Result When Using Two Power Contactors - Siemens SINAMICS DCM User Manual

Evaluating the safety functions according to EN ISO 13849 when using two switching devices
10.5

Result when using two power contactors

DETECT
EVALUATE
RESPOND
PL
Average probability of a dangerous
failure per hour
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
PL
e
e
e
Result
d
7.32E-09
10.5 Result when using two power contactors
Average probability of a dangerous failure per hour
9.06 E-10
5.42 E-09
9.06E-10
Reason
The PL of all tasks of the supplementary safety function is at
least d.
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