Interface A2, Release Date: 02.03.2022
Page 20
LVMC User Manul A2 - 499.027.82
OPTRONIC AG
SWITZERLAND
Unteregger Strasse 53
CH-9403 Goldach
Phone: +41 (0)71 844 02 00
Fax:
+41 (0)71 844 02 10
e-mail: [email protected]
web: www.optronic.ch
4.11
Automatic Mode
In the automatic mode, the light curtain analyzes constantly passing objects and, based on this learned in-
formation, autonomously configures the settings “Minimum Area” and optionally “Gap suppression time” of
channels 2 to 4 at runtime. The task is to filter out faulty objects whose size deviates from the standard. It is
assumed that only one object type passes the sensing area during a run.
The meaning of each channel is fixed:
o
Channel 1 counts objects, that have been classified as too small.
o
Channel 2 counts objects with correct size.
o
Channel 3 is used to count objects that have been classified as too large, or to count two ob-
jects of correct size, that follow each other too closely, thus passing the sensing area with-
out gap.
o
Channel 4 is used to count objects that have been classified as too large, or to count three
objects of correct size, that follow each other too closely, thus passing the sensing area
without gap.
The values entered for channel 1 in parameters “Minimum Area” and “Gap Suppression Time” are taken as
minimum values for the automatically determined corresponding values for channels 2 to 4. The channel
parameters “Minimum size”, “Minimum Passing Time” and “Minimum Expected Passing Time” are automati-
cally set to the same values for all channels. They can therefore only be entered for channel 1.
The parameters „Minimum Area“ and „Gap Suppression Time“ are calculated automatically and continuously
for channels 2 to 4 using the given parameter "Bad Rate", the entered percentage of objects that should be
rejected due to a too small or too large area.
Two methods are available for collecting data: By means of all objects that have passed the sensing area
since the automatic mode was started, or rolling over a specified number of objects that have passed the
sending area. The rolling mode compensates for continuous changes, which may be desirable or undesira-
ble.
Selectively, the light curtain can start the object detection without prior knowledge, or with stored initial val-
ues. The initial values are calculated on the basis of collected data from a previous run in which a sufficiently
large number of objects, if possible only correct objects, have passed the sensing area. The calculation of the
initial values must be triggered via the CMT.
It is possible to specify the number of objects, that must have passed the sensing area, before the minimum
area and, if selected, the gap suppression time of channels 2 to 4 are automatically adjusted by the automat-
ic mode. Before this number of objects has passed the sensing area, the values entered in channel 1, with the
exception of the minimum area, are taken over to channels 2 to 4. The minimum areas for channels 2 to 4 are
defined so that all objects are treated as correct objects and thus assigned to channel 2, assuming that these
values are greater than the minimum area entered for channel 1.
To enable a change to another object type, for example, it is possible to restart the automatic mode via a
digital input or independently after a given time during which no object has passed the sensing area.