Wincc Rest Api -

Before the REST API, connecting SCADA to IT often required complex OPC servers or proprietary protocols. The REST API offers:

| Endpoint | Method | Description | |----------|--------|-------------| | /auth/login | POST | Authenticate user, receive session token. | | /auth/logout | POST | Invalidate session. | | /tags | GET | List all tags (names, types). | | /tags/<tag_name>/value | GET | Read value of one tag. | | /tags/<tag_name>/value | PUT | Write value to one tag. | | /tags/values | POST | Read multiple tags in one request. | | /tags/values | PUT | Write multiple tags. | | /alarms/current | GET | Get active alarms. | | /alarms/archive | GET | Get historical alarms (with filters). | | /users/current | GET | Get logged-in user info. |

Integrating Siemens WinCC with the REST API: A Comprehensive Developer's Guide

Unlocking Industry 4.0: A Comprehensive Guide to the WinCC REST API

The WinCC REST API is a self-hosted service available in and WinCC Unified that enables external applications to securely interact with SCADA Runtime and configuration data using standard HTTP methods and JSON. Core Capabilities wincc rest api

Once the REST service is enabled, the API needs to be secured to prevent unauthorized access. WinCC supports multiple authentication mechanisms.

If you are starting a new project today, consider WinCC Unified for a cleaner, more scalable REST API.

Whether you are building a custom analytics dashboard, integrating with SAP, or simply giving your shift supervisors a mobile view of the line, the WinCC REST API empowers you to break the proprietary chains of legacy automation.

Enabling mobile applications to read alarm states and acknowledge them remotely via HTTPS. 5. Security Measures for WinCC REST API Before the REST API, connecting SCADA to IT

/WinCC/REST/Alarms/Current

/WinCC/REST/Tags/TagName

| WinCC Version | REST API Support | |----------------------------|--------------------------------| | WinCC Professional (TIA Portal) | ✅ Yes (via WebUX / WebAPI) | | WinCC Advanced (TIA Portal) | ❌ No (limited web services) | | WinCC Classic (V7.x) | ⚠️ Via add-on (Web Service / OData) | | WinCC Open Architecture (OA) | ✅ Built-in REST API | | WinCC Unified (TIA Portal) | ✅ Native REST API (modern) |

import requests import json

The WinCC REST API acts as a secure gateway to the runtime environment. Depending on your WinCC version (such as WinCC Unified or WinCC V8), the API typically exposes endpoints to handle three core pillars of SCADA data: 1. Tag Management (Read/Write Process Values)

Developing custom web-based dashboards using React, Angular, or Grafana that display real-time machine KPIs without installing WinCC client software.

The WinCC REST API acts as a self-hosted HTTP service running within the WinCC Runtime environment. It relies on standard web mechanics to expose underlying database layers, tag logging engines, and alarm structures.