Siemens SINAMICS DCM - Evaluation of Detect

Evaluating the safety functions according to EN ISO 13849 when using one switching device
9.1 Evaluation of "Detect"
Application document for functional safety STO, SS1 (ISO 13849-1)
48 Compact User Manual, 09/2016, A5E34871844AM
9.1
Evaluation of "Detect"
Result für EMERGENCY STOP command devices
Result
Reason
PL
e The values for determination are listed in the following ta-
bles.
PFH
D
Average probability of a dangerous failure
per hour
9.06E-10
Determination of the PL
Parameter
Value
Reason
MTTF
D
of each channel
High MTTF
D
≥ 2500 years (13,698.63 years)
DC
High DC = 99 %
Crosswise comparison of F-DI
Measures against CCF
Fulfilled It is assumed that the user has taken the necessary
measures.
Category
4 System response: One single failure does not result in the
loss of the safety function. A single fault is detected.
MTTF
D
: High, DC: High, measures against CCF: Fulfilled
Calculation of MTTF
D
Parameter
Value
Reason
Definition
B10
B10 value EMERGENCY STOP
command device
1 * 10
5
Manufacturers data SIEMENS AG
Percentage of dangerous failures
EMERGENCY STOP command
device
0.2 (20 %) Manufacturers data
d
op
average operating time in days per
year
365 days per year Assumption:
The device can be actuated every
day of the year
User
h
op
average operating time in hours
per day
24 hours per day
t
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 EMERGENCY STOP)