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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 Driver

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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
- Drivers
- Driver Specific Functions
- Error Messages
  The overview of error messages available in WinCC OA.
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Modbus Driver

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 Driver	MODBUS TCP \| MODBUS RTU/ASCII via TCP	IEC 61158 - Modbus	❌	❌	IO based	Modbus	Windows \| Linux

Network


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

Configuration Details


Driver	Recommended/technical limit of connections per driver	Multiple driver instances	Redundant network	Redundant devices	Special hardware requirements
Modbus/TCP Driver	1000, (Technical limit by Operating System Resources)	✔	✔	✔	Serial/TCP converter for Modbus RTU/ASCII

Communication


Driver	Polling	Poll on use	Single query	Unsolicited communication	Driver redundancy: Only active driver polls	Buffering¹
Modbus/TCP Driver	✔	❌	✔	✔ (UNICOS)	configurable	❌

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 Driver	❌	❌	✔

Special Telegrams


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

Timestamps and Synchronization


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