Evaluating the safety functions according to EN ISO 13849 when using one switching device
9.3 Evaluation of "Respond"
Application document for functional safety STO, SS1 (ISO 13849-1)
52 Compact User Manual, 09/2016, A5E34871844AM
Evaluation of a power contactor
d The values for determination are listed in the following ta-
D
Average probability of a dangerous
failure per hour
1.01 E-07
Determination of the PL, power contactor, channel 1
High MTTF
D
≥ 30 years (1,563.77 years)
direct monitoring using mirror contacts
Fulfilled It is assumed that the user has taken the necessary
measures.
3 One single failure does not result in the loss of the safety
Calculation of the MTTF
D
for power contactor, channel 1
B10 value power contactor
1 * 10
6
Manufacturers data SIEMENS AG
Percentage of dangerous failures
0.73 (73 %) Manufacturers data
average operating time in days per
365 days per year Assumption:
The device can be actuated
every day of the year
User
op
average operating time in hours
cycle
average time between the start of
two consecutive cycles of the com-
ponent
24 hours per cycle Assumption:
there is one day between
actuating the EMERGENCY
STOP (testing the
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