TwinCAT Validator FAQs

Question 1

What TwinCAT file types are supported by the validator?

Accepted Answer

TwinCAT Validator supports `.TcPOU` (Program Organization Units), `.TcIO` (I/O configurations), `.TcDUT` (Data Unit Types), and `.TcGVL` (Global Variable Lists) for validation, auto-fixing, and scaffolding.

Question 2

What types of issues does TwinCAT Validator check for?

Accepted Answer

It performs comprehensive validation checks including XML structural validity, code style (e.g., indentation, naming conventions), and 21 specific IEC 61131-3 Object-Oriented Programming (OOP) rules.

Question 3

What is TwinCAT Validator?

Accepted Answer

TwinCAT Validator is an MCP server designed to validate, auto-fix, and scaffold TwinCAT 3 XML files. It provides deterministic code quality tooling, especially beneficial when integrated with AI assistants.

Question 4

How does TwinCAT Validator integrate with AI assistants?

Accepted Answer

As an MCP (Model Context Protocol) server, it connects to various LLM clients (e.g., Claude Desktop, Cursor, VS Code). This integration empowers AI assistants with reliable, deterministic tools for generating and refining TwinCAT 3 code.

Question 5

Can TwinCAT Validator automatically fix code issues?

Accepted Answer

Yes, it features deterministic auto-fix pipelines for common TwinCAT XML issues. These include correcting indentation, CDATA formatting, property VAR blocks, and more, with guaranteed idempotent output.

TwinCAT Validator

TwinCAT Validator

Key Features

Use Cases

Key Features

Use Cases