Communication - Siemens SIMATIC S7-400H System Manual

Communication

11.1 Communication
This section provides an introduction to communications with fault-tolerant systems and their
specific characteristics.
It sets out the basic concepts, the bus systems you can use for fault-tolerant communications,
and the available types of connection.
It contains information on communication functions using fault-tolerant and standard
connections, and explains how to configure and program them.
● You will also find examples of communication over fault-tolerant S7 connections and learn
● By way of comparison, you will learn how communication takes place over S7 connections
S7-400H
System Manual, 09/2007, A5E00267695-03
about the advantages it offers.
and how you can also communicate in redundant mode by means of S7 connections.
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