PLC NPN and PNP proximity switch connection mode -

General PLC has hardware manual, manual specific connection mode, there is a proximity switch priority reference manufacturer instructions, the following is commonly used PLC connection mode.

proximity switch into NPN and PNP, generally can be connected to the PLC input point, but need to pay attention to the connection mode, the PLC controller corresponds to the input voltage range.

if the PLC input has to connect power negative public end, choose the PNP, if public end to end of PLC controller input has connected the positive, of the power supply is choosing NPN. Part of the PLC input public fixed as the anode, so can only choose NPN, such as: mitsubishi FX2N series PLC

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 NPN output is low level 0, PNP 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 lead, that is, the power cord VCC, 0 v out signal output line. 1

PNP class PNP 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.

for PNP - 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.

for PNP - 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.

for NPN - NC + NO type, it is more than one output line OUT, choose according to need. 2

NPN NPN class refers to when a trigger signal, the signal output line out, and 0 v line connection, equivalent to the output low level, ov.

for NPN - When NO type, NO signal trigger, the output line is impending, is 0 v line and disconnect the out line. Signal when triggered, issued the same voltage as the OV, namely the out line and 0 v line connection, the output low level OV.

for NPN - 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 a signal when triggered, the output line is impending, is 0 v line and disconnect the out line.

for PNP - NC + NO type, and the NPN - NC + NO type, more than one output line OUT, and two inverse output signal line, choose according to need.

type NPN and PNP are commonly used, generally use Japanese NPN is more, Europe and the United States use more PNP

3 second line type proximity switch connection methods:

first find close to the switch power supply end and output end, determine the public the polarity of PLC, when the public end of the PLC for the anode, will close to the switch power supply connected to the input point, output input cathode.

when the public end of the PLC for the cathode, the power end of proximity switch to access the anode, output input input point. Such as: mitsubishi FX3U series of S/S on the tip of the public has access to the anode, so will the proximity switch power input X point, output terminal connected to the cathode ( Note: this is the power supply must be the same power supply)

4 three-wire system approach switch connection methods:

three-wire system of proximity switch will need to provide the power and will power the positive, the positive access power supply cathode connected to the negative signal is connected to the input point. PLC common power supply must be close to the switch power supply and the same power supply or there should be a current form circuit to work!

when choosing good NPN and PNP switch, close to the PLC input public side has been fixed is connected to the positive or negative, when choosing NPN, PLC only access the positive public end, when choosing a PNP, PLC public end only access to the cathode.

note: although some proximity switch for two line, but there are three wires, one of the root is shielded wire, should distinguish!

summary: PLC input methods generally fall into the source input or leakage model input, but not all of the definition of PLC are the same, such as mitsubishi's source type is defined as the input of public end connected to the cathode, Siemens source is defined as the input access the positive public end, so in this paper are negative on behalf of the current go to source type leakage type analysis.

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