Assignment definition

This section is about the assignment syntax and examples of structured text (ST) language. The expression can be a call to a function.
Properties of assignment statements
Item
Description
Name
:=
Meaning
Assigns a variable to an expression.
Syntax
<variable> := <any_expression> ;
Operands
The variable must be an internal or output variable and the expression must have the same type.

ST examples

(* ST program with assignments *)

(* variable <<= variable *)
bo23 := bo10;


(* Variable <<= expression *)

bo56 := bx34 OR alrm100 & (level >= over_value);
result := (100 * input_value) / scale;


(* assignment with function call *)
limited_value := min (16, max (0, input_value) );
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