Evaluation Of "Respond; Evaluation Of "Respond" With Two Power Switching Devices; Evaluation Of Two 3Wl Circuit Breakers Connected In Series - Siemens SINAMICS DCM User Manual

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

10.3 Evaluation of "Respond"

10.3 Evaluation of "Respond"
10.3.1

Evaluation of "Respond" with two power switching devices

10.3.1.1

Evaluation of two 3WL circuit breakers connected in series

Result, 3WL circuit breaker K
Result
PL
PFH
D
Average probability of a dangerous
failure per hour
Determination of the PL of the power supply
Parameter
MTTF
D
of each channel
DC
Measures against CCF
Category
Calculation of MTTF 3WL circuit breaker
D
Parameter
B10
B10 value 3WL circuit breaker
Percentage of dangerous failures
EMERGENCY STOP command device
d
op
average operating time in days per year
h
op
average operating time in hours per day
t
cycle
average time between the start of two con-
secutive cycles of the component
58
redundant
AH[n]
d
1.01 E-07
Value
High
Low
Fulfilled
3
Value
7.5 * 10
0.5 (50 %)
365 days per year
24 hours per day
24 hours per cycle
Reason
The values for determination are listed in the following ta-
bles.
Reason
MTTF > 30 years (410.95 years)
D
DC = 60%
It is assumed that the user has taken the necessary
measures.
System response: One single failure does not result in the
loss of the safety function. Several, however not all faults
are detected.
Reason
Manufacturers data
3
Manufacturers data
Assumption:
The device can be actuated every
day of the year
Assumption:
there is one day between actuat-
ing the EMERGENCY STOP (test-
ing the EMERGENCY STOP)
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
Definition
SIEMENS AG
User