Allen-Bradley 2755 Manual do Utilizador descarregar pdf (Página 20)

Using the Scanner

Chapter 3

3–4

The scanners can read bar code labels at various

distances depending on the bar code width (width of

narrowest element in bar code, either bar or space).

Table 3.B defines the scanning ranges for both the

standard and long range scanner. Scanning ranges are

listed for symbols with bar code widths from 6.0 mil

to 55.0 mil (.15 mm to 1.40 mm).

Table 3.B

Scanning Ranges: Standard and Long Range Scanners

Bar Code

Width

Standard Range

(2755-G3-D)

Long Range

(2755-G6-D)

6.0 mil

(.15 mm)

3.0 in - 5.0 in

7.6 cm - 12.7 cm

N.A.

7.5 mil

(.19 mm)

2.5 in - 7.5 in

6.4 cm - 19.0 cm

N.A.

10.0 mil

(.25 mm)

1.0 in - 10.0 in

2.5 cm - 25.4 cm

N.A.

15.0 mil

(.38 mm)

1.5 in - 14.0 in

3.8 cm - 35.6 cm

8.0 in - 22 in

20.3 cm - 55.9 cm

20.0 mil

(.51 mm)

2.5 in - 18.0 in

6.4 cm - 45.7 cm

12 in - 36 in

30.5 cm - 91.4 cm

40.0 mil

(1.02 mm)

9.0 in - 25.0 in

22.9 cm - 63.5 cm

23 in - 60 in

58.4 cm - 152.4 cm

55.0 mil

(1.40 mm)

12.0 in - 30.0 in

30.5 cm - 76.2 cm

23 in - 66 in

58.4 cm - 167.6 cm

Figure 3.1 illustrates the scanning ranges in graphic

form. The figure shows that the scanning range of

the standard range scanner for a 40.0 mil (1.02 mm)

bar code width is 9.0 - 25.0 inches (22.9 - 63.5 cm).

The scanning range of the long range scanner for the

40.0 mil (1.02 mm) bar code width is 23 - 60 inches

(58.4 - 152.4 cm).

Scannin

Ranges

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 103 104

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