Device description
Leuze electronic
BPS 348i
21
3.4.2 Control bar codes
With the help of control bar codes that are affixed on top of the bar code tape at appropriate positions, func
-
tions in the BPS can be activated or deactivated, e.g., for changing various position values at switches.
MVS
and
MV0
are control bar codes for the direction-independent switching of the position values from
one bar code tape to another in the middle of the control bar code label.
• If, upon reaching the changeover position in the middle of the
MVS
label, the BPS does not detect
the new BCB section in the scanning beam, the position value of the first BCB section is still output
after the middle of the
MVS
label for half of the label width.
• If, upon reaching the changeover position in the middle of the
MV0
label, the BPS does not detect
the new BCB section in the scanning beam, no position value is output after the middle of the
MV0
label.
Code type Code128 with character set B is used for the control bar code.
Arrangement of the control bar codes
The control bar code is attached in such a way that it replaces one position bar code or seamlessly
connects two bar code tapes with different value ranges to one another (see figure 3.11).
1
Control bar code
2
The control bar code is decoded in the marked scans
Figure 3.11: Arrangement of the control bar codes
The control bar codes are simply affixed over the existing bar code tape.
A control bar code should cover an entire position bar code and must have the correct grid dimension (see
figure 3.12):
• 30 mm with BCB8 bar code tapes
• 40 mm with BCB bar code tapes
NOTICE
Distance between two control bar codes!
Make certain that there is only one control bar code (or marker label) in the scanning beam at a time.
The minimum distance between two control bar codes is determined by the distance between the BPS
and bar code tape and the resulting length of the scanning beam.
Keep the gap between the BCBs that are switched between as small as possible.
2
000040
000044
000048
0150000
015004
1
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