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OlubunmiAde

plc-mcp-server

by OlubunmiAde

PLC MCP Server

A Model Context Protocol (MCP) server for industrial PLC integration. Enables AI assistants to read tags, monitor alarms, and interact with Allen-Bradley ControlLogix PLCs using natural language.

Features

  • šŸ­ Tag Operations - Read/write PLC tags

  • 🚨 Alarm Management - View and acknowledge alarms

  • šŸ“Š Diagnostics - PLC status, I/O health, connection info

  • šŸ”’ Safety First - Read-only by default, write whitelist, audit logging

  • šŸ”Œ MCP Standard - Works with Claude Desktop, Cursor, and any MCP client

Related MCP server: wago-plc-mcp-server

Quick Start

# Install dependencies
pip install -r requirements.txt

# Configure your PLC connection
cp config.example.yaml config.yaml
# Edit config.yaml with your PLC IP and settings

# Run the server (stdio mode for MCP)
python -m plc_mcp_server

# Or run in HTTP/SSE mode
python -m plc_mcp_server --transport sse --port 8080

Claude Desktop Configuration

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "plc": {
      "command": "python",
      "args": ["-m", "plc_mcp_server"],
      "cwd": "/path/to/plc-mcp-server"
    }
  }
}

Project Structure

plc-mcp-server/
ā”œā”€ā”€ plc_mcp_server/
│   ā”œā”€ā”€ __init__.py
│   ā”œā”€ā”€ __main__.py          # Entry point
│   ā”œā”€ā”€ server.py            # MCP server implementation
│   ā”œā”€ā”€ plc/
│   │   ā”œā”€ā”€ __init__.py
│   │   ā”œā”€ā”€ client.py        # PLC connection manager
│   │   ā”œā”€ā”€ allen_bradley.py # ControlLogix driver
│   │   ā”œā”€ā”€ siemens.py       # S7 driver (future)
│   │   └── modbus.py        # Modbus driver (future)
│   ā”œā”€ā”€ tools/
│   │   ā”œā”€ā”€ __init__.py
│   │   ā”œā”€ā”€ tags.py          # Tag read/write tools
│   │   ā”œā”€ā”€ alarms.py        # Alarm tools
│   │   └── diagnostics.py   # Status/diagnostic tools
│   ā”œā”€ā”€ resources/
│   │   ā”œā”€ā”€ __init__.py
│   │   └── tag_database.py  # Tag list resource
│   └── safety/
│       ā”œā”€ā”€ __init__.py
│       ā”œā”€ā”€ whitelist.py     # Write permission control
│       └── audit.py         # Audit logging
ā”œā”€ā”€ config.example.yaml
ā”œā”€ā”€ requirements.txt
ā”œā”€ā”€ pyproject.toml
└── tests/
    └── ...

Safety

This server controls industrial equipment. Safety is paramount.

  • Read-only mode by default (allow_writes: false)

  • Tag whitelist for write operations

  • All operations logged to audit trail

  • Confirmation required for writes (via MCP confirmation flow)

License

MIT

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Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

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