8-1
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Communication Functions
In this chapter you will find an introduction to communications with fault-tolerant
systems and their specific characteristics.
You will learn the basic concepts, the bus systems you can use for fault-tolerant
communications and the types of connection.
You will learn how communications take place via fault-tolerant connections and
standard connections, and how to configure and program them.
• You will find examples of communication via fault-tolerant S7 connections
and will learn about their advantages.
• By way of comparison, you will learn how communication takes place over
S7 connections and also how you can communicate in redundant mode by
means of S7 connections.
In Section Description On Page
8.1 Fundamentals and Basic Concepts 8-2
8.2 Suitable Networks 8-5
8.3 Supported Communication Services 8-8
8.4 Communications via fault-tolerant S7 connections 8-8
8.5 Communications via S7 Connections 8-15
8.6 Communication Performance 8-21
8
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