Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 10)

Chapter 2
Product Description
2–3
Figure 2.3 illustrates the average reading ranges, relative to the symbol’s
minimum bar width, that you should expect when using an L9 scanner with
your Catalog No. 2755–DM9 Decoder.
Figure 2.3
Average Scan Range vs. Minimum Bar Width for L9 Scanner
5
12.7
Inches
Centimeters
10
25.4
15
38.1
20
50.8
25
63.5
30
76.2
35
88.9
2755–L9SA
2755–L9RA
2755–L9SB
2755–L9RB
2755–L9SD
2755–L9RD
5
.13
35
.89
30
.76
25
.64
20
.51
15
.38
10
.25
Mils
Millimeters
Minimum Bar Width
① Scan Range will vary with symbol quality, pitch and skew. This application was based on no
more than 5
°
pitch and 30
°
skew, with full scan beam (Figure 5.3). Refer to Chapter 3, Installation
Considerations when reading labels with more than 20
°
pitch.
Scan Range (from face of scanner) ①
The following compares the minimum bar width to the scan range of each
catalog number.
Minimum Bar Width Scan Range ② Catalog Number
Mils mm Inches Centimeters
Side
Scanning
Raster
Scanning
7.5
10
20
.19
.25
.51 6.5 – 8.5
6.0 – 9.0
5.0 – 11.0
16.5 – 21.6
15.2 – 22.9
12.7 – 27.9
2755–L9SA ① 2755–L9RA ①
11
20
25
.28
.51
.64 10 – 13.5
9 – 16
8.5 – 18
25.4 – 34.3
22.9 – 40.6
21.6 – 45.7
2755–L9SB 2755–L9RB
16
25
35 .41
.64
.89 10.5 – 21.5
9.0 – 25.5
7.5 – 30
③
26.7 – 54.6
22.9 – 64.8
19.1 – 76.2 ③
2755–L9SD 2755–L9RD
② Scan range will vary with symbol quality. This application was based on no more than 5 °
pitch and 30
°
skew with
full scan beam (Figure 5.3). Refer to Chapter 3, Installation Considerations when reading labels with more than 20
°
pitch.
③ Scan range may be reduced when using low contrast labels.
L9 Reading Ranges