What Is truST?

truST is an open IEC 61131-3 programming and runtime workspace for PLC-style control projects.

One project can be edited in VS Code or the Browser IDE, built and validated from the CLI, run by trust-runtime, viewed through Browser HMI, automated through the Agent API, and connected through runtime/plant communication surfaces.

Go To

Need	Open
install the tools	Install
program a PLC project	Program
run, deploy, or operate a system	Run
check hardware and target support	Hardware
look up commands, config, diagnostics, APIs, or specs	Reference

Product Model

Part	Role
VS Code extension	ST diagnostics, navigation, formatting, visual editors, runtime panel, debugger, AI tools
Browser IDE	runtime-hosted editing surface at /ide
Browser HMI	operator/runtime pages at /hmi
trust-runtime	execution engine, CLI workflows, runtime control, web UI
Agent API	JSON-RPC automation for scripts, CI, and agent loops
truST Mesh / protocols	runtime-to-runtime and plant communication paths

Core Idea

truST keeps the important state in reviewable project files:

• ST source
• runtime.toml
• io.toml
• hmi/
• generated bundles such as program.stbc
• interchange artifacts such as PLCopen XML

That is the point of One Project, Every Surface: the editor, runtime, HMI, automation, AI tools, and communication surfaces do not become separate project models.

Proof

A real-product tour of the same project across desktop VS Code, diagnostics, debugging, Browser IDE, and Browser HMI.

Rename a Structured Text symbol across files and preview the affected definition before applying the change.

Source files move through build and validation into runtime artifacts, then into trust-runtime, /ide, and /hmi.

Project Links

• About
• FAQ
• Changelog