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

System and operating states of the S7-400H

8.1 System and operating states 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 states of the different fault-tolerant CPUs, which will be described in
the section that follows after that one.
In describing these operating states, 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 state in the
The final section provides details on the modified time response of fault-tolerant CPUs.
S7-400H
System Manual, 09/2007, A5E00267695-03
Programming with STEP 7
manual.
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