67
Instruction handbook
Safe STO logic
BM5-SSL
Document No. 5.18007.02
A
PPENDIX
A - A
BBREVIATIONS
DC
Diagnostic Coverage
EMC
Electromagnetic compatibility
EN
European standard
ESD
Electrostatic sensitive device
EXT, ext
External
I/O
Input/Output
ISO
International Organization for
Standardization
LED
Light-emitting diode
MTTF
d
Mean Time To Failure
PFD
Probability of Failure on Demand
(mean residual error probability of
a dangerous error on demand)
PFH
Probability of Failure per Hour
SIL
Safety Integrity Level
SFF
Safe Failure Fraction (fraction of
failures which lead to safe status)
STO
Safe Torque Off
Summary of Contents for BM5-SSL
Page 79: ......