Table 5: Permitted read angle between scanning line and bar code
Angle
Limit Value
Tilt α
Max. 30°
Pitch β
Max. 45°
Skew γ
Max. 45°
5.4.4
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 13: 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
5.4.5
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 on the red scanning line of the deflected scanning beam, can be out‐
put as an RA (reading angle) value.
By determining the RA value, identical bar codes (code type, code length, and data con‐
tent) can be separated, and the bar code data can be assigned due to its position on
the object.
RA
0
100
Figure 14: Example for count direction and RA value determination in a device with a side read‐
ing window
5
MOUNTING
24
O P E R A T I N G I N S T R U C T I O N S | CLV61x Dual Port (PROFINET)
8017842/ZMG5/2017-06-12 | 8M_DR | SICK
Subject to change without notice
