Reference window tool – Rockwell Automation 5370-CVIM2 Module User Manual

Page 185

Chapter 6

Reference Tools

6–26

— For three–axis operations (

′

, X then Y

and

′

, Y then X

), it is the X

coordinate of the intersection of lines drawn through the three
reference features, as shown in Figure 6.21 (page 6–24).

•

Y –– This returns the current Y coordinate of the principal reference
point, as follows:

— For one–axis operations (

X only

and

Y only

), it is the Y coordinate of

the single reference feature.

— For two–axis operations (

X then Y

and

Y then X

), it is the Y

coordinate of the intersection of horizontal and vertical lines drawn
through the two reference features, as shown in Figure 6.20 (page
6–23).

— For three–axis operations (

′

, X then Y

and

′

, Y then X

), it is the Y

coordinate of the intersection of lines drawn through the three
reference features, as shown in Figure 6.21 (page 6–24).

•

Theta –– When a three–axis reference line tool is used, this returns the
current value of the rotation angle, in degrees, between a line connecting
the reference features on the X and X’ (or Y and Y’) and the 0

° X–axis of

the image field. When a one– or two–axis reference line tool is used,
Theta always returns

0.000

•

nX –– This returns the change from the nominal or “learned” X
coordinate of the principal reference point.

•

nY –– This returns the change from the nominal or “learned” Y
coordinate of the principal reference point.

•

nTheta –– This returns the change from the nominal or “learned” value
of the rotation angle, in degrees, when a three–axis reference line tool is
used. When a one– or two–axis reference line tool is used,

nTheta always

returns

0.000

•

Xc –– This returns the same value as X.

•

Yc –– This returns the same value as Y.

This section discusses the reference window tool and the shift and rotation
compensation that it can provide to other tools.

Reference Window Tool: Basic Elements

A reference window tool consists of a number of basic elements, which are
described briefly as follows:

Reference window tool –– This term refers to the whole reference window
tool; that is, each instance of “

Ref. Window

” in the toolset edit panel. Each

reference window tool consists of two separately configurable “features,”
Feature A and Feature B.

Reference Window Tool