Table 7: Permitted read angle between scanning line and bar code
Angle Limit Value
Tilt α Max. 30°
Pitch β Max. 45°
Skew γ Max. 45°
5.3.4 Avoidance of surface reflections
If the light of the scan line(s) hit(s) the surface of the bar code precisely vertically, this
may cause interference when the light reflected back is received. To prevent this effect,
the device must be mounted so that the light emitted is tilted relative to the vertical.
Line scanner
(reading window on front)
Line scanner
(reading window on side)
(Top view)(Top view)
105° 105°
1 2
3
3
Figure 14: Avoiding surface reflections on the example line scanner: Angle between light emitted
and bar code (tilting away from vertical)
1
Line scanner (reading window on front)
2
Line scanner (reading window on side)
3
Supervision
5.3.5 Count direction of the reading angle and the code angle
The device can scan and decode several bar codes at each reading.
At the same time, the location-specific reading diagnostics data are determined for
each of them.
■
The reading angle, starting from the reading window, at which the device detects
the bar code center on the red scanning line of the deflected scanning beam can
be outputted as an RA (reading angle) value.
By determining the respective RA value, identical bar codes (code type, code length,
and data content) can be separated, and the bar code data can be assigned based on
its position on the object.
Figure 15: Counting direction of the reading angle RA in the scanning line on devices with front
and side reading windows
MOUNTING
5
8017842/ZOK7/2019-02-01 | SICK O P E R A T I N G I N S T R U C T I O N S | CLV61x DualPort (PROFINET)
31
Subject to change without notice
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