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6 Terms and Definitions
DC
S
DC
D
FIT
FMEDA
HART
HFT
Low demand mode
PFD
AVG
SFF
SIF
SIL
Type A component
T[Proof]
exida.com
©
GmbH
Stephan Aschenbrenner
more@turck.com • www.turck.com • 2015/04
Anhang – EXIDA-Report FMEDA Turck 04/07-14 R001
Diagnostic Coverage of safe failures (DC
Diagnostic Coverage of dangerous failures (DC
-9
Failure In Time (1x10
failures per hour)
Failure Modes, Effects, and Diagnostic Analysis
Highway Addressable Remote Transducer
Hardware Fault Tolerance
Mode, where the frequency of demands for operation made on a safety-
related system is no greater than one per year and no greater than twice
the proof test frequency.
Average Probability of Failure on Demand
Safe Failure Fraction summarizes the fraction of failures, which lead to a
safe state and the fraction of failures which will be detected by
diagnostic measures and lead to a defined safety action.
Safety Instrumented Function
Safety Integrity Level
"Non-complex" component (all failure modes are well defined); for
details see 7.4.3.1.2 of IEC 61508-2.
Proof Test Interval
= λ
/ (λ
+ λ
S
sd
sd
= λ
/ (λ
D
dd
TURCK 04-07-14 R001 V2R0.doc; February 8, 2013
)
su
+ λ
)
dd
du
Page 19 of 25
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