logix-mcp

MCP server for live tag access to Rockwell Automation Logix5000 controllers (ControlLogix / CompactLogix) over EtherNet/IP (CIP), using pycomm3.

This talks directly to a running controller on the network. It does not require Studio 5000 Logix Designer to be installed, and it does not touch project files (.ACD/.L5X) or automate the Logix Designer application itself — that's a separate integration path if you need it later.

Tools

Tool	Purpose
studio5000_discover_plcs	Broadcast-discover EtherNet/IP devices on the local network
studio5000_get_controller_info	Connect and return controller identity (name, revision, serial, etc.)
studio5000_list_tags	List controller/program tag definitions (name, data type, dims, access)
studio5000_read_tag	Read one tag's live value
studio5000_read_tags	Batch-read multiple tags in one round trip
studio5000_write_tag	Write one tag's value
studio5000_write_tags	Batch-write multiple tags in one round trip
studio5000_disconnect	Close a cached connection to a controller path

Every tool takes a path (CIP path to the controller): a plain IP assumes backplane slot 0 (192.168.1.10); append /<slot> for a specific ControlLogix backplane slot (192.168.1.10/1).

⚠️ Safety note

Writes are unrestricted by design — there is no read-only gate, no dry-run mode, and no tag allowlist. Any tool call that reaches studio5000_write_tag or studio5000_write_tags will write to the live controller immediately, and that can change the state of real, running physical equipment. Point this at a test/offline controller while getting familiar with it, and only connect it to a production controller path once you trust the calling context.

Setup

cd studio5000-mcp
py -m venv .venv
.\.venv\Scripts\python.exe -m pip install -r requirements.txt

Register with Claude Code

claude mcp add studio5000 -- "C:\Users\fjgonzalez\Desktop\studio5000-mcp\.venv\Scripts\python.exe" "C:\Users\fjgonzalez\Desktop\studio5000-mcp\server.py"

Register with Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "studio5000": {
      "command": "C:\\Users\\fjgonzalez\\Desktop\\studio5000-mcp\\.venv\\Scripts\\python.exe",
      "args": ["C:\\Users\\fjgonzalez\\Desktop\\studio5000-mcp\\server.py"]
    }
  }
}

Manual test

.\.venv\Scripts\python.exe -c "import asyncio, server as s; print(asyncio.run(s.studio5000_discover_plcs()))"

Trademark disclaimer

This project is not affiliated with, endorsed by, or sponsored by Rockwell Automation, Inc. Studio 5000, RSLogix, ControlLogix, CompactLogix, and Logix5000 are trademarks of Rockwell Automation, Inc., used here solely to describe compatibility.