Baumer BA DenexMicro - Manual (Page 12)

User Manual DENEX MICRO 12/24 Baumer Electric AG
Version 2013-02, V1.6 www.baumer.com Frauenfeld, Switzerland
6 SOFTWARE FUNCTIONS
The real power with a microprocessor-based sensor is that the sensor learns what the
products and the stream look like and make decisions according to this. Before actual
settings are discussed, first a short description of the major functions and terms.
6.1 Application Setting
The sensor can be optimized around certain applications. Things like output pulse width,
Blocking Function and Back Edge Check parameters are set a little different for each
application in order to reach the highest possible accuracy.
There are four DIP-switches that tell the sensor which application it should be set for.
It is very important to set the right application!
6.2 Blocking Function
This function will eliminate false counts due to double edges or a cut-edge-first delivery.
The sensor will count edges coming within the blocking zone as one product. In
productions using stitches, extra pulses due to the stitch are blocked out by this function.
The blocking zone is a dynamic value that constantly adapts to the average distance
between copies. It will be either 15% or 30 % of the mean lap, depending on application.
The average distance between copies is 100%, see figure 6.2.1.
Figure 6.2.1 The principle of the blocking function.
The blocking zone is marked with gray. 15% is the first half, and 30% is whole area.
6.3 Back-Edge Check (In counting mode)
Normal flat back-edges are never counted. However, if the back-edge is bent, this part of
the paper can result in a miscount. The sensor can be configured to wait a certain time to
decide whether the edge that was found was really a copy or if it was an up bent back-
edge of the product, or a pin hole on the back of the paper. DIP-switches must be set to
choose Newspaper-application in order to activate this function.
The Back-Edge Check will affect the timing of the output pulse also on normal edges, but
will give a higher counting accuracy. Therefore, in timing applications like edge detecting,
the Back-Edge Check is disabled.