, the output low level 0 v. When there is a signal when triggered, the output line is impending, is 0 v line and when the output current for PNP and NPN can be used for any PLC

actually both PNP and NPN output of the sensor, as long as the output current can get the requirement of PLC, PLC can be used for any type of machine, it is that the programmer how to programming, FX - below 1 s series PLC controller for example:

1, FX1S for low level effectively. When using the N type sensor output, the program can be trigger pulse detection is set to rise. When sensors in place, can be normal test and implement the corresponding instructions.

2, was elected with p type, that is for the output of the high level, at this point, as long as the sensor output current can meet the requirements of the PLC machine 4 ma, just change the inspection to the litres of trigger pulse, when the sensor output signal is equal to 0 v - — 24 v mutations, known as a decline in the pulse, the PLC controller can also be normal test and implement the corresponding instructions. What they are, in fact, when choosing sensor, we should consider is how much is the PLC input terminal of the input current. ( Generally about 2 ma, Siemens and mitsubishi FX series about 7 ma, as long as the sensor requirements for or fill current, either P or N type sensor can be used.

mitsubishi FX is an internal circuit board glazing lotus root Yang connection, so can only use the NPN or units of Siemens PLC controller COM port is impending sharing can choose Yang and Yin connection, namely, depending on the type of selection decision, Yang connection can only use NPN Yin connection can only use the PNP, but how group PLC input COM side, can each group has a total Yang, a total of Yin to the difference between a lot.

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