Rockwell-automation 9301 Series RSView32 Users Guide Manual de usuario descargar pdf (Pagina 525)

100

101

14–12  RSView32 User’s Guide

Logical operators

Logical operators determine the validity of one or more statements.

There are three logical operators: AND, OR, and NOT. The operators

return a non–zero value if the expression is true, or a zero if the

expression is false.

The logical operators are:

Bitwise operators

Bitwise operators examine and manipulate individual bits within a

value.

Symbols Operator Action Example

(For these examples, tag1 = 5 and

tag2 = 7)

AND,

and Returns a 1 if the

statements to the right

and to the left of the

operator are both true.

(tag1 < tag 2) AND (tag1 == 5)

both statements are true; returns a 1

OR, || or Returns a 1 if either

the statement to the

left or to the right of

the operator is true.

(tag1 > tag2) OR (tag1 == 5)

tag1 == 5 is true; returns a 1

NOT negation Reverses the logical

value of the statement

it operates on.

NOT(tag1 < tag2)

although tag1 < tag2 is true, NOT reverses

the logical value; returns a 0

The parentheses are essential in the above expressions. See

“Evaluation order of operators” on page 14-22.

IMPORTANT

These operators are for integers only, not floating point numbers.

IMPORTANT

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