Pepperl+Fuchs KFD2-SH-Ex1 - 8 List of Abbreviations

2017-04
24
Functional Safety KFD2-SH-Ex1(.T)(.OP), KHA6-SH-Ex1
List of Abbreviations
8 List of Abbreviations
B
10d
Number of switching cycles of relays until 10 % of these
components have failed
Category Category acc. to EN/ISO 13849-1
DC
d
Diagnostic Coverage of dangerous faults
DCS Distributed Control System
ESD Emergency Shutdown
FIT Failure In Time in 10
-9
1/h
FMEDA Failure Mode, Effects and Diagnostics Analysis

s
Probability of safe failure

dd
Probability of dangerous detected failure

du
Probability of dangerous undetected failure

no effect
Probability of failures of components in the safety path that have
no effect on the safety function

not part
Probability of failures of components that are not in the safety path

total (safety function)
Safety function
HFT Hardware Fault Tolerance
MTBF Mean Time Between Failures
MTTF
d
Mean Time To dangerous Failures
MTTR Mean Time To Repair
PFD
avg
Average Probability of Failure on Demand
PFH Probability of dangerous Failure per Hour
PL Performance Level acc. to EN/ISO 13849-1
PTC Proof Test Coverage
SFF Safe Failure Fraction
SIF Safety Instrumented Function
SIL Safety Integrity Level
SIS Safety Instrumented System
T
1
Proof Test Interval
FLT Fault
LB Lead Breakage
LFD Line Fault Detection
SC Short Circuit
Original InstructionsFunctional Safety KFD2-SH-Ex1(.T)(.OP), KHA6-SH-Ex1