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Operating Instructions
Chapter
6
CLV 490 Bar Code Scanner
8 009 993/O824/20-12-2004
©
SICK AG · Division Auto Ident · Germany · All rights reserved
6-11
Operation
Note
The minimum and maximum values for the active evaluation range of the scan line (CP
limits) can be checked in the S
HOW
CP-L
IMITS
mode.
See also
Chapter 6.5.5 Show CP-limits, Page 6-47
Recommendation
Don’t configure the reading space if you use the free running mode in combination with a
fixed focus position (fix focus mode). Restrict the reading space using the CP-limits.
•
Autofocus:
Using the periodic distance measurement function, the CLV creates an up-to-date
distance profile in its area of view with every 10th scan. From this profile, the CLV uses
the selected autofocus mode, the parameterized limits of the autofocus area, and the
taught-in background (optional) to automatically determine the required focus position
for a detected object. The defined autofocus area should be within the limits of the
parameterized reading area.
•
Event-controlled focus control:
The CLV controls its focus position by means of distance information, which it receives
either externally via the switching inputs (reading from above: object height detection
by means of photoelectric switches) and their assignment to parameterized distance
configurations, or by means of command strings via the serial data interface (also with
reference to distance configurations). In timer mode (search), the CLV changes its focus
position step by step according to the parameterized number and sequence of distance
configurations. The line scanner with oscillating mirror also uses – similar to the timer
mode – its oscillating mirror reversal points at the maximum deflection points to trigger
the switchover.
The time at which focusing occurs relative to the reading pulse can be selected for both
types of focus control.
Action
Settings in CLV-Setup
Define CP limitations
–
and/or
–
Ö
R
EADING
C
ONFIGURATION
tab
Ö
R
EADING
AREA
section
Ö
CP-L
IMITS
Ö
D
ISTANCE
CONFIGURATION
button
Ö
D
ISTANCE
CONFIGURATION
tab
– configuration 1: Minimum CP and Maximum CP
Oscillating mirror:
– additionally: Oscillating mirror amplitude CW
Define reading space
Ö
R
EADING
AREA
section
Ö
R
EADING
AREA
Ö
R
EADING
S
PACE
P
ARAMETERS
button
– Right edge of conveyor (Y 1)
– Left edge of conveyor (Y 2)
– Level of conveyor (Z 1)
– Maximum scanning height (Z 2)
Define the CLV position referred to the reading space
(point of origin):
Ö
D
EVICE
C
ONFIGURATION
tab
Ö
S
CANNER
P
OSITION
P
ARAMETERS
button
Ö
A
NGLES
– alpha, beta and gamma
Ö
C
OORDINATES
– x-, y- and z-coordinates
Table 6-4: Guide: Configuring the reading area
b) Selecting focus control mode