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Reference Tables
Detailed and extensive content for special project adaptation.
Driver Characteristics
The driver characteristics overview tables.
Characteristics - Single Driver
Modbus
Modbus Server

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Release Notes, Update information, Certifications and Frequently Asked Questions.
Concepts
Your first step into modern and powerful process visualization.
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Topics, you need to know, before using WinCC OA.
Security
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Engineering
Powerful tools for easy or complex engineering tasks.
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.
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.
- WinCC OA Configuration Files
  Several configuration files are used in a WinCC OA project. This chapter gives you a brief overview of the different configuration files.
- Manager options, basics
  An introduction to using the manager options available in WinCC OA.
- Internal data point types
  The overview of the internal data point types available in WinCC OA.
- Data point configs
- Data Types
  An overview of the data types available in WinCC OA.
- Driver Characteristics
  The driver characteristics overview tables.
  - Comparison - All Drivers
  - Characteristics - Single Driver
- Error Messages
  The overview of error messages available in WinCC OA.
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.

Modbus Server

General


Driver	Protocol	Protocol standard / version	Official protocol certification	Included in Base License Package?	Additional Licensing Requirements	License Key (Code Meter)	Operating System
Modbus/TCP Server	MODBUS TCP	IEC 61158 - Modbus	❌	❌	-	Modbus Server	Windows \| Linux

Network


Driver	Encrypted communication to periphery device	Client Or Server / TCP or UDP	Default Port	Firewall Direction
Modbus/TCP Server	❌	TCP Server	502	inbound

Configuration Details


Driver	Recommended/technical limit of connections per driver	Multiple driver instances	Redundant network	Redundant devices	Special hardware requirements
Modbus/TCP Server	100	✔ (different port)	N/A	N/A	❌

Communication


Driver	Polling	Poll on use	Single query	Unsolicited communication	Driver redundancy: Only active driver polls	Buffering
Modbus/TCP Server	N/A	N/A	N/A	N/A	N/A	❌

Engineering


Driver	Direct browsing of configuration/address data from connected devices	Import functionality of configuration/address data from external tools	Deletion of internal connection DP is supported
Modbus/TCP Server	❌	❌	✔

Special Telegrams


Driver	Native alarm transfer from connected devices / PLCs	Connection establishment without active address
Modbus/TCP Server	N/A	N/A

Timestamps and Synchronization


Driver	Timestamp transfer from periphery device	Time synchronization (WinCC OA to PLC)
Modbus/TCP Server	❌	❌