Evaluation Of "Detect - Siemens SINAMICS DCM User Manual

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

10.1 Evaluation of "Detect"

10.1 Evaluation of "Detect"
Result
Result
PL
PFH
D
Average probability of a dangerous failure
per hour
Determination of the PL of the EMERGENCY STOP command device
Parameter
MTTF
D
of each channel
DC
Measures against CCF
Category
Calculation of MTTF
D
Parameter
B10
B10 value EMERGENCY STOP command
device
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
consecutive cycles of the component
56
Reason
e The values for determination are listed in the following ta-
bles.
9.06E-10
Value Reason
High MTTF
High DC = 99 %
Crosswise comparison of F-DI
Fulfilled It is assumed that the user has taken the necessary
measures.
4 System response: One single failure does not result in the
loss of the safety function. A single fault is detected.
MTTF
Value
1 * 10
5
0.2 (20 %)
365 days per year
24 hours per day
24 hours per cycle
≥ 2500 years (13,698.63 years)
D
: High, DC: High, measures against CCF: Fulfilled
D
Reason
Manufacturers data
Manufacturers data
Assumption:
The device can be actuated every
day of the year
Assumption:
there is one day between actuating
the EMERGENCY STOP
(testing the EMERGENCY STOP)
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
Definition
SIEMENS AG
User