Sigmatek LASAL MCP Server

An Model Context Protocol (MCP) server for automating the Sigmatek LASAL software suite. It enables AI coding assistants (like Gemini, Claude, or Cursor) to inspect projects, apply structural CLASS 2 or VISUDesigner HMI changes, compile, download to hardware, read/write live PLC values, and control PLC execution.
[!WARNING] This is NOT an official Sigmatek product. This project is currently in active development, which means bugs and unpredictable behavior are highly likely. Do not use this on actual, active production projects without keeping a secure copy/backup of your files, or utilizing a robust version control system (like Git) to easily revert unwanted changes.

Features

• Project Navigation: Select the active project directory and auto-resolve .lcp and .lvp paths.

• CLASS 2 Automation:

  • Inspect project structure (classes, networks, connections, server/client channels).

  • Open and close the CLASS 2 IDE.

  • Apply structural edits (create/delete/rename networks, add/remove/rename objects, connect/disconnect channels, set init values).

  • Read and write class .st source files directly.

  • Compile projects and read compiler logs (errors and warnings).

• VISUDesigner Automation:

  • Inspect HMI projects (stations, datapoints, text lists, schemes).

  • Open and close VISUDesigner.

  • Apply changes headlessly (sync datapoints, edit properties, configure schemes, manage media assets, add code modules).

  • CSV translation import and export.

• PLC Runtime & Live Connection:

  • Configure target online IP addresses.

  • Download projects to the target PLC or HMI.

  • Read and write live channel values from a running PLC.

  • Start, stop, or query the current PLC runtime state.

Related MCP server: B&R Automation Studio MCP Server

Prerequisites

• Windows OS (Sigmatek LASAL suite runs exclusively on Windows).

• Node.js (v18 or higher recommended).

• Sigmatek LASAL Suite:

  • LASAL CLASS 2 (for PLC engineering).

  • VISUDesigner (for HMI design).

Installation & Setup

1. Clone the repository:
   git clone <repository-url>
   cd Lasal-MCP

2. Install dependencies:
   npm install

3. Build the server:
   npm run build

Configuration

Environment Variables

If Sigmatek LASAL is installed in non-standard paths, configure them using the following environment variables:

• LASAL_CLASS2_EXE: Full path to Lasal2.exe (Defaults to C:\Program Files (x86)\Sigmatek\Lasal\Class2\Bin\Lasal2.exe).

• LASAL_VISUDESIGNER_EXE: Full path to VISUDesigner.exe (Defaults to C:\Program Files\Sigmatek\Lasal\VISUDesigner\VISUDesigner.exe).

Connecting to MCP Clients

Claude Desktop

Add the following config to your %APPDATA%\Claude\claude_desktop_config.json:
{
"mcpServers": {
"lasal-mcp": {
"command": "node",
"args": [
"C:/path/to/Lasal-MCP/dist/server.js"
],
"env": {
"LASAL_CLASS2_EXE": "C:\\Program Files (x86)\\Sigmatek\\Lasal\\Class2\\Bin\\Lasal2.exe",
"LASAL_VISUDESIGNER_EXE": "C:\\Program Files\\Sigmatek\\Lasal\\VISUDesigner\\VISUDesigner.exe"
}
}
}
}

Available Tools

Development

• Run in developer mode (watch mode):
  npm run dev

• Use the MCP Inspector to debug and test tools interactively:
  npm run inspector