Configuration and Connection Examples 12.2010
6SE7087-6QX70 (Version AM) Siemens AG
2-46 Compendium Motion Control SIMOVERT MASTERDRIVES
The protective door is monitored by two independent position switches
–S4 and –S5. Each of these position switches is equipped with a
positive opening contact.
Parameter Value Comment
Position switches –S4 and –S5
B10 value 10.000.000 Specified by manufacturer
Share of hazardous
failures
20 % Specified by manufacturer
B10
d
value 50.000.000
failures hazardous of share
10B
10B
d
=
nop 24960 per year Assumed actuations per year
MTTF
d
20,032 years
Capped to 100 years
op
d
d
n1,0
10B
MTTF
×
=
DC 99 % Plausibility monitoring by –A2
Interim results for ACQUIRE (channels 1 and 2)
MTTF
d
(ACQUIRE)
100 years
→
High
MTTF
d
values of both channels have been
capped to 100 years →
It is not necessary to symmetrize both
channels.
DC
avg
99 % → High
(channel2) DC (channel1) DCDC
avg
==
Result
PFH
d
2.47 x 10
-8
/ h EN ISO 13849-1:2008 Appendix K
Performance Level PLe with Category 4
Subsystem
ACQUIRE
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