Rockwell Automation 5370-CVIM2 Module - Manual (Page 223)

Chapter 6
Reference Tools
6–64
This section discusses the build reference tool and the shift and rotation
compensation that it can provide to other tools.
A reference line, reference window, or rotation finder tool provides shift
and/or rotation compensation to other tools that have the same X– and
Y–axis orientation in the image field as the reference tool (whether or not the
images are all from the same camera). It derives the coordinate and angle
references values that it uses for its compensation functions directly, from its
own lines or windows.
A build reference tool, however, can “build” a reference tool using results
data from other tools (such as gage and window tools), along with other
values (such as constants), as the source of its coordinate and angle reference
values. In addition, it can use images from different cameras having different
X– and Y–axis orientations in the image field than the tool(s) to which the
position compensation is applied.
A build reference tool uses a series of “formulas” to derive its coordinate and
angle reference values. A separate formula is used to derive each of these
values. Each formula is entered and configured using the same formula entry
keyboard that is used with a math tool. A build reference tool can be
configured to use any of the three references alone, or together in any
combination.
In some applications, tool results data derived from formulas can be used
directly as reference coordinates and/or angles. In other applications, results
data must be manipulated mathematically before being used as references.
Once the required formulas are configured, a build reference tool “learns” the
initial or “nominal” X–axis, Y–axis, and/or the “theta” angle values, like a
conventional reference tool, in order to provide shift and/or rotation
compensation to other tools. After “learning” these nominal values, a build
reference tool operates exactly like a conventional reference tool; that is, it
supplies shift and/or rotation compensation to tools that follow it in the
toolset edit panel.
After selecting a build reference tool in a toolset edit panel, you can
configure it for an inspection application by picking the
Build Reference
field in the toolset edit panel. When you pick Build Reference , the build
reference tool edit panel appears on the screen, as shown by the example in
Figure 6.54 (page 6–65). (Note that the build reference tool name also
appears, and it is shown in its default position on the screen.)
The build reference tool edit panel (named Edit “Toolset 1.Tool 1 ” in
Figure 6.54) contains several data fields and buttons, which are described
briefly as follows:
•
X Mode –– This field selects the mode for the X–axis coordinate
calculation as
Absolute , Delta , or Disabled .
•
Y Mode –– This field selects the mode for the Y–axis coordinate
calculation as
Absolute , Delta , or Disabled .
Build Reference Tool