Evaluating the safety functions according to EN ISO 13849 when using two switching devices
10.1 Evaluation of "Detect"
Application document for functional safety STO, SS1 (ISO 13849-1)
56 Compact User Manual, 09/2016, A5E34871844AM
e The values for determination are listed in the following ta-
Average probability of a dangerous failure
per hour
9.06E-10
Determination of the PL of the EMERGENCY STOP command device
High MTTF
D
≥ 2500 years (13,698.63 years)
Crosswise comparison of F-DI
Fulfilled It is assumed that the user has taken the necessary
4 System response: One single failure does not result in the
loss of the safety function. A single fault is detected.
: High, DC: High, measures against CCF: Fulfilled
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
op
average operating time in days per year
365 days per year Assumption:
The device can be actuated every
day of the year
User
average operating time in hours per day
cycle
average time between the start of two
consecutive cycles of the component
24 hours per cycle Assumption:
there is one day between actuating
(testing the EMERGENCY STOP)
To Next Page
Loading...
