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A
Assessment of Functional Safety – XB15 AC
s
s
e
s
s
m
e
nt
of f F
F
u
nc
T
This Beacon is intended for use in a safety system conforming to the requirements of IEC61508.
i h
s B
e
a
co
n
i
s i
n
te
n
d
UL has conducted a Failure Modes Effect and Diagnostic Analysis (FMEDA) of the XB15 Xenon
U
L has
c
o
nd
uc
t
ed
a F
Be
Beacon against the requirements of IEC 61508-2 using a Proof Test Interval of 8760hrs.
ac
on
ag
ains
t t
he r
eq
The results are shown below and are based on Route 1
T
h
e res
ult
s
ar
e s
ho
w
n b
The Beacon is classed as a Type B device.
T
h
e B
eac
on is
c
las
s
ed as
S
Safety Function:
a
e f
y t
F
unc
i t
on:
'To provide a spherical cycled visual warning light when energized'.
'
To
S
Summary of Clauses
u
m
m
r a
y o
f
2/7.4.2 and 2/7.4.4
2/
7.
4.
2
an
d
A
Architectural constraints
A
c r
c r
h
h
t i
t i
ec
ec
u t
u t
ra
ra
c l
c l
ons
ons
Safe Failure Fraction (SFF)
S
a
fe
e F
l ai
ure F
r
ac
Random hardware
Random
hard
w
are
-1
-1
1
failures: [h
a f
ilu
e r
: s
h [
]
]
Random
Random hardware
hard
w
are
-1
-1
1
failures: [h
a f
ilu
e r
: s
h [
]
]
Di
Diagnostic coverage (DC)
agnos
c i t
c
o
v
e
rage
(DC)
PFD @ PTI = 8760Hrs, MTTR = 8 Hrs
P
F
D
@
P
I T
=
87
60Hrs,
Average freq. of dangerous failure
A
v
erage
f
e r
. q
of
da
ngerous
-1
-1
(high demand-PFH)[h
(hi
gh d
e
m
a
nd-P
F
H
)[
h
H
Hardware safety integrity compliance
a
d r
w
a
e r
s
a
fe
ty
n i
te
r g
Sy
Systematic safety integrity compliance
Sy
s
s
te
te
m
m
a
a
c ti
c ti
s
s
a
a
fe
fe
ty
ty
n i
n i
te
te
Systematic Capability
S
s y
y
e t
m
a
c i t
C
apabi
p
l
y t i
(SC
(SC1, SC2, SC3, SC4)
(S 1,
C
SC2,
SC
SC3,
SC
SC
SC4)
C
4)
Hardware s
Hardware safety integrity achieved
f a
t e
i y
t n
egri
03/16
t
o i
n
l a
S
a
e f
y t
–
X
B
1
5
e
d
fo
r o
u
se
n i
a
sa
fe
ty syste
ail
ur
re
M
od
es
Ef
f
ec
t
an
uir
e
e
m
e
nt
s
of
E I
C
61
elo
o
w
and
are
bas
ed o
a
T
y
pe B
dev
ic
. e
o pr ro
o
vi
i i d
de
e
a s
p
h
e
i i c r r i
a c
c l l c
c y y c
C
a l
u
ses
s
X
XB15 Xenon Beacon
B
15
2
7 /
4 .
4.
4
S
Single Mode (1oo1)
i i ng
ng
t
t
a r
a r
ai
ai
n
n
s t
s t
i t
on
S (
F
) F
DD
D
D
D
DU
U
SD
SD
D
SU
SU
U
M
T
T
T
R
=
8
Hrs
s
f
l i a
ure
]
]
ty i
c
o
o
m
p
a i l
n
c
e
r g
r g
ty i
ty i
c
c
c
c
o
o
m
m
p
p
a i l
a i l
n
n
c
c
e
e
Limited to: SIL 1 (1oo1) & SIL 2 (1oo2) due to SFF value.
i L
m
i
y t
ac
c
hi
ev
ed
A
C
m co
n
fo
r
m
n i
g
to
d
D
ia
gnos
ic t
A
na
ly
l
s
is
50
8-
2 us
in
g a Pr
oo
of
T
n
R
out
e 1
H.
H.
e l l e
d v i
s i i s
u
al l wa
wa
rn
n i
g
li
i i gh
gh
t h
wh
XB15 AC Beacon
X
B
15
A
C
B
B
eac
X
e
non
B
eac
on
XB
XB15 Xenon Beacon
e l l e
M
o
de
(1
oo1)
Redundant Mode (1oo2)
Re
edundan
HFT=0
H
FT=0
72%
72%
6.
6.45E-09
45
- E
09
3.48E-07
3.
48
- E
07
0.
0.00E+00
00
E
+
0
0
8.84E-07
8.
84
- E
07
0.
0.00%
00
%
1.
1.53E-03
53
- E
03
3.48E-07
3.48E
0 -
7
Route 1
Rout
Rout
Route 1
Rout
e t
d
t
: o
SI
L
1 (
1
o
o
1
1)
& S
th
e
e r
q
i u
e r
me
n
ts o
f IE
F (
M
E
D
A) of
h t
e X
B1
es
I t
nt
erv
al of
8
76
0hrs
hen
en
e
r r gi
gi i z
e z
. ' d
on
1
5
X
e
n
o
n
Be
a
c
o
n
t t M
M
o
de
(1
oo2)
H
HFT=1
FT=1
SIL 1 (1oo1)
SI
72%
72%
I S
SIL 2 (1oo2)
6.
6.45E-10
45
- E
10
3.
3.48E-08
48
- E
08
0.00E+00
0.
00
E
+
0
0
8.
8.84E-08
84
- E
08
0.00%
0.
00
%
1.
1.53E-04
53
- E
04
SIL 2 (1oo1)
SI
3.
3.48E-08
48
- E
08
SIL 3 (1oo1)
SI
e
1
H
H
e
e
1
1
S
S
SC
SC2
2
I
L
2 (
1
oo
2)
d
u
e
t
o
C6
1
5
0
. 8
5 Xe
no
n
.
Ve
Verdict
d r
ic
t
Type B
Ty
pe
B
L
1
1 (
o
o
) 1
L 2
1 (
oo2
)
L
2
1 (
o
o
) 1
L
3
1 (
o
o
) 1
S
F
F
v
a
u l
. e
© MEDC 2016
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