Rockwell Automation 5370-CVIM2 Module - Manual (Page 226)

5 Chapter Chapter 6
Reference Tools
6–67
This section provides a few simple examples whose purpose is to:
•
Identify the basic steps in the process of configuring a build reference
tool.
•
Indicate the concepts employed by the build reference tool.
•
Illustrate the build reference tool’s operating modes (X Mode, Y Mode,
and Theta Mode).
A build reference can be configured to calculate shift and/or rotation
compensation using either absolute position values or delta (relative)
position values. The difference is described as follows:
•
Absolute ––Using the absolute method, the build reference tool uses
stored (“learned”) position values (which are based on the absolute
X–axis, Y–axis, and theta values in the image) as the basis for providing
shift and/or rotation compensation. This is the method used by the
reference line and reference window tools.
First, the tool calculates the difference between a stored absolute value of
a specific reference (coordinate or angle) and the current absolute value of
the same reference (that is, its value obtained from the current inspection
cycle). Then, it applies the difference value to all referenced tools and
repositions them from their original (“learned”) positions by the amount
of the calculated difference value.
•
Delta –– Using the delta method, the build reference tool does not store
(“learned”) position values as the basis for providing shift and/or rotation
compensation. Instead, the tool calculates position compensation only on
the basis of values entered in the formula(s), and uses the formula results
values to shift and/or rotate all referenced tools from their current
positions in accordance with those results values.
Note that these examples are not intended to show you how to configure the
build reference tool for your application or for any specific application.
Example: X Mode Operation
This example uses a window tool ( Tool 1 ) to supply X–coordinate data to a
build reference tool ( Tool 2 ), which, in turn, supplies “X–only” shift
compensation to two gage tools ( Tool 3 and Tool 4 ). (Although the example
is set up for X Mode operation, the same principles apply to the Y Mode
operation.)
Figure 6.55 (page 6–68) shows how the four tools are arranged in the toolset
edit panel. Their order in the panel, from top to bottom, determines the order
in which they are processed.
Examples: Build Reference
Tool Configuration and
Operation