Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario descargar pdf (Pagina 37)

Chapter 4

Defining Formulas

4–22

Subtraction example: The following formula uses the subtraction operator to

find the difference between two gage measurements:

GAGE2 – GAGE1

In this example, each of two gages is set to measure the X position of the

center of an object (see Figure 4.8). Two gages are used, because the objects

being measured are of different colors, so each of the two gages is assigned

the appropriate color. The above formula subtracts the gage 1 result from the

gage 2 result, yielding the horizontal distance between the two objects.

Figure 4.8 Example application, using the subtraction operator

Gage 1

Gage 2

Unary minus operator: 

Format/Usage: The unary minus operator (

 ) negates the value to its

immediate right in the formula. The unary minus operator can be used with

1) operands, including parenthetical expressions, and 2) operator/operand

portions of the formula – that is, operators of the type that are followed by a

parenthetical listing of operands.

Formula symbol: When you pick the

 key to enter the unary minus into a

formula, the “–” (minus) symbol is entered. Take care not to confuse this

with the subtraction operator, which looks the same when entered.

Example usage: Use the

 operator to negate the value of an operand:

– GAGE2

GAGE3

Use the  operator to negate the value of an operator/operand:

1.250

– AVG (GAGE2, GAGE3, GAGE4)

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Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario Pagina 37