Evaluation Of "Detect - Siemens SINAMICS DCM User Manual

Evaluation of the safety function according to EN 62061

11.1 Evaluation of "Detect"

11.1 Evaluation of "Detect"
Result
Result
SILCL
SIL claim limit
PFH
D
Average probability of a dangerous
failure per hour
Values to calculate the PFH
Parameter
B10
B10 value EMERGENCY STOP
command device
Percentage of dangerous failures
EMERGENCY STOP command
device
T1
service life
C
Number of times that the
EMERGENCY STOP command
device is actuated
T2
Diagnostic test interval
CCF factor (β)
susceptibility to common-cause
failures
DC
Diagnostic Coverage
64
3
8.33 E-10
D
Value
1 * 10
5
0.2 (20 %)
175200 h
1 / 24 h
24 h
0.1 (10 %)
0.99 (99 %)
Reason
Safe failure fraction ≥ 99 %
Hardware fault tolerance HFT=1
2-channel architecture with identical partial systems
Reason
Manufacturers data
Manufacturers data
Expected service life, 20 years
Assumption:
The device is actuated once a day
The device can be actuated every
day of the year
It is actuated once per day. A de-
fective contact is detected
When installed according to
EN 62061, this can assumed to be
a "conservative value"
Cross comparison in the switching
device
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
Definition
SIEMENS AG
User