Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 21)

Chapter 3
Installation Considerations
3–8
The pitched symbol’s nearest and farthest elements must be within the
minimum and maximum reading distance of your scanner.
Centering your symbol within the scanner’s minimum and maximum scan
range can help guard against pitched symbols exceeding the scan range
limits. However , you could exceed the scan range with a pitched symbol, as
shown in Figures 3.10 and 3.11.
2755–L7SA
3 ”
Symbol’s Nearest and
Farthest Elements
10”
10 ”
The center of the 3”
(7.6 cm) long symbol,
pitched 0
°
, is
positioned 10” (25.4
cm) from the face of
the scanner.
As you can see, the
2755–L7SA scanner
can be effectively
used for this
application.
3” (7.6 cm) long
symbol pitched 0
°
.
The center of the
symbol is positioned
10” (25.4 cm) from the
face of the scanner.
Scan Range equals
10” (25.4cm).
2755–L7SA
2755–L7SB
2755–L7SD
2755–L7SC
5
.13
25
.64
20
.51
15
.38
10
.25
Minimum Bar Width
Mils
Millimeters
5
12.7
Inches
Centimeters
10
25.4
15
38.1
20
50.8
25
63.5
30
76.2
35
88.9
Scan Range (from face of scanner)
Figure 3.10
Scan Range and Symbol Resolution at 0
°
Pitch
Code Elelment Distance