Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 525)

14–12
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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