How to Wire NPN/PNP Proximity Sensors to Siemens PLC? Wiring Guide & Troubleshooting
The signal matching between inductive proximity sensors and PLC systems is the foundation of stable industrial automation operation. Most production line malfunctions, inaccurate counting, and sensor signal failures are caused by incorrect NPN/PNP selection and non-standard PLC wiring. This article comprehensively explains the features of Siemens PLCs, differences between NPN and PNP proximity sensors, practical application scenarios, standard wiring procedures, and common on-site fault troubleshooting methods, helping automation engineers solve commissioning and maintenance problems efficiently.