18
Safety Figures
Safety Manual
MN042004EN March 2017 www.eaton.com
ote:
N
All failure rate data in tables below are in FPMH
(Failures per million hours)
Symbol
C445BD-XALM
C445BD-XANM
C445BD-XALN
C445BD-XANN
C445BD-XDLM
C445BD-XDNM
C445BD-XDLN
C445BD-XDNN
C445BA-XDLM
C445BA-XDNM
C445BA-XDLN
C445BA-XANM
C445BA-XALN
Safety Integrity Level
SIL
1
1
1
1
Hardware Fault Tolerance
HFT
0
0
0
0
Failure rate for detected
safe failures
ʎ
SD
(1)
0.229285
0.364605
0.276269
0.210949
Failure rate for
undetected safe failures
ʎ
SU
(2)
1.326801
1.394441
1.597322
1.529682
Failure rate for detected
dangerous failures
ʎ
DD
(3)
0.000423
0.000426
0.000426
0.000426
Failure rate for undetect-
ed dangerous failures
ʎ
DU
(4)
0.751464
0.770906
0.770906
0.751464
Safe Failure Fraction
SFF
68.4%
69.5%
70.9%
69.9%
Mean Time Before Failure
MTBF
198683
192269
187112
193181
Average probability of
failure on demand
PFD
AVG
7.519 X 10
-07
7.713 X 10
-07
7.713 X 10
-07
7.519 X 10
-07
Architecture
1oo1
1oo1
1oo1
1oo1
Lifetime
20 Yrs
20 Yrs
20 Yrs
20 Yrs
Proof Test Interval
1 Yr
1 Yr
1 Yr
1 Yr
Systematic capability
1
1
1
1