Wincc Rest Api -

The exact URL structure varies by version. Common endpoints are:

For detailed technical specifications and API endpoint documentation, refer to the Siemens Industry Online Support (SIOS) portal WinCC RT Professional documentation sample Python script to demonstrate how to read a tag value using this API?

Let’s use (TIA Portal V18+) as our reference—it’s the most straightforward.

External Client (Python, C#, JavaScript, Power BI, etc.) │ │ HTTPS (JSON) ▼ ┌───────────────────────┐ │ WinCC REST API │ │ (Web server built │ │ into WinCC Runtime) │ └───────────┬───────────┘ │ Internal process communication ▼ ┌───────────────────────┐ │ WinCC Runtime │ │ (Tag Manager, Alarms,│ │ Archive, Security) │ └───────────┬───────────┘ │ Industrial protocol (S7, Profinet, etc.) ▼ ┌───────────────────────┐ │ PLC / Field Devices │ └───────────────────────┘