Operator - force the evaluation order in a complex expression.

Remarks

Parenthesis are used in ST and IL language for changing the default evaluation order of various operations within a complex expression. For instance, the default evaluation of "2 * 3 + 4" expression in ST language gives a result of 10 as "*" operator has highest priority. Changing the expression as "2 * ( 3 + 4 )" gives a result of 14. Parenthesis can be nested in a complex expression.

Below is the default evaluation order for ST language operations (first is highest priority):

Unary operators:      -  NOT
Multiply/Divide:        * /
Add/Subtract:         + -
Comparisons:         < > <= >= = <>
Boolean And:         & AND
Boolean Or:           OR
Exclusive OR:        XOR

ST Language

Q := (IN1 + (IN2 / IN 3)) * IN4;

FBD Language

Not available.

LD Language

Not available.

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