Bar code tape
Leuze electronic GmbH + Co. KG
BPS 8
21
Figure 5.3: Correct positioning of the control bar code
BCB G30 ... control bar code MVS
With the MVS control bar code, there is precise and reproducible switching between two bar code tapes
with different value ranges.
• The end of the preceding bar code tape and the start of the subsequent bar code tape can end and
begin, respectively, with completely different position bar codes.
• BCB changeover by means of a control bar code always occurs at the same position, i.e., it serves to
change from the preceding tape to the subsequent tape and vice versa.
• If the center of BPS 8 reaches the center of the MVS control bar code at the transition position, the
value range of the subsequent BCB is switched to – provided the BPS 8 has the next position bar
code in the scanning beamsee figure 5.4.
This means the output position value is always uniquely assigned to the preceding or subsequent
BCB.
NOTE
Gaps in bar code tape!
Avoid polished and high-gloss surfaces.
Keep the gaps between the two bar code tapes and the control bar code as small as possi
-
ble.
NOTE
1 m difference in the bar code position values for correct measurement value switching!
For different BCB value ranges, make certain that the position value has a value distance of
minimum 1 m between the preceding position bar code (before the control bar code) and the
subsequent position bar code (after the control bar code).
Example: If the last position bar code on the BCB G30 ... before the control bar code is
’075120’, the following position bar code on the BCB G30 ... after the control bar code must
be at least ’075222’ (printed values BCB G30 ... in cm).
If the minimum value range distance of 1 m between the bar code values is not maintained,
position determination may be faulty.
BCB8
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A
B
A Control bar code perfectly affixed on the bar code tape
B Control bar code at small gap between two bar code tapes
