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	Buffering
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)	❌