Chapter
6
Operating Instructions
CLV 490 Bar Code Scanner
6-10
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 009 993/O824/20-12-2004
Operation
Irrespective of the type of focus control, the reading area defines the area along the scan
line in which the CLV always evaluates bar codes. In combination with the multiple focus
position switchover/autofocus, this produces a vertical plane relative to the CLV (or a tunnel
in the case of object tracking in conveyor mode). During evaluation, the CLV rejects any bar
codes detected outside the defined area.
Condition: reading from above with line scanner
•
CP limits
:
Simple delimitation of the reading area (circle segment) by restricting the active scan
angle range without reference to a point of origin (
). The scan angle range is
max.
±
30
°
for a line scanner and max.
±
25
°
for a line scanner with oscillating mirror.
•
Reading space
:
Sharp delimitation of the active reading area by defining the area through which the
object must pass in the circle segment. This produces a rectangular reading space with
reference to a point of origin. For use in conveyor systems where the conveyor belts
are very close to each other and the scan line partly extends over adjacent belts
because the CLV is installed above the belt.
The position of the CLV in relation to the defined reading space and the point of origin
must also be parameterized (scanner position and angular position).
Note
In the case of the line scanner with oscillating mirror, the active deflection range of the
oscillating mirror can also be restricted (CW value).
a)Parameterizing reading area
Fig. 6-2:
Narrowing the reading space using limit values
Reading space:
CP limits
