Chapter
6
Operating Instructions
CLV490 Bar Code Scanner
6-46
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Operation
6.5.5
Show RA-limits
In this mode, the CLV490 blanks certain parts of the red scan line so that any limit values
defined for the active evaluation range of the scan line can be checked directly during
parameterization. The restricted active evaluation range shortens the evaluation time for
fast applications, for example, because the evaluation routine only has to take account of
unblanked parts of the scan line. The range is restricted by entering appropriate values for
M
INIMUM
R
EADING
ANGLE
and M
AXIMUM
R
EADING
ANGLE
in the D
ISTANCE
C
ONFIGURATION
tab.
The CLV490 does not output a reading result in this mode.
Show RA-limits enables you to check whether
•
The visible range of the CLV490 has been defined accordingly for the selected setting
in autofocus mode (restriction is independent of reading distance and always the same)
•
The restriction has been adapted for each active distance configuration in event-
controlled dynamic focus control ("Christmas tree" effect)
Show RA-limits can be called up via V
IEW
in the menu bar, as a device function via CLV490
(interactively), or via the Terminal Emulator.
Line scanner with oscillating mirror:
In "Show RA-limits" mode, the CLV490 behaves in the following manner:
–
in "Oscillating" mode (default setting: oscillating with a fixed amplitude), the CLV490
shuts off oscillation and positions the scan line under the angle CW = 50 (corresponds
to an angle of deflection below 105
°
). This position cannot be altered.
–
in "One-Shot" mode, the CLV490 positions the scan line under the angle CW = 50.
–
in "Fixed Position" mode, the scan line’s selected position remains unchanged.
The CLV490 blanks the scan line alternately as of the set value for RA
min
and as of the set
value for RA
max
shows an example of this. The switchover is made continuously
at intervals of 1 second. The part of the scan line that remains active for the reading
procedure is the section between RA
min
and RA
max
.
Example
:
Default setting: RA
min
= 5 to RA
max
= 95.
The CLV490 blanks the line as of RA
min
= 5 (short scan line) and as of RA
max
= 95 (long line).
Fig. 6-13:
Appearance of scan line in the "Show RA-limits" mode
RA
max
Active range
RA
min
Scan line 2
Scan line 1
Show RA-limits
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