truST¶

truST is a free IEC 61131-3 Structured Text IDE and runtime. Program PLCs in desktop VS Code with an IEC-aware language server, run them on a laptop or a Raspberry Pi, debug live, and expose browser HMI and automation surfaces from the same project.

Install truST Browse Examples

truST runtime workflow hero

Figure: VS Code with the Structured Text Runtime panel showing live I/O, memory, and compile diagnostics.

Capabilities¶

author Structured Text in VS Code with IEC-aware diagnostics, navigation, formatting, refactors, and debugging
run the same project locally or on a target device with trust-runtime
inspect live I/O, memory, and compile diagnostics through the runtime panel
expose the same project through /ide and /hmi when you want browser access
automate build, validate, test, deploy, rollback, and agent workflows from a shell

What truST Is¶

one project for authoring, runtime, debugging, browser access, and automation
desktop VS Code is the primary engineering surface, with the same project also available through the browser IDE and CLI/agent workflows
one runtime binary for Linux, Windows, macOS, and Raspberry Pi
open licensing, scriptable automation, and browser HMI pages shipped with the runtime
/ide and /hmi run against the same bundle you build and deploy

See It First¶

The desktop VS Code flow is the center of the product. These are the surfaces that make it different.

IEC-Aware Diagnostics¶

IEC-aware diagnostics in VS Code

Figure: The language server reports IEC-aware diagnostics directly in the Problems panel instead of only telling you that the file failed to parse.

Debug Live¶

Debugger paused at a breakpoint in VS Code

Figure: The debugger paused at a breakpoint with locals, call stack, inline values, and the runtime panel visible beside the code.

Rename Across Files¶

Rename across files in VS Code

Figure: Rename a Structured Text symbol across files from the editor and preview the affected definition before you apply the change.

Also In The Browser¶

Browser IDE

Figure: The same project can also be opened at /ide for browser-hosted editing.

Browser HMI

Figure: The same runtime can expose /hmi for operators and technicians.

Architecture¶

How truST fits together

Figure: Source files move through Build+Validate into artifacts (program.stbc, runtime.toml, io.toml, hmi/), then into trust-runtime, which exposes I/O drivers, the browser IDE at /ide, and HMI/control pages at /hmi.

Start Here¶

Project And Support¶

Maintainer: Johannes Pettersson
License: MIT OR Apache-2.0
Support: community issue tracker and maintainer contact

More detail lives on About, FAQ, and Changelog.