Rockwell Automation 5370-CVIM2 Module - Manual (Page 193)

Chapter 6
Reference Tools
6–34
Single Pass vs Double Pass
You can configure a reference window tool so that the feature window makes
either one or two “passes” through the search window. In most cases, two
passes are more efficient than one pass: The first pass locates the feature
approximately, after which the second pass locates the feature more precisely,
but with a smaller region to search.
The choice of Single Pass or Double Pass depends the details of your
application; thus, some trial and observation may be required in order to
determine which choice is the most effective and efficient.
To select Double Pass when Single Pass is showing (or vice versa), pick
the Passes field to toggle to the other choice. (Note that Double Pass is
the default selection. When you toggle to Single Pass , the button
becomes shaded, indicating that it is inactive.)
First Pass Configuration
When you pick the button, the First Pass configuration panel
appears on the display, as illustrated in Figure 6.29. (Also appearing are the
feature and search windows with their images altered according to the default
parameter settings in the
First Pass panel. These are explained in the
masking and scaling sections.)
Figure 6.29 Example: First Pass Configuration Panel
Search window
Feature window