
b
1
c
1
d
2
e
3
Table 3 (EN ISO 13849-1) - Performance Level (PL)
Performance Level (PL)
Average probability of a dangerous
breakdown per hour 1/h
a
≥
10
-5
to < 10
-4
b
≥
3 x 10
-6
to < 10
-5
c
≥
10
-6
to < 3 x 10
-6
d
≥
10
-7
to < 10
-6
e
≥
10
-8
to < 10
-7
1.7.4
Abbreviations
Abbreviation
Term
B
10d
-
MTTF
d
Mean Time to Dangerous Failure
DC
Diagnostic Coverage
PL
Performance Level
PFH
Probability of Failure per Hour
SIL
Safety Integrity Level
Introduction
© KEBA 2009
User's Manual V1.50
15