© Eaton MEDC Ltd 2017
07/17
DB1H SOUNDER
Safety Function of DB1H Sounder:
To provide a pre-described audible warning sound when required
’
Summary of Clauses
2/7.4.2
and 2/7.4.4
DB1H Sounder
Single Mode (1oo1)
DB1H Sounder
Redundant Mode (1oo2)
Verdict
HFT=0
HFT=1
Type B
Architectural constraints
Safe Failure Fraction (SFF)
65%
65%
SIL 1(1oo1)
SIL 2 (1oo2)
Random hardware
failures:
[h
-1
]
!
DD
!
DU
6.45E+09
8.87E-08
6.45E+10
8.87E-09
Random hardware
failures:
[h
-1
]
!
SD
!
SU
0.00E+00
1.59E-07
0.00E+00
1.59E-08
PFD @ PTI = 8760Hrs
MTTR = 8 Hrs
3.89E-04
3.89E-05
SIL 3(1oo1)
Average freq. of dangerous failure (high
demand-PFH)[h
-1
]
8.86E-08
8.86E-09
SIL 3(1oo1)
Hardware safety integrity
compliance
Route 1
H
Systematic safety integrity
compliance
Route 1
s
Systematic Capability
(SC1, SC2, SC3, SC4)
SC2
Hardware safety integrity achieved
Limited to: SIL 1 (1oo1) & SIL 2 (1oo2) due to SFF value.
