ThinkPLC-MCP

ThinkPLC-MCPis a server designed to interface withSIEMENS PLC S7-1500/1200using theirJSON-RPC 2.0 API. It exposes API functionalities asMCP tools, enabling AI assistants and other MCP-compatible clients to interact with the PLC programmatically.

- Connects to aSIEMENS PLC API (Webserver)endpoint
- Provides MCP tools for:

- ✅ User authentication (login,logout,ChangePassword-user)
- ✅ Check PLC connectivity (ping)
- ✅ Retrieve user permissions viaApi-GetPermissionsafter login
- ✅ Get API version withApi-Version
- ✅ List available API methods usingApi-Browse
- ✅ Retrieve structure information withApi-GetQuantityStructures
- ✅ Get password security policies withApi-GetPasswordPolicy
- ✅ Browse tags and metadata usingPlcProgram-Browse
- ✅ Read single variables viaPlcProgram-Read
- ✅ Write Boolean, Number, or String tags withPlcProgram-Write-*
- ✅ Read the current CPU operating mode withPlc-ReadOperatingMode
- ✅ Request a change of operating mode usingPlc-RequestChangeOperatingMode
- ✅ Read the CPU system time (Plc-ReadSystemTime)
- ✅ Set the CPU system time (Plc-SetSystemTime)
- ✅ Read available project languages (Project-ReadLanguages)
- ✅ Browse active alarms (Alarms-Browse)
- ✅ Acknowledge alarms (Alarms-Acknowledge)
- ✅ Browse diagnostic buffer entries (DiagnosticBuffer-Browse)

- Node.js(v18.x or later recommended)
- npm (comes bundled with Node.js)
- Access to a runningSIEMENS PLC API (Webserver)

export const config = { URL: "https://<PLC-IP-Address>/api/jsonrpc", // required userName: "your-username", // optional pwr: "your-password", // optional };

{ "mcpServers": { "ThinkPLC-MCP": { "command": "npx", "args": ["mcp-remote", "http://localhost:5000/mcp"] } } }

- Ensure @modelcontextprotocol/tools is installed:

npm install -g @modelcontextprotocol/tools

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