Chapter
10
Operating Instructions
CLV 42x bar code scanner
10-24
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 009 981/O078/16-08-2004
Appendix
10.7
Calculating parameter values for setting the CLV
10.7.1
Calculating the number of scans
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 arrangement
Fig. 10-9:
Line scanner: calculating the number of scans for ladder-type bar code arrangements
l
S
v
Line scanner: side 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
Specifications:
Number of scans n = ?
Conveyor velocity v = 1.5 m/s
Bar length l
S
= 20 mm
Scanning frequency f = 600 Hz
Barcode 100 % readable
Fig. 10-10: Line scanner: calculating the number of scans for fence-type bar code arrangements
v
I
LH
I
c
Line scanner: side reading at 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 – 0,15
(
)
m
2 m/s
---------------------------------------
600/ s
×
=
n
l
LH
l
c
–
(
)
v
---------------------
f
×
=
n = 75
Specifications:
Number of scans n = ?
Conveyor velocity v = 2 m/s
Code length with rest zone l
C
= 150 mm
Reading field height l
LH
= 400 mm
Scanning frequency f = 600 Hz
Bar code 100 % readable, all scans on
the code window s = l
LH
-l
C
