Operating Instructions
Chapter
10
CLV 45x Bar Code Scanner
Appendix
8 009 139/K949/06-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-35
10.7
Calculating parameter values for setting the CLV
10.7.1
Calculating the number of scans (for standard decoders)
The maximum possible number of scans for a bar code depends on the transporting
speed v.
Line scanner: Ladder-type bar code positioning
Line scanner: Fence-type bar code positioning
Fig. 10-21: Line scanner: Calculating the number of scans for ladder-type bar code positioning
l
S
v
Line scanner: Lateral reading at object
v
s
t
---
=
v
l
s
n
----
f
×
=
v
l
s
n
t
s can
×
------------------------ t
sc an
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 = ?
Transporting speed v = 1.5 m/s
Bar length l
S
= 20 mm
Scanning frequency f = 600 Hz
Bar code 100 % readable
Fig. 10-22: Line scanner: Calculating the number of scans for fence-type bar code positioning
l
LH
l
C
v
Line scanner: Lateral reading at object
v
l
L H
l
c
–
(
)
n
t
scan
×
------------------------ t
sc an
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
L H
l
c
–
(
)
v
------------------------
f
×
=
n = 75
Calculation for
standard decoder!
Specified values:
Number of scans n = ?
Transporting speed v = 2 m/s
Code length with idle zone l
C
= 150 mm
Reading area height l
LH
= 400 mm
Scanning frequency f = 600 Hz
Bar code 100 % readable, all scans on
the code
Code window s = l
LH
– l
C
