PLC Copilot

PLC Copilot is an AI assistant built specifically for programmable logic controller (PLC) programming. It helps automation engineers understand, document, and debug ladder logic programs. You load a project export (like an L5X file from Rockwell Studio 5000 or Siemens TIA Portal), then ask questions in plain English — "What triggers rung 847 to energize?" or "Summarize what the Conveyor_3 subroutine does." The AI reads the actual rungs, tags, and subroutines in your project and gives answers that cite the exact rung numbers and tag names. It runs locally on your machine, so your project data never leaves your computer.

The tool works with major PLC platforms including Rockwell Studio 5000 (ControlLogix, CompactLogix, GuardLogix) and Siemens TIA Portal. It's vendor-agnostic, so you can use it across different brands of controllers. The interface is a straightforward chat window — no complex setup. You open a project file, type your question, and get an answer with a "Jump to rung" link. PLC Copilot can also generate inline documentation for undocumented programs, turning a project with less than 10% coverage into one with 95% rung-level comments.

This tool is most useful for automation engineers who inherit undocumented PLC programs, maintenance teams troubleshooting production line faults, and engineers onboarding to new plants. The site claims it can cut fault diagnosis time from 3–6 hours to 20 minutes, and reduce the time to document a 2,000-rung project from 3 days to 3 hours. It's a practical, focused tool for a very specific industrial engineering workflow.