Siemens Simovert Masterdrives Compendium page 57

12.2010
Subsystem
ACQUIRE
Parameter
Emergency Stop button –S3
B10 value
Share of hazardous
failures
B10 value
d
nop
MTTF
d
DC
Result
PFH
d
Performance Level
Subsystem
EVALUATE
Parameter
Safety switching device 3TK2820 –A1
PFH
d
Service life
Performance Level
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES
The safety function is triggered by the Emergency Stop button with
rotary unlocking mechanism which is connected in two channels. This
has positive opening contacts.
Fault exclusion is assumed in each case for the positive opening
contacts and the mechanical components of the Emergency Stop
button. Accumulation of faults between two consecutive actuations of
the Emergency Stop button can result in loss of the safety function.
This behavior corresponds to Category 3.
Value
100.000
20 %
500.000
12 per year
416,666 years
→ high
99 %
-8
4.29 x 10 / h
PLe
In this example, the subsystem EVALUATE is provided by a SIRIUS
3TK3820 safety switching device. The safety switching device features
instantaneous electronic enabling circuits.
Value
-10
9.4 x 10 / h
T1 = 20 years
PLe
Compendium Motion Control
Configuration and Connection Examples
Comment
Specified by manufacturer
Specified by manufacturer
B10
=
B 10
d
share of hazardous
Assumed actuations per year
B 10
d
MTTF =
d
0 1 , × n
op
Plausibility monitoring by –A1
EN ISO 13849-1:2008 Appendix K
with Category 3
Comment
Specified by manufacturer
Specified by manufacturer
with Category 4
failures
2-29