Rockwell Automation 2755 High Performance VLD Scanner - Manual (Page 18)

3–5 Installation Considerations
Table 3.A
LD4 Read Ranges ➀
Minimum Element Width ➁
Mils Millimeters
Read Range
Inches Centimeters
Catalog Number
4
5
7.5
10
13
20
30
.10
.13
.19
.25
.33
.51
.76 4.0 - 5.25
3.0 - 6.0
2.5 - 6.5
2.5 - 7.25
2.5 - 8.0
2.5 - 9.75
2.5 - 12.0 10.2 - 13.3
7.6 - 15.2
6.4 - 16.5
6.4 - 18.4
6.4 - 20.3
6.4 - 24.8
6.4 - 30.5
2755-LD4A1
2755-LD4A4
6
7.5
10
13
20
30
35
.15
.19
.25
.38
.51
.76
.89 8.0 - 11.5
7.25 - 12.75
6.25 - 14.5
5.0 - 16.0
5.0 - 19.0
5.0 - 19.0
5.0 - 19.0
20.3 - 29.2
18.4 - 32.4
15.9 - 36.8
12.7 - 40.6
12.7 - 48.3
12.7 - 48.3
12.7 - 48.3
2755-LD4B1
2755-LD4B4
9
10
13
20
30
35
40
50
.23
.25
.38
.51
.76
.89
1.02
1.27
14 - 21.0
13.25 - 22.75
10.75 - 28.25
7.5 - 36.0
6.0 - 42.25
6.0 - 45.5
6.0 - 48.5
6.0 - 50.0
35.6 - 53.3
33.6 - 57.8
27.3 - 71.7
19.0 - 91.4
15.2 - 107.3
15.2 - 115.6
15.2 - 123.2
15.2 - 127.0
2755-LD4C1
2755-LD4C4 ➂
20
25
30
35
40
45
50
55 .51
.64
.76
.89
1.02
1.14
1.27
1.40
38.0 - 58.0
36.0 - 68.0
34.0 - 71.5
32.0 - 74.5
30.0 - 78.0
28.0 - 80.0
26.0 - 82.0
24.0 - 84.0 96.5 - 147.3
91.4 - 170.0
86.4 - 181.6
81.3 - 189.2
76.2 - 198.1
71.1 - 203.2
66.0 - 208.3
61.0 - 213.4
2755-LD4E1
2755-LD4E4 ➂
➀ Read ranges based on 4 character, Code 39 labels with a wide to narrow bar ratio of
2.6 to 1 and a print contrast ratio of .75 or better. Read ranges will vary with bar code
symbol quality.
➁ For minimum element width, refer to ”Determining Apparent Minimum Element Width”
in Chapter 3.
➂ The glare that results from the laser striking reflective objects (conduit, metal
conveyors) may affect performance of the LD4C and LD4E scanners when used at
long ranges. To minimize this effect, mask the area behind the symbol with a
non-glossy material (flat black paint) or reduce the scan line to avoid reflective objects.
Reducing the scan line will affect reading distances of the scanner.