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Distributed systems
Distributed systems in WinCC OA allow to connect two or more autonomous WinCC OA systems via a network.
Summary and relevant links

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Web Connectivity / Network Interfaces
Data exchange, APIs and web technologies
- APIs
  An overview of the APIs (Application Programming Interface) available in WinCC OA.
- COM in WinCC OA
  COM stands for Component Object Model, a specification for developing modular software components which can be used by each COM compatible application. COM components can be easily integrated in such applications and can even be removed from an application at run time. COM components can be programmed in various different programming languages although C++ is used mostly. The specifications OLE, ActiveX and DirectX are based on the COM technology.
- Prometheus Interface
  The Prometheus interface (also referred to as Prometheus client) serves as a bridge between WinCC OA and Prometheus. It facilitates the retrieval, processing, and exposure of data from the WinCC OA system to a Prometheus-compatible format. This allows Prometheus to monitor and alert based on the data fetched from the WinCC OA system.
- SIMATIC PLC Discovery
  In increasingly dynamic automation environments and the merging of IT with OT, the SIMATIC PLC Discovery can help with the connection of newly added S7/S7+ devices by showing you all the devices in the network
- WinCC OA JavaScript Manager for Node.js
  The WinCC OA JavaScript Manager for Node.js is a manager that allows for the integration of the TypeScript/JavaScript runtime environment Node.js® into WinCC OA.
- SIMATIC Unified AR (Augmented Reality)
  SIMATIC Unified AR is an industrial Augmented Reality app that allows to display and operate HMI screens (WinCC Unified) and web applications (WinCC OA Dashboard) in real production environments.
- HTTP Server
  The HTTP Server integrates Internet technologies directly into WinCC OA . Implemented as an add-on for the Control Manager, possible applications are many and diverse. The HTTP Server can be used as a web server for static HTML pages including download facility or to generate dynamic HTML pages.
- XML-RPC
  XML-RPC (Extensible Markup Language Remote Procedure Call) allows software on different operating systems to make procedure calls over the internet. XML-RPC uses HTTP for the transport and XML for the encoding. It sends the procedure call to a remote server through HTTP. The call is an XML document and it receives the response as XML.
- REST Reporting API
  The REST Reporting API is integrated into the Standard web server and can be activated via the config entry enabled in the [restReporting] section.
- Distributed systems
  Distributed systems in WinCC OA allow to connect two or more autonomous WinCC OA systems via a network.
  - Distributed systems
    Distributed systems in WinCC OA allow to connect two or more autonomous WinCC OA systems via a network.
  - Requirements and installation
  - Application planning and hints on distributed systems
  - Principle and functionality
  - Creating a distributed system
  - One Way Dist
  - [dist]
    Settings for the Distribution Manager
  - Configuration file for distributed systems
  - Example on a redundant distributed system
  - Example on a Distributed System with different WinCC OA Versions
  - Summary and relevant links
  - Dist-Management
    Configuring and maintaining a distributed system in WinCC OA requires a high amount of engineering effort due to a high number of settings and configuration steps that must be applied on several systems. The Dist-Management reduces the engineering effort and simplifies the necessary settings.
- Dist-Management
  Configuring and maintaining a distributed system in WinCC OA requires a high amount of engineering effort due to a high number of settings and configuration steps that must be applied on several systems. The Dist-Management reduces the engineering effort and simplifies the necessary settings.
- XMPP
  XMPP (formerly Jabber) is mostly used in chat (instant messaging) applications and allows near real time communication between two or more parties. It can, e.g., be used to push information from a WinCC_OA project server to one or more persons, even allowing the recipient to send a confirmation back to the server.
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How to get your system uptime to the maximum.
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Addons
Useful tools and enhancements for special demands.
Reference Tables
Detailed and extensive content for special project adaptation.
Videos & Tutorials
Explore the capabilities of WinCC OA with our carefully selected collection of video tutorials and guides.
WinCC OA Documentation
Basic information about terms and functions within the documentation.
Disclaimer
A brief clarification of liability exclusions or legal notices.

Summary and relevant links

Distributed systems in WinCC OA allow to connect two or more autonomous WinCC OA systems via a network. Each sub system of a distributed system can be configured either as single-station system or multiple-station system in each case redundant or not redundant. A sub system means in this connection a server on which an Event manager is running on (this means not necessarily a complete project). In a redundant system both redundant running servers are considered as one system.

Each system can process and display data (values and alerts) of other systems. You can also access online values, alerts and history of each system by using distributed systems in WinCC OA ("distributed database"). When you access remote DPEs the data points of the sub systems are not copied to the local system. This means that the data points are not multiplied and you can only access the system when a connection to this specific system exists.


Chapter	Description
Create project	How to create different WinCC OA projects.
Installation under Windows	Description of the WinCC OA installation under Windows.
Installation under Linux	Description of the WinCC OA installation under Linux.
Redundancy	Description and use of the WinCC OA Redundancy.
dpConnect(), dpQuery(), dpQueryConnectAll() and dpQueryConnectSingle(). as well as isAnswer() and isRefresh()	The connect and query functions to query data point values.