Operating Instructions
Chapter
10
CLV 480 Bar Code Scanner
8 010 080/O824/10-02-2005
©
SICK AG · Division Auto Ident · Germany · All rights reserved
10-41
Appendix
10.8
Calculating parameter values for setting the CLV
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. 10-29: 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
n
t
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 (295.2 ft/min)
Bar length l
S
= 20 mm (0.8 in)
Scanning frequency f = 600 Hz
Bar code 100 % readable
I
s
Fig. 10-30: 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
–
(
)
n
t
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 (393.6 ft/min)
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
