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SICK CLV490 Instruções de Operação Página 223

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Operating Instructions Chapter 10
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20 © SICK AG · Division Auto Ident · Germany · All rights reserved 10-55
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
v
Line scanner: lateral reading at object
v
s
t
---=
v
l
s
n
----
f×=
v
l
s
nt
scan
×
------------------------ t
scan
1
f
----=;=
n
l
s
v
----
f×=
n
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
S
= 20 mm (0.8 in)
Scanning frequency f = 600 Hz
Bar code 100 % readable
I
s
Fig. 10-40: Line scanner: calculating the number of scans for fence-type bar code arrangements
v
I
LH
I
c
Line scanner: lateral reading on object
v
l
LH
l
c
–()
nt
scan
×
------------------------ t
scan
1
f
----=;=
v
s
t
---=
v
l
LH
l
c
–()
n
------------------------
f×=
n
0.4 1.5–() m
2 m/s
---------------------------------------
600/ s×=
n
l
LH
l
c
–()
v
------------------------
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
C
= 150 mm (5.9 in)
Reading field height l
LH
= 400 mm (15.8 in)
Scanning frequency f = 600 Hz
Bar code 100 % readable,
all scans on the code
Code window s = l
LH
– l
C
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