5-1
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
System and Operating Modes of the
S7-400H
This chapter features an introduction to the subject of S7-400H fault-tolerant
systems.
You will learn the basic concepts that are used in describing how fault-tolerant
systems operate.
Following that, you will receive information on fault-tolerant system modes. These
modes depend on the operating modes of the different fault-tolerant CPUs, which
will be described in the section that follows after that one.
In describing these operating modes, this section concentrates on the behavior
that differs from a standard CPU. You will find a description of the normal behavior
of a CPU in the corresponding operating mode in the Programming with STEP 7
manual.
The final section provides details on the modified time response of fault-tolerant
CPUs.
In Section Description On Page
5.1 Introduction 5-2
5.2 System Modes of the S7-400H 5-4
5.3 Operating Modes of the CPUs 5-5
5.4 Self-test 5-11
5.5 Time Response 5-14
5.6 Evaluation of Process Interrupts in the S7-400H System 5-14
5
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