Boxes above a certain size should be detected (large or larger than shown in the figure).
The light grid is mounted from below (connection side down). The objects travel, for
example, on a conveyor belt between the light grid.
LBB ≥ 10:
If within zone 2 the last interrupted beam is 10 or greater, internal switching signal Q
int
2
is activated.
19
20
17
18
15
16
13
14
11
12
9
10
7
8
5
6
3
4
1
2
Zone 2 (LBB)
Figure 23: Height measurement with LBB, example 4
If a box is smaller than shown in the graphic, the first interrupted light beam is < 10
and the internal switching signal Q
int
2 remains deactivated.
Example 5 position determination with FBB:
The position of a box on a conveyor belt is to be detected. The light grids are mounted
along a conveyor belt with the connection side on the left. The box moves from right to
left. As soon as the box is in the position of the 10th light beam, the light grid switches.
FBB = 10:
If beam 10 is interrupted within zone 4, internal switching signal Q
int
2 is activated.
19
20
17
18
15
16
13
14
11
12
9
10
7
8
5
6
3
4
1
2
Zone 4 (FBB)
Figure 24: Position determination with FBB, example 5
Example 6 position determination with LBB:
OPERATION
7
8026014/2021-06-10 | SICK O P E R A T I N G I N S T R U C T I O N S | SLG-2
33
Subject to change without notice
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