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Assessment of Functional Safety
This Beacon is intended for use in a safety system conforming to the requirements of IEC61508.
Sira Test & certification Ltd has conducted a Failure Modes Effect and Diagnostic Analysis (FMEDA) of the LD15
Xenon Beacon against the requirements of IEC 61508-2 using a Proof Test Interval of 8760hrs.
The results are shown below and are based on Route 1H.
The Beacon is classed as a Type B device
Safety Function:
'To provide an intermittent or permanent spherical visual warning light upon demand'.
Summary of Clauses
2/7.4.2 and 2/7.4.4
Architectural constraints
Safe Failure Fraction (SFF)
Random hardware
-1
failures: [h
]
Random hardware
-1
failures: [h
]
Diagnostic coverage (DC)
PFD @ PTI = 8760Hrs
MTTR = 8 Hrs
Average freq. of dangerous failure
-1
(high demand-PFH)[h
]
Hardware safety integrity
[
compliance
Systematic safety integrity
compliance
Systematic Capability
(SC1, SC2, SC3, SC4)
Hardware safety integrity achieved
© MEDC 2015
LD15 LED Beacon
Single Mode (1oo1)
HFT=0
60%
0.00E+00
!
DD
3.44E-08
!
DU
!
0.00E+00
SD
!
5.16E-08
SU
0.00%
1.51E-04
3.44E-08
Limited to: SIL 1 (1oo1) & SIL 2 (1oo2) due to SFF value.
LD15 LED Beacon
Redundant Mode (1oo2)
HFT=1
60%
0.00E+00
3.45E-09
0.00E+00
5.19E-09
0.00%
1.51E-05
3.45E-09
Route 1
H
See report R56A31253B
SC2 (R56A31253B)
Verdict
Type B
SIL 1
!
!
!
!
SIL 3
SIL 3
!
01/15
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