Understand the difference between PNP and NPN sensors
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To ensure 24 VDC sensors and PLC discrete input (DI) modules are connected properly, one must understand the differences between PNP or NPN style and when or where it makes sense to use each one. Learn the benefits and cautions for each as well as how sourcing and sinking come into play.
The full article Sensor Connections: PNP versus NPN and Sourcing versus Sinking is available to read at Allied Electronics & Automation.
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