KEYENCE BL-700 Series - Manual (Page 138)

Appendices
124
Appendices
■ BL-780/781
Unit: mm
Bar code type Narrow bar width Reading Max. readable
distance label width
A CODE39 0.32 480 to 580 435
B CODE39 0.5 320 to 870 735
C CODE39 1.0 200 to 1100 930
D CODE39 2.0 200 to 1200 1010
Reading distance
(mm)
(Focal length)
Readable label width
(mm)
(Measuring conditions)
• The KEYENCE standard
bar code is used.
• Ratio of thin bar to thick bar
= 1:2.5
• Skew: 0°
• Pitch: 0°
• Tilt: 0°
* For the reading distance measuring reference, see P.28.
Note 1: The readable label width means a bar code length including the right and
left margins (quiet zones) of a bar code.
Note: 2 Even if a bar code is within the above reading range, it may not be read
depending on the bar code quality. Set the optimum reading position based on
enough reading tests.
Note 3: Normally, the reading distance should be set to 500 mm (focal length). In
this case, the maximum readable label width is 465 mm (when the narrow bar
width is 0.5 mm or more).
400 465 435 735 930 1010
0 100
500
200 300 400 500 600 700 800 900 1000 1100 1200
600
500
400
300
200
100
100
200
300
400
500
600
0
D
C
B
A