Use ChatGPT with TIA Portal
GPT-4 Generates PLC Code Directly
Connect ChatGPT (GPT-4o, o3) to Siemens TIA Portal via the MCP protocol. Generate SCL function blocks, create tags, manage data blocks — all from a chat window, with no copy-paste.
Can ChatGPT Write TIA Portal Code?
Yes — but only if it has access to your project. ChatGPT alone generates generic SCL snippets that don't match your naming conventions, existing UDTs, or project structure. You end up copy-pasting, reformatting, and debugging by hand.
T-IA Connect solves this. It connects ChatGPT (GPT-4o, o3, or any OpenAI-compatible model) directly to TIA Portal via the MCP protocol. The AI reads your actual project, understands your existing code, and writes directly into your blocks — no clipboard, no formatting errors, no manual transfer.
How to Connect ChatGPT to TIA Portal
Three steps to give ChatGPT full access to your TIA Portal project
1. Install T-IA Connect
Download and install T-IA Connect on your engineering workstation. It starts a local MCP server alongside TIA Portal — no cloud infrastructure, no complex configuration.
2. Configure Your AI Client
Add T-IA Connect as an MCP server in VS Code, Cursor, or any OpenAI-compatible client. ChatGPT instantly gains access to 390+ TIA Portal operations: read blocks, create FBs, manage tags, compile.
3. Start Generating Code
Describe what you need in plain language. ChatGPT reads your project context, generates SCL code that matches your conventions, and writes it directly into TIA Portal. Then compiles and verifies.
OpenAI Models — All Supported
T-IA Connect works with every OpenAI model via the standard MCP protocol
GPT-4o (OpenAI)
Fast and capable for everyday PLC tasks — tag creation, block documentation, SCL generation, code refactoring. The go-to model for most TIA Portal automation workflows.
o3 / o4-mini (OpenAI)
Reasoning-focused models ideal for complex control logic, safety interlocks, and state machine design. Slower but significantly more thorough for critical code.
Claude (Anthropic)
Best-in-class SCL code generation. Claude Sonnet and Opus excel at understanding industrial conventions, IEC 61131-3 patterns, and generating production-ready structured text.
Local Models (Ollama)
Run Llama 3.1, Qwen 2.5 Coder, or Mistral locally for air-gapped environments. Zero cloud dependency, full data sovereignty — IEC 62443 compatible.
GitHub Copilot
Use GitHub Copilot's AI with TIA Portal project context. T-IA Connect provides the PLC project awareness that Copilot lacks on its own, turning it into a genuine PLC assistant.
Any MCP-Compatible Client
Any tool supporting the Model Context Protocol works — Windsurf, Continue, Zed, custom integrations. The protocol is open, standardized, and vendor-neutral.
What ChatGPT Can Do with TIA Portal
Real engineering tasks automated with GPT-4 via MCP
Generate SCL Function Blocks
Tell ChatGPT: "Create an FB for conveyor control with speed ramp, fault handling, and maintenance mode." It generates the SCL code and creates the block in TIA Portal — matching your existing naming conventions.
Build Tags from IO Lists
Paste your IO list and let ChatGPT create all PLC tags, data blocks, and symbolic addresses automatically. A 500-row IO list becomes a complete TIA Portal tag table in seconds.
Document Existing Blocks
Point ChatGPT at undocumented legacy code. It reads the SCL logic, understands the intent, and generates block comments, interface descriptions, and technical documentation.
Migrate IL to Structured Text
IEC 61131-3 Edition 4 removed IL. ChatGPT reads your Instruction List blocks, understands the logic, and rewrites them as clean SCL — ready to compile in TIA Portal.
Create UDTs and Data Structures
Describe your data model in natural language. ChatGPT creates the UDT definition, instance data blocks, and cross-references in one shot — all consistent with your project standards.
Compile, Test and Fix
ChatGPT compiles after writing code, reads the TIA Portal error output, and fixes issues automatically. Iterative development loop — no manual error hunting.
ChatGPT Web vs ChatGPT + T-IA Connect
The difference between generic AI chat and integrated MCP tooling for TIA Portal
| Capability | ChatGPT Web (Copy-Paste) | ChatGPT + T-IA Connect (MCP) |
|---|---|---|
| Project Context | ChatGPT web has no knowledge of your project structure, UDTs, tags, or naming conventions | T-IA Connect feeds your full project context to ChatGPT — it reads your existing blocks and tags before generating |
| Code Integration | Copy code from browser → paste into TIA Portal → fix formatting → debug → repeat every time | ChatGPT writes directly into TIA Portal blocks via MCP. No copy-paste, no formatting issues |
| Compilation & Validation | No way to verify generated code until you manually paste and compile — silent errors accumulate | ChatGPT compiles after writing, reads error output, and fixes issues — built-in validation loop |
| Multi-Step Workflows | Each chat message is isolated — no memory of previous steps or TIA Portal project state | ChatGPT chains operations: create UDT → create DB → write FB → compile → test. Full automation |
Frequently Asked Questions
Can ChatGPT generate TIA Portal code?
Yes — ChatGPT can generate TIA Portal SCL code when connected via T-IA Connect MCP. Without MCP, ChatGPT produces generic code with no knowledge of your project. With T-IA Connect, GPT-4o reads your actual blocks, tags, and UDTs — then writes compiled, project-aware SCL directly into TIA Portal.
Does ChatGPT work with TIA Portal V17, V18, V19, V20, V21?
Yes. T-IA Connect supports TIA Portal V17 through V21. ChatGPT connects via MCP and works identically across all supported versions. The MCP protocol abstracts the TIA Portal Openness API, so you don't need to change your AI setup when upgrading TIA Portal.
Is my PLC code sent to OpenAI?
When you use ChatGPT or GPT-4o, your project context is sent to OpenAI's API for processing — the same as using ChatGPT web. T-IA Connect itself never stores or transmits your data. For zero cloud exposure, use local models via Ollama (Llama, Qwen, Mistral) — they run entirely on your machine.
How do I connect ChatGPT to TIA Portal?
Install T-IA Connect on your workstation, then configure it as an MCP server in your AI client (VS Code with Continue, Cursor, or any OpenAI-compatible MCP host). T-IA Connect exposes 390+ TIA Portal operations to ChatGPT — block creation, tag management, compilation, PLCSim control. Full setup guide in our documentation.