在实际项目中，选择合适的通信协议至关重要。WinCC平台本身也支持这三大主流标准，下表将帮助你做出更明智的决策。
"results": [ "name": "Tank1_Level", "value": 72.5, "quality": "Good", "timestamp": "2026-05-31T12:00:00Z" , "name": "Line1_Speed", "value": 1250, "quality": "Good", "timestamp": "2026-05-31T12:00:00Z" ] Use code with caution. 3. Writing to Process Tags
Closely mirrored after the classic architecture, offering similar REST capabilities through specific configuration steps in the TIA Portal environment.
To get started with the WinCC REST API, you'll need: wincc rest api
The (and the related REST Connector ) is a modern interface introduced primarily in WinCC V8.0 and WinCC Unified to bridge the gap between industrial OT (Operational Technology) and standard IT environments. It allows external applications to interact with SCADA data using standard web protocols like HTTP and JSON. Core Functionality WinCC handles REST in two distinct ways:
: Query active alarms, historical logs, and remotely acknowledge alerts.
To change a value, you would switch to a POST request with a JSON payload. To get started with the WinCC REST API,
Navigate to the Web Navigator / WebUX or Connectivity settings. Enable the HTTP/HTTPS management service.
: Acts as a client. WinCC "actively" sends data out to external systems, such as pushing production metrics to a cloud service or a third-party web API. Key Features & Methods The API uses standard HTTP methods to manage resources:
All traffic must be encrypted to prevent eavesdropping and man-in-the-middle attacks. To change a value, you would switch to
Starting from WinCC V7.5 SP2, Siemens introduced a REST API, fundamentally changing the paradigm for data exchange. It acts as a bridge, connecting the robust world of OT with the flexible, ever-evolving realm of Information Technology (IT). This modern interface allows any application that supports the RESTful API specification to read or write WinCC data securely using standard HTTPS and JSON.
| 特性 | | OPC UA | MQTT | | :--- | :--- | :--- | :--- | | 协议基础 | 基于HTTP/HTTPS，是无状态的协议。 | 基于TCP、HTTPS等多种协议，功能丰富。 | 基于TCP/IP的轻量级发布/订阅协议。 | | 架构风格 | 客户端-服务器，请求-响应模式。 | 客户端-服务器模式，支持多种服务集。 | 发布者-代理-订阅者模式。 | | 数据格式 | 通常使用JSON或XML格式，易于Web解析。 | 内建数据模型，支持复杂结构化数据。 | 二进制或文本，通常较轻量。 | | 主要优点 | 简单易用 ，基于标准的Web技术，天然支持防火墙穿透，开发门槛低。 | 安全可靠 ，拥有完善的内置安全机制（加密、签名、授权），数据模型强大。 | 高可扩展性与低带宽 ，非常适合有大量传感器数据传输的场景。 | | 主要缺点 | 相比OPC UA，内置的安全性和丰富的数据模型较弱。 | 实现和配置相对复杂，资源消耗较高。 | 本身不定义数据模型，需要客户端和发布者之间约定数据格式。 | | 常见场景 | IT与Web集成 ：Web仪表板、移动App、云平台对接、MES/ERP数据交互。 | 复杂工业自动化 ：PLC到SCADA、PLC到MES的复杂数据交互，对安全性和数据完整性要求高。 | 物联网大数据 ：大规模传感器网络、远程监控、低带宽环境下的数据传输。 | | WinCC支持情况 | WinCC V7.5 SP2以上 、WinCC OA、WinCC Unified均支持。 | 全线WinCC产品 深度支持，是工业通信的主导标准。 | WinCC V8以上 及WinCC OA等版本支持MQTT驱动和连接器。 |
I can provide a specific configuration guide or a script to get your first API call running. Share public link