Siemens SIMATIC S7-400H - S7-400 H Installation Options

S7-400H
System Manual, 03/2012, A5E00267695-11
25
Fault-tolerant automation systems
2
2.1 Redundant SIMATIC automation systems
Operating objectives of redundant automation systems
Redundant automation systems are used in practice with the aim of achieving a higher
degree of availability or fault tolerance.
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Figure 2-1 Operating objectives of redundant automation systems
Note the difference between fault-tolerant and fail-safe systems.
The S7–400H is a fault-tolerant automation system. You may only use it to control safety-
related processes if you have programmed and configured it in accordance with the rules for
F systems. You can find details in the following manual: SIMATIC Industrial Software
S7 F/FH Systems (http://support.automation.siemens.com/WW/view/en/2201072
)