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
6-47
Operation
6.5.5
Show CP-limits
In this mode, the CLV 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
C
ODE
P
OSITION
and M
AXIMUM
C
ODE
P
OSITION
in the D
ISTANCE
C
ONFIGURATION
tab.
The CLV does not output a reading result in this mode.
Show CP-limits enables you to check whether
•
The visible range of the CLV 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 CP-limits can be called up via V
IEW
in the menu bar, as a device function via CLV 490
(interactively), or via the Terminal Emulator.
Line scanner with oscillating mirror:
In "Show CP-limits" mode, the CLV behaves in the following manner:
–
in "Oscillating" mode (default setting: oscillating with a fixed amplitude), the CLV 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 CLV positions the scan line under the angle CW = 50.
–
in "Fixed Position" mode, the scan line’s selected position remains unchanged.
The CLV blanks the scan line alternately as of the set value for CP
min
and as of the set value
for CP
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 CP
min
and CP
max
.
Example
:
Default setting: CP
min
= 5 to CP
max
= 95.
The CLV blanks the line as of CP
min
= 5 (short scan line) and as of CP
max
= 95 (long line).
Fig. 6-13:
Appearance of scan line in the "Show CP-limits" mode
CP
max
Active range
CP
min
Scan line 2
Scan line 1
Show CP limits
