26. Input Malfunctions: How to Troubleshoot PLC Inputs ( 26 of 35 )

August 15, 2026 JoeGuardian 0

PLC input problems are very common in industrial automation.

A machine may stop, refuse to start, stay stuck in a sequence, or show an HMI alarm because the PLC is not …

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13. Sensor Troubleshooting: When the PLC Does Not See the Input (13 of 41)

July 2, 2026 JoeGuardian 0

One of the most common problems in industrial automation is this:

The sensor detects the target, but the PLC input does not turn ON.

Sometimes the sensor LED is ON.Sometimes the sensor …

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8. Inductive Proximity Sensors: How They Detect Metal (8 of 15)

May 25, 2026 JoeGuardian 0

Introduction

Inductive proximity sensors are one of the most common sensors used in industrial automation. They are designed to detect metal objects without physical contact.

In PLC systems, inductive proximity sensors are …

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