16. Accessories
Background lighting can degrade the visibility of the warning signal. A blind can be mounted in the interior of the
light to reduce the transparency of the lens and block background light, thus achieving better contrast levels for
the warning signal. Two installation positions, set off at 90° from one another, are included for optional blocking
of lateral light.
The blind must be ordered as a separate accessory.
Illustration 9 - Blind
17. List of Abbreviations
DC
Diagnostic Coverage
DIP
Dual Inline Package
LED
Light Emitting Diode
MTTF(d)
Mean Time To Failure (dangerous)
NC
Normally Close (contact)
NO
Normally Open (contact)
PFD
Probability Failure per Demand
PFH
Probability Failure per Hour
PL
Performance Level
PWM
Pulse-Width Modulation
SFF
Safety Failure Fraction
SIL
Safety Integrated Level
T1
Interval for repeat testing
WEEE
Waste of Electrical and Electronic Equipment
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30401 – 004-2
