Rockwell Automation 5370-CBPK Color CVIM BLISTER-PAK Option - Manual (Page 14)

Chapter 2
Functional Overview
2–7
This section describes various aspects of the BLISTER–PAK option’s setup
and inspection processing that must be considered when planning an
application. These include some limitations of the inspection processing, and
techniques for most effectively using the BLISTER–PAK option to detect
specific types of defects.
Color Teach
Uniform Background Color –– The taught background color is used for
determining the object positions when teaching the foreground colors, and
for detection of foreign material if background inspection is enabled. A
relatively uniform background is required in order to be able to train the
background color effectively, and in most applications this can be achieved
through careful lighting and imaging design. Ideally, the background region
surrounding the tablets or capsules should be the same color throughout the
image, without any glare or other anomalies that might be confused with
foreign material. The background should also be of a color that contrasts
with the color(s) of the tablets / capsules to be inspected.
If it is not possible to teach a background color that effectively defines the
background region, the application can usually still be done. In such a case, it
will be necessary to train the foreground color(s) manually, as the automatic
color teach will not work. In this case it will also be necessary to disable
background inspection. All other inspection operations can be performed if
the foreground colors can be taught adequately.
3–Color Capsules –– Some capsules are produced with two
different–colored halves, and a central band of a third color. The
BLISTER–PAK option can be used to inspect these capsules as 2–color
capsules, but it will not verify the presence of the central color band. If the
band is exceptionally wide, it may be necessary to teach the two foreground
colors manually because the automatic color–teach may not work properly.
Defect Detection
The BLISTER–PAK option tests for all defects within a single blister in a
specific priority order, as follows (the defect types appear in this order on the
Machine Stop menu):
•
Foreign –– This error is possible only when background inspection is
enabled, and is reported if an extra “hole” exists in the background color,
or if the area of the region around a particular pocket exceeds the area of
the object(s) it contains plus the
Extra Area tolerance.
•
Empty –– This error is reported if a blister contains no objects of the
taught color(s). It is not considered more significant than the errors to
follow, but is detected first because no other errors are possible if the
blister contains no objects.
•
Extra –– This error is reported if a blister contains more objects than
were trained. This might include an object of a known color.
Application Considerations