Introduction
The Allen-Bradley MicroLogix 1400 is one of the most widely used compact PLCs in industrial automation. Known for its flexibility, affordability, and reliability, it has become a go-to choice for small to mid-sized applications across industries such as packaging, material handling, and utilities. Like all controllers, however, the MicroLogix 1400 needs to communicate with operators when something goes wrong. One of the key diagnostic tools it uses is the FAULT LED on the front panel.
When this light begins flashing, it signals that the controller has encountered a major problem and has halted operations to protect both the system and connected equipment. Understanding what the flashing fault light means—and how to respond—is critical for keeping downtime to a minimum. Let’s break down what this indicator really tells you and how to deal with it effectively.
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