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Chapter 10 Operating Instructions

CLV490 Bar Code Scanner

Appendix

10.8.3 Calculating the necessary capture area for the bar code if several bar codes

are read on each object

Fig. 10-43: Required distance between the bar codes on an object

ABCDE ABCDE

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 (19.7 mil)

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

f800 /s

dy = 7 x 2.5 mm = 17.5 mm (0.7 in)

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

APTURE AREA between the bar codes must be parameterized correctly

EVICE CONFIGURATION tab, TRACKING PARAMETERS button)

2. The reading angle comparison must be activated

ODE CONFIGURATION tab, SEPERATE CODES DEPENDENT ON READING ANGLE section)

Bar code lines in conveyor direction:

If the scan line is to detect bar codes of the same name with the same reading angle, the travel

information must be supplied by an external incremental encoder 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!

CODE CONFIGURATION tab: due to the function SHORT CAPTURE AREAS under SMART-PARAMETER

smaller code distances as described above are possible (depending on application)

1 2 ... 221 222 223 224 225 226 227 228 229 230 231 ... 269 270

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SICK CLV490 Betriebsanleitung Seite 226