Chapter
6
Operating Instructions
CLV490 Bar Code Scanner
6-16
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Operation
Event-controlled focus position switchover (alternative)
Event-controlled focus position switchover can be used if the autofocus function does not
provide the expected accuracy for the application. Event-controlled focus position
switchover is required in the following cases, for example:
•
Conveyed material with a black surface (e.g. vehicle tires)
The laser light emitted by the CLV490 is absorbed by the surface of the material, which
means that the distance measurement may no longer be sufficiently accurate.
•
Conveyed material with highly reflective surfaces (e.g. anti-static bags)
•
Conveyed material with bar codes on the front edge in the conveying direction. At high
conveyor speeds, the CLV490 can no longer adjust the focus in time.
•
Scanning frequency
Ö
R
EADING
CONFIGURATION
tab
Ö
R
EADING
P
ARAMETERS
section
•
Blank zone
Ö
R
EADING
CONFIGURATION
tab
Ö
R
EADING
P
ARAMETERS
/S
TART
/
STOP
RATIO
section
•
Poor quality bar code print (e.g. small contrast or scattered print)
Ö
R
EADING
CONFIGURATION
tab
Ö
C
ODE
LABEL
/B
ACKGROUND
CHARACTERISTCS
section
•
If reading bar codes with small height (bar lenght) using the SMART decoder
Ö
C
ODE
CONFIGURATION
tab
Ö
D
ECODER
section/S
MART
P
ARAMETERS
button
Action
Settings in CLV-Setup
1. Set up distance
configurations
Ö
R
EADING
C
ONFIGURATION
tab
Ö
R
EADING
A
REA
section
Ö
D
ISTANCE
CONFIGURATION
button
Ö
D
ISTANCE
CONFIGURATION
tab
– Focus position
Oscillating mirror:
– additionally: Oscillating mirror amplitude CW
Ö
A
SSIGNEMENT
T
ABLE
tab
– Index
– Valid configurations
To restrict the reading area for all valid distance configurations
proceed as described in
, reading angle
limits
2. Select focus position
switchover (refered to the
start of the reading interval)
Ö
R
EADING
C
ONFIGURATION
tab
Ö
F
OCUS
C
ONTROL
sections
Ö
I
NPUTS
/S
ERIAL
/A
UTOFOCUS
– immediate or synchronous (default setting)
or
– latched (special application)
3. I
NPUTS
/S
ERIAL
trigger source:
select function for "IN 3"
and "IN 4" switching inputs
Ö
D
EVICE
C
ONFIGURATION
tab
Ö
A
SSIGNMENT
OF
I
NPUTS
section
Ö
IN 3
– Focus control
Ö
IN 4
– Focus control
Table 6-8: Guide: Configuring focus position switchover
d) Parameterizing optical reading characteristics
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