Siemens SIMATIC CPU 410 System Manual page 356

Supplementary information
18.15 Other options for connecting redundant I/Os
Figure 18-26 Flow chart for OB 1
Monitoring times during link-up and update
Note
If you have made I/O modules redundant and have taken account of this in your program,
you may need to add an overhead to the calculated monitoring times so that no bumps occur
at output modules (in HW Config -> Properties CPU -> H Parameter).
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CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC