Wincc Rest Api _top_ May 2026

The WinCC REST API is a self-hosted service available in SIMATIC WinCC (V7.5 SP2 or higher) and WinCC Unified that enables external applications to securely interact with SCADA Runtime and configuration data using standard HTTP methods and JSON. Core Capabilities

Features and Benefits

Part 3: Getting Started – Enabling the REST API

To use the WinCC REST API, you must enable the service on the HMI server. wincc rest api

Reading and writing real-time tag values and configuration data. Historical Retrieval: The WinCC REST API is a self-hosted service

Deep Dive: WinCC Open Architecture (OA) REST API

WinCC OA offers a more enterprise-grade, flexible REST API. It is part of the standard HTTP manager. Dashboard: backend service polls WinCC REST for tag

The WinCC REST API (Representational State Transfer Application Programming Interface) is a modern, flexible interface introduced to bridge the gap between traditional industrial automation (OT) and standard IT systems. It allows external applications to interact with Siemens SIMATIC WinCC using standard HTTP methods and JSON data formats.  Key Components of WinCC REST Functionality 

try: # Send GET Request with Basic Auth response = requests.get( url, auth=(username, password), verify=False # Set to True if you have valid CA certificates )

Integration examples

• Dashboard: backend service polls WinCC REST for tag values, stores snapshots in time-series DB (e.g., InfluxDB), frontend displays charts via Grafana.
• Alerting: a small service subscribes to /api/alarms and forwards critical alarms to Slack/Teams/email.
• ETL: scheduled job queries historical data and exports CSV for analytics.

• Basic Authentication: The simplest method where the client sends a Base64 encoded username and password in the header.
• Token-Based (JWT): For better security and performance, you typically authenticate once to obtain a JSON Web Token (JWT) and use that token for subsequent requests.