Rockwell Automation 5370-CVIM2 Module - Manual (Page 182)

5 Chapter Chapter 6
Reference Tools
6–23
If one axis is used (X only or Y only), the “learned” X and Y coordinates
appearing in the
Nominal field identify the location of the reference feature.
The angle (
q) is always 0.000.
If two axes are used (X then Y or Y then X), the “learned” X and Y
coordinates appearing in the
Nominal field identify the location of the
intersection of a horizontal line drawn through the Y–axis reference feature
and a vertical line drawn through the X–axis reference feature. The angle (
q)
is always 0.000. Figure 6.20 illustrates the intersection of the two lines.
Figure 6.20 Example: “Learned” Coordinates With Two–Axis Reference Line
If three axes are used (X’, X then Y or Y’, Y then X), the “learned” X and Y
coordinates appearing in the
Nominal field identify the location of the
intersection of a line drawn through the two X–axis reference features (for
X’, X then Y) and a second line drawn through the Y–axis reference feature
and perpendicular to the first line. Figure 6.21 (A) on page 6–24 illustrates
the right angle intersection of the two lines.
The “learned” angle (
q) in the
Nominal field indicates the clockwise rotation
of a line drawn through the two X–axis reference features (again, for X’, X
then Y in this case) relative to the 0
° axis of the image field. Figure 6.21 (B)
on page 6–24 illustrates the how the rotation angle is determined. Note that
this result is true when the X axis lies closer to the intersection than the X’
axis. If the positions of these two axes were reversed, the angle (
q) would be
180
° clockwise from the 72.9° in this example, or 252.9°.