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Availability
How to get your system uptime to the maximum.
Redundancy
The high availability requirements of plant constructors and operators as well as the process and data security can be covered with the redundancy concept of WinCC OA.
Summary and relevant links

Version Information
Release Notes, Update information, Certifications and Frequently Asked Questions.
Concepts
Your first step into modern and powerful process visualization.
Deployment
Topics you need to know before using WinCC OA.
Security
Go beyond the norm in cybersecurity.
Engineering
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Data Management
Classify, structure and archive your data.
Business Logic / Control
Endless possibilities in data processing for your projects.
Data Visualization
User interfaces, Trends and Reports for every purpose and device.
Southbound Interfaces
The process connection to the actual machines/sensors.
Northbound Interfaces
Your portal to the cloud or supervising systems.
Web Connectivity / Network Interfaces
Data exchange, APIs and web technologies
User Management
All about authorization, authentication and login-customization.
Availability
How to get your system uptime to the maximum.
- Disaster Recovery System
- Redundancy
  The high availability requirements of plant constructors and operators as well as the process and data security can be covered with the redundancy concept of WinCC OA.
- Redundant network connections
  In order to achieve a better fault tolerance WinCC OA Managers can connect to other WinCC OA Managers running on different computers via redundant network connections (this means connecting through two network connections (= IP connection)).
- Alive mechanism of manager connections
  The alive mechanism in WinCC OA serves for connection controlling between the single managers. Each manager sends alive messages at definable intervals.
- Error tolerance and stability
  Continuous improvements are made concerning the error tolerance and reliability. This page gives an overview and description of the changes. Additional information can be found in the further chapters of the documentation.
- Kubernetes Health Check
  An introduction to health checks with Kubernetes for WinCC OA.
- Message Compression
  The message compression compresses WinCC OA messages. Data compression means encoding information using fewer bits than an unencoded representation would use through use of specific encoding schemes.
- Identification Caching
  The identification caching provides you an advantage especially when using remote user interfaces and distributed systems. Identification caching allows the identification to be sent as “delta” instead of the whole identification. Thus, only the changes are sent by the Data and the Dist managers.
- System Dashboard
  The System Dashboard in WinCC OA provides a central overview of system status, performance metrics, and security aspects. It helps operators and administrators quickly view and assess important information.
- NGA - High Availability Configuration (HAC)
  This chapter provides an overview of the High Availability Configuration for redundant or non-redundant WinCC OA projects (High Availability Configuration - HAC) and explains the roles of the components etcd and Patroni, which are required to set up HAC.
Reporting
Create state of the art project reports without limits.
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.
Documentation
Basic information about terms and functions within the documentation.
Support & Services
An experienced team of support agents, consultants and trainers are ready to facilitate active partnerships with our customers, so they can profit from our comprehensive service.
Disclaimer
A brief clarification of liability exclusions or legal notices.

Summary and relevant links

High availability and reliability are becoming more important in the automation technology. Even a short breakdown can result in heavy costs and security risks. The redundancy is used to guarantee plant management without any adverse effects in case of a failure and thus loss of data and associated problems do not occur.

The reliability in a redundant system with WinCC OA is implemented via hot standby. Hot standby is a hardware independent solution for high availability. This is a security concept consisting of two server systems connected with each other. Both servers are operating permanently and are subject to same functional demands (only one server is, however, always active. The second server synchronizes the data at runtime with the primary unit). If a unit fails a "flying switch" is executed and the server, which was passive until then, takes over the control. Thus, the access to data or functions is always guaranteed.

The connect and query functions to query datapoint values and other important related functions: