In Tag Management , define which tags can be read or written via the REST API. You can assign specific user authorizations to these tags.
The WinCC REST API offers several features and benefits, including:
Before you go all-in, understand the constraints:
It is designed for high performance, making it the preferred choice for new greenfield installations. WinCC V7 / V8 Classic wincc rest api
I can provide a specific configuration guide or a script to get your first API call running. Share public link
Let’s assume your WinCC server is at http://192.168.1.100 . Here are the critical REST endpoints.
axios.get('https://<Host>:<Port>/WinCCRestService/tagManagement/Values/tag01', headers: 'Authorization': 'Basic ' + btoa('username:password') ).then(response => console.log('Tag value:', response.data); ); In Tag Management , define which tags can
Writing to WinCC tags uses the PUT method. The request specifies the target tag and the new value. For example, using Axios in JavaScript:
During FAT (Factory Acceptance Test), a Python script uses the REST API to inject values into WinCC, simulate faults, and verify HMI reactions—all without touching the operator panel.
"ScreenName": "Maintenance Overview"
"Name": "Tank_Level", "Value": 75.4, "Quality": "Good", "Timestamp": "2025-03-15T14:32:01Z"
Certificate issues typically manifest as connection closure errors during SSL handshake. Solutions include:
Avoid hammering the API with hundreds of individual tag requests per second. Use the API’s bulk endpoints to read or write multiple tags in a single HTTP payload. WinCC V7 / V8 Classic I can provide
The WinCC Connectivity Pack requires a valid license. Without proper licensing, the REST service will not function correctly. Verify the license status through Automation License Manager before proceeding.
Utilizes standard web security protocols to protect industrial assets. Implementation and Setup