GXBridge — GX Works3 + PLC for AI agents

GXBridge turns Mitsubishi GX Works3 and a connected PLC into something you can simply talk to. It's a Model Context Protocol (MCP) server, so Claude — or any AI agent that speaks MCP — can open projects, write and build logic, download to the PLC, run/stop it, and read, write, and monitor live device values, all from plain natural language.

What you can do — just by asking

"Open my conveyor project and list all the program blocks and global labels."

"Write a Structured Text program: run the motor on Y0 when X0 is on and X1 is off, then build it."

"Read D100, and monitor X0–X7 and Y0–Y7 live while I test the panel."

"Compare this project against last week's backup and tell me what changed."

"Download the program to the PLC." — destructive operations require an explicit confirmation first.

Tool surface — 46 tools

| Area | Covers | |---|---| | Sessions | Open, close, list open projects | | Project ops | Save, save-as, rename, delete, verify, change PLC type | | Build | Build, rebuild | | Authoring | Create projects in Ladder, Structured Text, FBD, or SFC; author ST programs | | Inspection | List POUs, structured data types, global label lists, exported object details | | Objects & libraries | Export, rename, delete objects; export, register, delete libraries | | PLCopen XML | Export / import, including graphical layout | | Download / run | Get download files, download, upload, run, stop | | Communication | Online status, live monitoring, simulator control | | Devices | Status, read / write / monitor live device values |

Destructive operations — download, run/stop, delete, overwrite — require an explicit confirmation before they execute.

Remote engineering

GX Works3 only runs on Windows. GXBridge lets you work with it from a Mac, Linux, or another Windows machine as well.

Every programming mode

Whether your team works in Ladder Diagram, Structured Text, Function Block Diagram, or SFC, GXBridge creates projects in that language and authors logic for it — so AI assistance fits naturally into how you already engineer.

Why it matters

Industrial engineering tools are powerful but slow to operate by hand. GXBridge puts a capable AI in the driver's seat of that power: faster iteration, fewer repetitive clicks, easier onboarding, and a natural way to inspect, author, and test PLC programs — without giving up control or safety.

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_{GXBridge is proprietary. This repository is an overview; the source is not public.}