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

Assessment of functional safety – LD15 AC
This Beacon is intended for use in a safety system
conforming to the requirements of IEC61508. UL 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.
'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
λ
hardware
failures: [h ]
-1
λ
Random
λ
hardware
failures: [h ]
-1
Diagnostic coverage
(DC)
PFD @ PTI = 8760Hrs,
MTTR = 8 Hrs
Average freq. of
dangerous failure
(high demand-PFH)[h
Hardware safety
integrity compliance
Systematic safety
integrity compliance
Systematic Capability
(SC1, SC2, SC3, SC4)
Hardware safety
integrity achieved
LED BEacon LD15 TM253 Issue F October 2019 www.eaton.com
Safety function:
LD15 DC Beacon
LD15 LED Beacon LD15 LED Beacon
Single Mode Redundant Mode
(1oo1) (1oo2)
HFT=0 HFT=1
67% 67%
6.45E-09 6.45E-10
DD
6.247E-08 6.247E-09
DU
0.00E+00 0.00E+00
SD
1.21E-07 1.21E-08
SU
0.00% 0.00%
2.74E-04 2.742E-05
6.247E-08 6.247E-09
]
-1
Route 1
Route 1
SC2
Limited to: SIL 1 (1oo1) & SIL 2 (1oo2) due to
SFF value.
LED Beacon LD15
English
Verdict
Type B
SIL 1
(1oo1)
SIL 2
(1oo2)
SIL 3
(1oo1)
SIL 4
(1oo1)
H
S
7