Bar code tape
Leuze electronic GmbH + Co. KG
BPS 8
22
Figure 5.4: Measurement range changeover via MVS control bar code
5.3
Marker bar codes
Marker bar codes, which are affixed at the appropriate locations via a position bar code, can be used to
trigger various functions in the superior control. The BPS 8 detects the defined marker bar codes in the
scanning beam, decodes them, and makes them available to the control.
NOTE
If, upon reaching the center of the MVS control bar code, the BPS 8 does not detect the value
range of the subsequent BCB in the scanning beam, the position value of the first BCB sec
-
tion is still output for half of the label width starting from the center of the MVS control bar
code.
NOTE
Measurement range changeover!
The measurement range changeover from the preceding to the subsequent BCB occurs when
the center of the BPS 8 (C in Figure 5.4) is opposite the center of the control bar code (B in
NOTE
Hysteresis for measurement range changeover!
If a measurement range changeover occurs in the center of the MVS control bar code to the
subsequent BCB, a hysteresis range of ± 2mm (E in Figure 5.4) is activated.
If the direction of movement is reversed within this hysteresis range, a measurement range
changeover occurs to the preceding BCB 15 mm after the center of the MVS control bar code.
Within this range of 15 mm, the position values are calculated from the subsequent BCB.
BCB8
*
*
*
*
*
A
B
A Scanning beam
B Control bar code center
C BPS 8 center
D Direction of movement
E MVS hysteresis range
D
C
E
E
NOTE
Distance between two marker bar codes!
Make certain that there is only one marker bar code (or control bar code) in the scanning
beam at a time.
The minimum distance between two marker bar codes is determined by the distance
between the BPS 8 and bar code tape and the resulting length of the scanning beam.
