Q: Should I choose an NPN or a PNP sensor for my system?
A: The key to choosing correctly is checking what type of input the controller or system expects. If it needs a positive signal, use PNP; if it needs a negative signal, use NPN.
PNP sensor: Provides a positive signal when activated (when the sensor detects an object).
This is often preferred when the controller or device is designed to recognize a positive voltage as “ON.”
NPN sensor: Provides a negative signal when activated. This type of sensor is preferred when the system is not designed to receive voltage.
Date/Revision History
First review 09/25/2025 V1.0
Second review 09/25/2025 V1.1
Author:
Hector Vega, Technical Support Engineer
References
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