Assessment Of Functional Safety - Ld15 Dc - Eaton LED Beacon LD15 Technische Anleitung

LED Beacon LD15
English
Assessment of functional safety – LD15 DC
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 LED 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 1
The Beacon is classed as a Type B device.
6
LED BEacon LD15 TM253 Issue F October 2019 www.eaton.com
'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)
.
H
λ
Random
DD
λ
hardware
DU
failures: [h ]
-1
λ
Random
SD
λ
hardware
SU
failures: [h ]
-1
Diagnostic coverage
(DC)
PFD @ PTI = 8760Hrs,
MTTR = 8 Hrs
Average freq. of
dangerous failure
(high demand-PFH)[h ]
-1
Hardware safety
integrity compliance
Systematic safety
integrity compliance
Systematic Capability
(SC1, SC2, SC3, SC4)
Hardware safety
integrity achieved
Safety function:
LD15 DC Beacon
LD15 LED Beacon LD15 LED Beacon
Single Mode Redundant Mode
(1oo1) (1oo2)
HFT=0 HFT=1
60% 60%
0.00E+00 0.00E+00
3.44E-08 3.45E-09
0.00E+00 0.00E+00
5.16E-08 5.19E-09
0.00% 0.00%
1.51E-04 1.51E-05
3.44E-08 3.45E-09
Route 1
H
See report R56A31253B
SC2 (R56A31253B)
Limited to: SIL 1 (1oo1) & SIL 2 (1oo2) due to
SFF value.
Verdict
Type B
SIL 1
(1oo1)
SIL 2
(1oo2)
SIL 3
(1oo1)