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Can we use NPN sensor instead of PNP?
When used in a traditional relay type control circuit, it is normally possible to use either the PNP or the NPN type of sensor as shown below. PNP sensors tend to be more commonly used.
What is NPN PNP output?
An NPN output is commonly called a “sinking” output. When the sensor senses an object it will connect the output to the negative supply. A PNP output is commonly called a “sourcing” output. When it senses an object it will connect the output to the positive supply.
How can you tell PNP from NPN?
NPN and PNP transistors have very similar schematic symbols. The only difference is the direction of the arrow on the emitter. In a NPN (on the left) it points outward, for a PNP (on the right) it points inward.
What is the difference between NPN and PNP proximity sensors?
The PNP and NPN sensors are 3-wire DC devices. The difference is in the type of transistor used in the sensor. The PNP device has 2 power control leads, one connected to the positive one, the other negative. The third thread connects to the load. The PNP and NPN sensors are 3-wire DC devices.
What does it mean by NPN sensor?
The terms are describing the output polarity of sensors with digital logic output based on an output transistor in common emitter configuration. “PNP” refers to positive supply switching, “NPN” to ground switching. “PNP” is the output type needed to interface with industry standard PLCs. May 7, 2012
What is the difference between PNP and NPN configurations?
In a PNP configuration the load is connected between the OSSD output and GND . With an NPN configuration the load is connected between 24 VDC and the OSSD output switching element.
What does mean NPN and PNP?
This FAQ explains NPN and PNP transistors and what it means for sensors and IO module inputs. NPN stands for Negative, Positive, Negative . Also known as sinking. On an IO Module, an NPN input, when undriven is pulled down to be in a low state, GND ( or reference voltage level e.g. V-). PNP stands for Positive, Negative, Positive.