Siemens SIMATIC S7-400H System Manual page 441

Fault-tolerant systems
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Redundant CPU 417–5H in two separate racks, CCF = 1 %
S7-400H
System Manual, 03/2012, A5E00267695-11
Characteristic values of redundant automation systems
A.2 Comparison of MTBF for selected configurations
Factor
approx. 38
441

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