63
Operation Manual
Safety I/O Terminals
SI4000 / SO4000
Document no.: 5.08009.05
A
PPENDIX
A - A
BBREVIATIONS
CPU
Central Processing Unit
DC
Diagnostic Coverage
Diag
Diagnostic LED
DIN
Deutsches Institut für Normung
e.V.
EMC
Electromagnetic compatibility
EN
European standard
FSoE
Safety protocol „Safety over Ether-
CAT“
HFT
Hardware Failure Tolerance
I/O
Input/Output
I/O bus
Bus between b maXX safe PLC
and the modules right of the PLC
and/or power supply
LED
Light-emitting diode
MTTF
d
Mean Time To Failure
PFD
Probability of Failure on Demand
PFH
Probability of Failure per Hour
PLC
Process loop control, stored Pro-
gram Control, SPS
RAM
Random Access Memory
ROM
Read Only Memory
SFF
Safe Failure Fraction (Fraction of
failures which lead to safe status)
SIL
Safety Integrity Level
SW
Software
Summary of Contents for SI4000
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