REST API for Beckhoff
TwinCAT ADS

Authenticated HTTP access to PLC variables, symbols, device state,
lifecycle control, and real-time notifications.

Connect to multiple TwinCAT runtimes simultaneously. Callers use simple aliases — AMS Net IDs stay hidden.

Provider-agnostic OIDC/OAuth2 with hybrid RBAC + scopes. Per-PLC access control via JWT claims.

Subscribe to variable changes via SSE or WebSocket (SignalR). Shared subscriptions with reference counting.

Enable or disable feature slices via configuration. Disabled features return 404 and are excluded from OpenAPI.

Embedded ADS router eliminates the need for a local TwinCAT installation. Runs on Linux, macOS, and Windows.

OpenAPI spec with AI-optimized descriptions plus a built-in MCP server that lets AI assistants query PLCs through natural language.