How to Wire a Safety Light Curtain? (NPN/PNP Wiring Diagrams + Common Issues)

Summary

Incorrect wiring of a safety light curtain can not only cause it to malfunction but also create serious safety risks. This article, combined with detailed wiring diagrams, explains the wiring methods for the emitter and receiver, the differences between NPN and PNP output logic, normally open and normally closed circuits, common wiring issues, and practical application cases — helping you gain a comprehensive understanding of safety light curtain wiring.