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Operation Manual Safety I/O Terminals SI4000 / SO4000
Document no.: 5.08009.05
APPENDIX A - ABBREVIATIONS
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
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