Rockwell Automation 5370-CMPK Color CVIM Module MATH-PAK - Manual (Page 40)

Chapter 4
Defining Formulas
4–25
operator/operand expressions, and 4) operator/operand portions of the
formula – that is, operators of the type that are followed by a parenthetical
listing of operands.
Example usage: Use the square root operator with a parenthetical expression
which adds the squares of gage 2 and gage 3, possibly to calculate a distance
(by the Pythagorean theorem):
SQR (SQ (GAGE2) + SQ (GAGE3))
Distance operator: DST
Format/Usage: The distance operator ( DST ) computes the distance between
two points, given the x- and y-coordinates of the two points.
The format for the DST operator: DST (X
1
, Y
1
, X
2
, Y
2
), where X
1
and Y
1
are assumed to be the x- and y-coordinates of the first point, and X
2
and Y
2
are assumed to be the x- and y-coordinates of the second point.
To use the distance operator, enter the DST operator – which includes the
open parenthesis “(” – then enter four operands or expressions, separated by
commas, and then enter the close parenthesis “).”
Example usage: Use the distance operator to find the distance between two
objects identified and located by two different windows:
DST (WIN1.12, WIN1.13, WIN2.12, WIN2.13)
Operands WIN1.12 and WIN1.13 indicate the x- and y-coordinates,
respectively, of the center of gravity of the object identified by color in
window 1 (see Figure 4.9). Similarly, operands
WIN2.12 and
WIN2.13 indicate the x- and y-coordinates, respectively, of the center of
gravity of the object identified by color in window 2.
Figure 4.9 Example of using the DST function
Window 1
Window 2
Distance from
window 1 object
to window 2
object
Object
identified by
color in
Window 1
Object
identified by
color in
Window 2