9
2.3.1 Perpendicular Approach to the Safety Field
Direction of
Approach
Installation Height 750 mm
A minimum installation height of 750 mm
from the reference level is required for the
use of a light barrier
C = Margin for penetration into the dan-
ger zone before the safety device is
tripped (never < 0) = 1200 mm
K = 1600 mm per second
S = K×(t1+t2)+C(1200 mm)
Direction of
Approach
If more than one light barrier is used, the
table included below applies.
C = Margin for penetration into the dan-
ger zone before the safety device is
tripped (never < 0) = 850 mm
K = 1600 mm per second
S = K×(t1+t2)+C(850 mm)
The number of utilized light barriers is based upon EN ISO 13855 in consideration of the relevant level C
standard.
Number of
Light Barriers
Installation Height in mm Above the Reference Level
Barrier 1
Barrier 2
Barrier 3
Barrier 4
1
750
2
400
900
3
300
700
1100
4
300
600
900
1200
