SICK Omni CLX 490-0010, Руководство по эксплуатации

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Operating Instructions Chapter 10
CLX 490
8 009 237/0000/07-05-2002 © SICK AG · Division Auto Ident · Germany · All rights reserved
10-25
Appendix
10.8 Calculating parameter values for setting the CLX
10.8.1 Calculating the necessary bar code distance if several bar codes are read on
each object
Fig. 10-14: Required distance between the bar codes on an object
A B C D E A B C D E
A B C D E A B C D E
dx
dx
dy
SMART Decoder:
for bar codes with identical code type and identical or different data contents.
Distance dx: min. 60 x module width
e. g. 30 mm for module width 0.5 mm
Distance dy: 7 x d
scan
where d
scan
= vertical distance between two consecutive scan lines
e. g. scan line 90
°
to bar code, scanning frequency 800 Hz, v = 2 m/s
V 2000 mm/s
dscan = ---- dscan = -------------------- = 2.5
f 80 0 /s
dy = 7 x 2.5 mm = 17.5 mm
Standard Decoder:
The above distances are also required for reading bar codes with identical names (identical
data content and code types).
Prerequisite for separating bar codes with identical names:
1. The C
ODE DISTANCE
between the bar codes must be parameterized correctly
(D
EVICE CONFIGURATION
tab, E
DIT TRACKING PARAMETERS
button)
2. The code position comparison must be activated
(C
ODE CONFIGURATION
tab, under C
ODE POSITION
)
Bar code lines in conveyor direction:
If the scan line is to detect bar codes of the same name with the same code position, the travel
information must be supplied by an external incremental sensor or the internal INC timer so
that the bar codes can be distinguished from one another.
Rule of thumb: the blank zone should surround the bar code completely!