truST LSP for VS Code

truST LSP brings IEC 61131-3 Structured Text productivity to VS Code:

• Fast diagnostics and semantic highlighting
• Go to definition/references, rename, and formatting
• Runtime panel with live I/O control
• HMI preview panel with live schema + value updates
• Debugging with breakpoints, step, continue, and runtime values
• ST test workflow with CodeLens + Test Explorer

Quick Start (1 minute)

1. Install truST LSP from the Marketplace.
2. Open a folder with .st / .pou files.
3. Start editing. Language features start automatically.

Command line install:

code --install-extension trust-platform.trust-lsp

Open the Runtime Panel (super quick)

1. Press Ctrl+Shift+P
2. Run Structured Text: Open Runtime Panel
3. Pick Local or External
4. Press Start
5. Set Inputs and watch Outputs update

What You Can Do

• Catch issues early with IEC-aware diagnostics
• Refactor safely: rename symbols and move namespaces
• Debug real logic with breakpoints + runtime state
• Drive and observe process I/O directly in the panel
• Run ST tests from CodeLens (TEST_PROGRAM / TEST_FUNCTION_BLOCK) and Test Explorer

Example Projects

examples/ are not bundled inside the Marketplace extension package.

Use the GitHub repo examples instead:

• Guided tutorial index: https://github.com/johannesPettersson80/trust-platform/tree/main/examples/README.md
• Filling line demo: https://github.com/johannesPettersson80/trust-platform/tree/main/examples/filling_line
• Plant demo: https://github.com/johannesPettersson80/trust-platform/tree/main/examples/plant_demo

Open it in VS Code:

1. Clone the repo
2. File -> Open Folder...
3. Select trust-platform/examples/filling_line
4. Run Structured Text: Open Runtime Panel

Screenshots

Debug + Runtime in one view

Runtime I/O panel

Rename across files

Commands You’ll Use Most

• Structured Text: New Project
• Structured Text: Import PLCopen XML
• Structured Text: Open Runtime Panel
• Structured Text: Open HMI Preview
• Structured Text: Start Debugging
• Structured Text: Attach Debugger
• Structured Text: Run All Tests
• Structured Text: Run Test
• Structured Text: Move Namespace
• Structured Text: Create/Select Configuration

PLCopen XML Import (UI Flow)

Use this when you want to create a truST project from an existing PLCopen XML file.

1. Press Ctrl+Shift+P.
2. Run Structured Text: Import PLCopen XML.
3. Pick the input XML file.
4. Pick the target project folder.
5. Confirm overwrite when importing into a non-empty folder.

The command runs trust-runtime plcopen import --json in the background and lets you open the imported project and migration report after completion.

Advanced Setup (optional)

Set custom binary paths if needed:

• trust-lsp.server.path
• trust-lsp.debug.adapter.path
• trust-lsp.runtime.cli.path

Full docs: https://github.com/johannesPettersson80/trust-platform/tree/main/docs