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Table 2: Summary for IM33-**(Ex)-Hi/24VDC – Failure rates
Fail-safe state = "fail high"
Failure Category
λ
= λ
low
sd
λ
= λ
high
dd
λ
= λ
low
dd
λ
= λ
high
sd
Fail-safe state = "fail low"
Failure Category
λ
= λ
low
sd
λ
= λ
high
dd
λ
= λ
low
dd
λ
= λ
high
sd
Table 3: Summary for IM33-**(Ex)-Hi/24VDC – PFD
T[Proof] = 1 year
PFD
= 1,92E-04
AVG
Table 4: Summary for IM35-**Ex-Hi/24VDC – Failure rates
λ λ λ λ
safe
583 FIT
Table 5: Summary for IM35-**Ex-Hi/24VDC – PFD
T[Proof] = 1 year
PFD
= 4,50E-04
AVG
The boxes marked in yellow (
allowed range for SIL 2 according to table 2 of IEC 61508-1 but do not fulfill the requirement to
not claim more than 10% of this range, i.e. to be better than or equal to 1,00E-03. The boxes
marked in green (
SIL 2 according to table 2 of IEC 61508-1 and table 3.1 of ANSI/ISA–84.01–1996 and do fulfill
the requirement to not claim more than 10% of this range, i.e. to be better than or equal to
1,00E-03.
Because the Safe Failure Fraction (SFF) is above 60%, also the architectural constraints
requirements of table 2 of IEC 61508-2 for Type A subsystems with a Hardware Fault
Tolerance (HFT) of 0 are fulfilled.
2
DC means the diagnostic coverage (safe or dangerous) of the safety logic solver for the Isolating
Transducers IM33-**Ex-Hi/24VDC.
exida.com
©
GmbH
Stephan Aschenbrenner
more@turck.com • www.turck.com • 2015/04
Anhang – EXIDA-Report FMEDA Turck 04/07-14 R001
λ λ λ λ
λ λ λ λ
λ λ λ λ
sd
su
233 FIT
315 FIT
73 FIT
73 FIT
315 FIT
233 FIT
λ λ λ λ
λ λ λ λ
λ λ λ λ
sd
su
239 FIT
315 FIT
67 FIT
67 FIT
315 FIT
239 FIT
T[Proof] = 5 years
PFD
= 9,60E-04
AVG
λ λ λ λ
dangerous
103 FIT
T[Proof] = 5 years
PFD
= 2,25E-03
AVG
) mean that the calculated PFD
) mean that the calculated PFD
SFF
λ λ λ λ
dd
du
44 FIT
93%
44 FIT
93%
SFF
λ λ λ λ
dd
du
44 FIT
93%
44 FIT
93%
values
AVG
T[Proof] = 10 years
PFD
values
AVG
T[Proof] = 10 years
PFD
AVG
values are within the allowed range for
AVG
TURCK 04-07-14 R001 V2R0.doc; February 8, 2013
2
DC
DC
²
S
D
42%
62%
18%
84%
DC
²
DC
²
S
D
43%
60%
17%
84%
= 1,92E-03
AVG
SFF
85%
= 4,48E-03
AVG
values are within the
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