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DroneDataSystems

LogixDesigner-MCP

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

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