Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario descargar pdf (Pagina 44)

Chapter 4

Defining Formulas

4–29

When the value of GAGE2.3 is positive, the conditional expression

(GAGE2.3 < 0) equals 0, so that 0 is added to the arctangent value.

Note that the previous example formula does not provide positive angular

measurements for arctangent values between 0° and –90° (see Figure 4.15),

which would correspond to positive angular measurements from 270° to

360°. In order to supply values from 270° to 360° rather than values 0° to

–90° , you could redefine the formula to also conditionally add 360:

ARC TAN(GAGE2 / GAGE2.3) + 180 *(GAGE2.3 < 0) + 360 * (GAGE2.3>0 AND GAGE2 < 0)

If the value of GAGE2.3 is positive (meaning the object is to the right of

the workpiece center), and the value of GAGE2 is negative (meaning the

object is above the workpiece center), the conditional / logical expression

(GAGE2.3>0 AND GAGE2 < 0) equals 1. The value 1 is multiplied by

360 and added to the arctangent value. As shown in Figure 4.15, the operand

GAGE2.3 would be a positive value, and the value of GAGE2 is negative,

so that 360 would be added to the arctangent value –55, for a formula result

of 305.

Figure 4.15 Example application: Finding angular results greater than 270°

q = –55° (arctangent

measure of the

object relative to the

workpiece center)

Angle of object, relative to

workpiece center (305

°)

Statistical Operators

This section discusses the statistical operators, which include AVG (average),

MAX (maximum), MED (median), MIN (minimum), MOD (mode), and VAR

(variance).

Format/Usage: To use any of the statistical operators, enter the respective

operator (AVG, MED, etc.) – which includes the open parenthesis “(” – then

enter the operand or expression, and then enter the close parenthesis “).”

The statistical operators can be used with 1) single operands, 2) operator/

operand expressions, such as arithmetic expressions, 3) parenthetical

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Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario Pagina 44