Barcode reader VB34
Installation
Da
te
of
issue
06/
1
3
/2005
52
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
6.8.1
Fixed adjustment
With fixed adjustment, the read distance (in cm/inch) is adjusted as fixed to the
desired position per software. This is the most simple Flash™ function, during which
the focus position is adjusted per software before use in the application and stored in
the decoder of the reader. This function is similar to the focus adjustment of the VB33
reader, however, with the major difference that in terms of software the adjustment is
made using the configuration program and not manually via an adjustment screw.
Figure 6.58
Flash™ fixed adjustment
6.8.2
Continuous adjustment
With continuous adjustment, the focus position is continuously adjusted with a defined
frequency (f1 in the following figure) between minimum and maximum. This Flash™
function makes it possible to use the entire read range of the VB34 if the objects to be
recognized are large and move slowly. Typical areas of application for continuous
adjustment are reading the front of large pallets or objects on a fork lift truck.
Figure 6.59
Flash™ continuous adjustment
6.8.3
Trigger operating mode
In the trigger operating mode, the focus position is adjusted depending on an external
input signal (light barrier, message via the serial interface…). This is the traditional
Flash™ function, for which light barriers or a separate interface to the host (PC or
PLC) are required. The excellent capability of the VB34 optical system platform
makes it possible to cover an area of 800 mm x 800 mm with a code resolution of
38 mm using only one light barrier.
