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Abreviaturas
OPTISWITCH 5300C • Dos hilos (8/16 mA)
9 Anexo B - Definiciones de conceptos
SIL
Safety Integrity Level (SIL1, SIL2, SIL3, SIL4)
SC
Systematic Capability (SC1, SC2, SC3, SC4)
HFT
Hardware Fault Tolerance
SFF
Safe Failure Fraction
PFD
Average Probability of dangerous Failure on Demand
AVG
PFH
Average frequency of a dangerous failure per hour (Ed.2)
FMEDA Failure Mode, Effects and Diagnostics Analysis
FIT
Failure In Time (1 FIT = 1 failure/10
λ
Rate for safe detected failure
SD
λ
Rate for safe undetected failure
SU
λ
λ
= λ
+ λ
S
S
SD
SU
λ
Rate for dangerous detected failure
DD
λ
Rate for dangerous undetected failure
DU
λ
Rate for failure, who causes a high output current (> 21 mA)
H
λ
Rate for failure, who causes a low output current (≤ 3.6 mA)
L
λ
Rate for diagnostic failure (detected)
AD
λ
Rate for diagnostic failure (undetected)
AU
DC
Diagnostic Coverage
PTC
Proof Test Coverage
T1
Proof Test Interval
LT
Useful Life Time
MTBF
Mean Time Between Failure
MTTF
Mean Time To Failure
MTTR
Mean Time To Restoration (Ed.2)
MTTF
Mean Time To dangerous Failure (ISO 13849-1)
d
PL
Performance Level (ISO 13849-1)
9 Anexo B - Definiciones de conceptos
h)
9
15
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