Pepperl+Fuchs HiC2821, Safety Manual

Page: 16 / 20

2
014-
09
16
Safety Manual SIL KCD2-SR-(Ex)*(.LB)(.SP), HiC282*
Abbreviations
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
ERR Error
LB L ead B reakage
LFD L ine F ault D etection
SC S hort C ircuit
Safety Manual SIL KCD2-SR-(Ex)*(.LB)(.SP), HiC282*