Pepperl+Fuchs SIL KFD0-RSH-1, Руководство по безопасности

Страница: 17 / 20

Safety Manual SIL KFD0-RSH-1(-Y2), KFD2-SL-4
Abbreviations
2
014-07
17
5 Abbreviations
DCS D istributed C ontrol S ystem
ESD E mergency S hut d own
FIT F ailure I n T ime in 10
-9
1/h
FMEDA F ailure M ode, E ffects and D iagnostics A nalysis

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 failure of components that are not in the safety path

total (safety function)
Safety function
HFT H ardware F ault T olerance
MTBF M ean T ime B etween F ailures
MTTR M ean T ime T o R epair
PFD
avg
Average P robability of F ailure on D emand
PFH P robability of dangerous F ailure per H our
PTC P roof T est C overage
SFF S afe F ailure F raction
SIF S afety I nstrumented F unction
SIL S afety I ntegrity L evel
SIS S afety I nstrumented S ystem
T
proof
Proof Test Interval
DPS D ual P ole S witching
DTS D e-energized T o S afe State
ETS E nergized T o S afe State
Safety Manual SIL KFD0-RSH-1(-Y2), KFD2-SL-4