Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK User Manual download pdf (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

, Y

, X

, Y

), where X

and Y

are assumed to be the x- and y-coordinates of the first point, and X

and Y

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

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 88 89

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