Wincc Rest Api ~upd~ Jun 2026

Consult your specific WinCC product manual and REST API reference for exact endpoint definitions, payload schemas, and security setup.

This write-up focuses primarily on the , as it is the discrete "REST API" add-on most commonly inquired about for integration projects.

To ensure a robust and secure integration, follow these essential guidelines:

The WinCC REST API is designed to work exclusively over for secure communication. This requires an SSL/TLS certificate. For testing or internal networks, a self-signed certificate can be used.

Industrial tags include a "Quality Code". Always check this code in your code. If the quality is "Bad" (e.g., due to a disconnected sensor), your IT application should ignore the data or flag an error. wincc rest api

Using the method in the WinCC REST API (introduced in WinCC V8.0) is primarily used for writing tag values to the Runtime or for initial authentication . Key Uses for POST

使用WinCC REST API主要分为（WinCC项目）、 安全与权限配置 两部分。

The WinCC REST API marks a massive evolution in industrial software interoperability. By translating complex PLC and SCADA environments into standard web resources, Siemens gives developers the tools to unlock siloed operational data. Whether you are building custom mobile interfaces, optimizing supply chains, or feeding enterprise analytics, the REST API serves as the reliable, secure, modern bridge your OT-IT convergence strategy needs.

Depending on the version, certain REST endpoints allow developers to programmatically manage users, monitor server health, or check the status of specific redundant nodes. Comparison: WinCC V7/V8 vs. WinCC Unified REST API Consult your specific WinCC product manual and REST

The true power of the REST API lies in its simplicity. Any language with an HTTP library can integrate with it. Here are examples of reading a tag value in C# using the popular RestSharp library and in Python using the requests library.

The open-source community has also built unofficial wrappers (e.g., pyWinCC or Node-RED contrib nodes), but this article focuses on the official Siemens REST API available in TIA Portal WinCC Professional.

/WinCC/REST/Archives/ArchiveName/Values?tag=Tag1&startTime=2025-03-01T00:00:00Z&endTime=2025-03-02T00:00:00Z&interval=1m

By default, browsers restrict web apps from making requests to a different domain/port than the one they served from. The WinCC REST API server must be configured to allow CORS headers if you are hosting a frontend dashboard on a different server that queries WinCC directly. This requires an SSL/TLS certificate

Create a dedicated user account for the external API client (e.g., api_service_user ).

The REST (Representational State Transfer) interface is a software architecture that uses web protocols to exchange data. In the context of WinCC, the API provides a secure way to read and write process values, manage alarms, and access historical data. Unlike traditional OLE-DB or OPC UA connections, REST is platform-independent and can be consumed by almost any modern programming language, including Python, JavaScript, and C#. Key Capabilities and Features

Access the WinCC archive databases seamlessly. You can pull historical trends for specific time frames to perform deep data analytics, predictive maintenance modeling, or compliance reporting. Real-World Use Cases

public async Task<string> ReadWinCCTag(string urlBase, string tagName, string accessToken)