Rockwell Automation 2755 High Performance VLD Scanner - Manual (Page 30)

3–17 Installation Considerations
Code Element Distance
The nearest and farthest elements of a pitched symbol must be within
the minimum and maximum reading distance of the scanner.
Centering the symbol within the scanner’s read range helps to
prevent pitched symbols from exceeding the read range limits. You
can still exceed the read range with a pitched symbol, as shown in
Figures 3.12 and 3.13.
Figure 3.12
Read Range and Symbol Resolution at 0
_ Pitch
Symbol’s Nearest and Farthest
Elements are 18 inches (45.7 cm)
18 inches (45.7 cm)
2755–LD4B1
5
.13
10
.25
15
.38
20
.51
25
.64
30
.76
35
.89
40
1.02
45
1.14
50
1.27
5
12.7
10
25.4
15
38.1
20
50.8
25
63.5
30
76.2
35
88.9
40
101.6
45
114.3
50
127.0
Apparent Minimum Element W
idth
Mils
Millimeters
Inches
Centimeters
Read Range
(from scan window)
A
B
C
3 inch (7.6 cm) symbol is pitched
0
_. The center of the symbol is
18 inches (45.7 cm) from the face
of the scanner.
Element width = 20 mils (.51mm)
The center of the 3 inch (7.6 cm)
symbol is positioned 18 inches
(45.7 cm) from the front of scanner.
The 2755–LD4B1 scanner can
be used in this application.