Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario descargar pdf (Pagina 23)

Chapter 4

Defining Formulas

4–8

Results Display: When you pick the Ret key, and the formula is saved,

the current result of the formula is listed in the keyboard display area:

The result format is either integer, or fixed decimal point, depending on

the requirements of the operator(s) and/or operand(s) in the formula.

Question mark (?) – incorrect syntax: The question mark (?) in the

display, when present during formula entry, indicates that the formula is

incomplete as entered, and/or that the syntax for one or more of the

formula components is incorrect:

If you pick the Ret key while a (?) appears in the display, this warning

message appears at the top of the screen:

To avoid losing your current formula entry, pick any key besides the Ret

key (other than Clr or Esc). Otherwise, picking the Ret key at this point

will clear the formula entry.

• Using parentheses in formulas: Parentheses can be used when entering

formulas, in two different ways –

Prioritizing operations – You can place parentheses around an operator

and its operands in order to prioritize that operation – that is, the

operation in parentheses can be used as an operand by another operator.

“Nesting” of operations within a formula can be employed, where a

parenthetical portion is itself contained within another parenthetical

portion of the formula.

Listing operands – Some operators require that you enter one or more

operands in a parenthetical list following the operator. In these cases,

when you pick the operator, the “open” parenthesis is displayed. After

you list the operand or operands (separated by commas), you then enter

the “close” parenthesis.

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Rockwell-automation 5370-CMPK Color CVIM Module MATH-PAK Manual de usuario Pagina 23