Rockwell Automation 5370-CBPK Color CVIM BLISTER-PAK Option - Manual (Page 48)

Chapter 6
Adjusting Blister Windows
6–6
the cursor up or down, the value in the Min BG Area menu item changes
accordingly.
Extra Area % (Non–Aluminum Blisters)
This section applies only if you selected Disabled in the Aluminum: menu
item. In this case, it is assumed that the blister package is made of a plastic
whose color is uniform and whose pockets are indistinguishable from the rest
of the package. Thus, when the background color is learned during the auto
setup process, the pockets are included
1 as part of the background color and
become “invisible” insofar as the inspection is concerned.
The term “extra area” refers to any area that is adjacent to an object, and in
which the background color is absent. In typical applications, some extra
area may be unavoidable because of lighting constraints or other factors that
cannot be changed. In these situations, the
Extra Area % feature can be used
to accommodate this normally occurring extra area.
Figure 6.6 illustrates the extra area concept for non–aluminum blisters.
Figure 6.6
Extra Area Concept (Non–Aluminum Blisters)
The system will regard this object
as “foreign” if it increases the
“extra area” around the object
beyond the Extra Area % setting.*
Objects
*If the color of the foreign object has been taught, it will be detected if its area exceeds the
Min. Area (not Min BG Area ) setting.
Lighting conditions may normally cause a slight
shadow, which the system would detect as a
“hole” in the background color. The Extra Area
% setting can be adjusted to accommodate this.
The system will always regard this “hole” in
the background color as “foreign” material if
its area is larger than the Min. BG Area setting.
1 If the pockets cannot be included in the background color, you may need to select Enabled in the Aluminum:
menu item.