Operating Instructions
Chapter
10
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-79
Appendix
O
SCILLATING
WITH
FIXED
A
MPLITUDE
mode. In O
SCILLATING
WITH
VARIABLE
A
MPLITUDE
mode, the
deflection range is set for each distance configuration using the O
SCILLATING
M
IRROR
tab in
the "CLV-Setup" program.
Distance configuration
Data record in the CLV for defining a
Ö
focus position for the laser beam for
Ö
dynamic
focus control. The focus position as well as the maximum and minimum
Ö
code position
must be entered on the R
EADING
C
ONFIGURATION
tab in the "CLV-Setup" program for this pur-
pose. In the case of the line scanner with oscillating mirror, the
Ö
oscillating amplitude
(deflection range) is also required. The depths of field for the individual focus positions are
shown as a function of the resolution values in the specification diagrams.
Distance detector
System for recording the distance of objects with a bar code in front of the CLV in stages.
When the bar code is read from above, for example, the distance is detected by installing
photoelectric reflex switches above one another beside the conveyor belt. Together with the
combination of "IN 0" to "IN 4" switching inputs and the assignment table for the
Ö
distance
configurations, the ranges for
Ö
dynamic focus control are defined. Only required if the
Ö
Autofocus function is not used.
Distance profile
When using the
Ö
Autofocus function with differential background (with or without tracking),
the CLV can teach-in the ambient background (without objects) to narrow its active reading
range. The CLV creates a profile of the various distances in its reading field along the scan
lines in a special mode. This profile is then used to detect objects in the reading field and to
set the required focus position at the level of the bar code on the object.
Download
Method of transferring the
Ö
parameter set that was modified with the
Ö
"CLV-Setup" pro-
gram offline from the PC to the RAM of the CLV. CLV-Setup transfers either a complete copy
of the CLV (D
OWNLOAD
TO
CLV) to the memory (RAM) or just the edited parameters using the
right mouse button’s context menus (D
OWNLOAD
P
ARAMETER
). You can overwrite the existing
parameter set in EEPROM of the CLV by choosing the P
ERMANENT
storage option.
Dynamic focus control
Function for shifting the focal point of the laser beam across a wide range in the reading pla-
ne. The dynamic focus control function is event controlled (e. g. by the distance detector) or
dynamic in the
Ö
Autofocus function.
Error messages
Messages in
Ö
plain text that are used to identify a malfunction on the CLV in Reading mo-
de. The messages are output on the terminal interface only. Exception: ST = 3 (device er-
ror), which is also output on the host interface. The error messages can be displayed in
extended mode under T
ERMINAL
EMULATOR
in the "CLV-Setup" program.
Error status
Identifier output with the reading result by the CLV for errors that were diagnosed while the
bar code was being read. The entry for the host interface is made in the separator of the
Ö
data output string and must be enabled using the parameters (enabled by default).