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    PNP vs NPN: What Makes These Outputs Different?

    Three Q4X sensors each with an S15L inline indicator light connected to them, one light is green and the other two are orange

    Understanding Discrete Outputs

    So What’s the Difference Between PNP and NPN?

    PNP Outputs

    Line diagram of PNP (sourcing) output circuit with brown wire on top, blue wire in middle connected to black wire on bottom with load

    NPN Outputs

    Line diagram of NPN (sinking) output circuit with blue wire on top, brown wire in middle connected to black wire on bottom with load

    The Different Sensor Output Types

    When to Use PNP and NPN

    Start Improving Your Process

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