SICK CLV 422

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
nt
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
–()
nt×
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