11
Sounder - dB3B
TM264 July 2020 www.eaton.com
Sounder - DB3B
English
DB3B Sounder
Safety Function of DB3B Sounder:
To provide a pre-described audible warning sound when required
Summary of Clauses
2/7.4.2 and 2/7.4.4
DB3B Sounder
Single Mode (1oo1)
DB3B Sounder
Redundant Mode (1oo2)
Verdict
Architectural constraints
Safe Failure Fraction (SFF)
HFT=0
HFT=1
Type B
65.9%
65.9%
SIL 1(1oo1)
SIL 2 (1oo2)
Random hardware
failures: [h-
1
]
λ
DD
λ
DU
6.5E+09
1.16E-07
6.5E+10
1.16E-08
Random hardware
failures: [h-
1
]
λ
SD
λ
SU
0.00E+00
2.18E-07
0.00E+00
2.18E-08
PFD @ PTI = 8760Hrs MTTR = 8 Hrs
5.09E-04
5.09E-05
SIL 3(1oo1)
Average freq. of dangerous failure (high
demand-PFH)[h-
1
]
1.16E-07
1.16E-08
SIL 2(1 oo1)
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.
