SICK CLV490 Instructions d'exploitation télécharger pdf (Page 223)

Operating Instructions Chapter 10

CLV490 Bar Code Scanner

Appendix

10.8 Calculating parameter values for setting the CLV490

10.8.1 Calculating the number of scans (for standard decoder)

The maximum number of scans possible for a bar code depends on the conveyor velocity v.

Line scanner: ladder-type bar code arrangement

Line scanner: fence-type bar code arrangements

Fig. 10-39: Line scanner: calculating the number of scans for ladder-type bar code arrangements

Line scanner: lateral reading at object

---=

----

f×=

scan

------------------------ t

scan

----=;=

----

f×=

0.02 m

1.5 m/s

-----------------------

600/s×=

n = 8

Calculation for

standard decoder!

Specified values:

Number of scans n = ?

Convoyer velocity v = 1.5 m/s

Bar length l

= 20 mm (0.8 in)

Scanning frequency f = 600 Hz

Bar code 100 % readable

Fig. 10-40: Line scanner: calculating the number of scans for fence-type bar code arrangements

Line scanner: lateral reading on object

–()

scan

------------------------ t

scan

----=;=

---=

–()

------------------------

f×=

0.4 1.5–() m

2 m/s

---------------------------------------

600/ s×=

–()

------------------------

f×=

n = 75

Calculation for

standard decoder!

Specified values:

Number of scans n = ?

Convoyer velocity v = 2 m/s

Code length with blanc zone l

= 150 mm (5.9 in)

Reading field height l

= 400 mm (15.8 in)

Scanning frequency f = 600 Hz

Bar code 100 % readable,

all scans on the code

Code window s = l

– l

1 2 ... 218 219 220 221 222 223 224 225 226 227 228 ... 269 270

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SICK CLV490 Instructions d'exploitation Page 223

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