Wincc Rest Api __full__ [PRO]

This article provides a comprehensive guide to the WinCC REST API. We will explore its prerequisites, configuration steps, authentication mechanisms, core endpoints, programming examples, real-world use cases, and best practices. Whether you are an automation engineer, an IT developer, or a system integrator, this guide will equip you with the knowledge to seamlessly integrate your WinCC system into a broader digital ecosystem.

It’s an RPC-style HTTP API, not HATEOAS-driven. Endpoints are rigid, and discoverability is poor. You’ll live by the manual’s endpoint table.

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WinCC Classic (pre-TIA) has no official REST API. WinCC Professional (TIA Portal) does. WinCC Unified (web-native) has a completely different REST/WebSocket API. And WinCC OA has its own. The “WinCC REST API” is not a single standard across the family.

| 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. | This article provides a comprehensive guide to the

Utilizes HTTPS encryption and token-based authentication (OAuth2 or Basic Auth depending on the version) to ensure secure data transit across networks. Prerequisites and Configuration

The core idea is beautiful. The WinCC REST API allows external clients to: It’s an RPC-style HTTP API, not HATEOAS-driven

It relies on WinCC’s user groups or Windows authentication. Stateless token-based auth (like JWT) is absent for older versions. In practice, you either use session cookies (stateful) or Basic auth over HTTPS — which feels out of place in a modern cloud-native world.

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