System And Operating Modes Of The S7-400H - Siemens SIMATIC S7-400H Manual

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
4.1
4.2
4.3
4.4
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04
You Will Find
Introduction
System Modes of the S7-400H
Operating Modes of the CPUs
Time Response
4
On Page
4-2
4-5
4-6
4-12
4-1