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LogixDesigner-MCP

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Python

LogixDesigner-MCP

MCP server wrapping the Rockwell Automation Logix Designer SDK (Studio 5000) as typed MCP tools, bridged from Windows to Linux via Cloudflare Tunnel.

A Hermes Agent can open ACD files, export to L5K/L5X, read rung logic, enumerate tags and program structure, run verification — all over a typed MCP interface — without ever touching Studio 5000's GUI.

Architecture

Linux (Hermes) ── SSE/HTTPS ──→ Cloudflare Tunnel ──→ Windows
                                                          │
                                              FastMCP ── pythonnet ── Logix Designer SDK
                                              localhost:8765

The Linux side runs mock-based tests; all COM-dependent logic lives on the Windows deployment.

Related MCP server: T-IA Connect (Siemens TIA Portal)

Tools

Tool

Description

get_sdk_info

SDK version, license status, availability

open_project(path)

Open an ACD — returns controller name/type/revision

close_project

Close the current project

project_status

Is a project open? Which one?

save_acd(path)

Save the open project as ACD

export_l5k(path)

Export to L5K text format

export_l5x(path)

Export to L5X XML format

import_l5k(path)

Import an L5K (create ACD from text)

get_controller_tags(scope?)

List controller/program-scope tags

get_program_structure

Programs → routines → rung counts

get_rung_logic(program, routine)

Rung-by-rung ladder text

get_task_structure

Controller task configuration

verify

Run controller verification

restart_host

Restart the SDK COM host

All tools that can fail return structured SdkError — no raw tracebacks.

Development (Linux)

python -m venv .venv
.venv/bin/pip install -e ".[dev]"
.venv/bin/pytest tests/ -v

Deployment (Windows)

See deploy/README.md. Requires:

  • Windows Server with Studio 5000 v33+

  • Logix Designer SDK installed

  • Python 3.11+

  • Cloudflare Tunnel (cloudflared)

deploy/install.bat        # Create venv, discover SDK, verify
deploy/cloudflared-config.yml   # Tunnel setup guide
deploy/hermes-config.yaml       # Hermes MCP client config

Project status

  • Phase 0: Project skeleton

  • Phase 1: Pydantic models, abstract SDK interface, mock implementation (Linux tested)

  • Phase 2: FastMCP server with 14 tools, error contract, async wrappers

  • Phase 3: Windows deployment artifacts

  • Phase 4: Real COM interop (RealSdkInterop) — requires Windows

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

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Resources

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