Omron CX-PROGRAMMER 5.0-FUNCTION BLOCK OPERATION Operation Manual page 165

Structured Text (ST Language) Specifications
Example 2: If variable A is 1, variable X is substituted with numerical value 1. If variable A is 2 or 5, variable X
is substituted with numerical value 2. If variable A is a value between 6 and 10, variable X is substituted with
numerical value 3. If variable A is 11, 12, or a value between 15 and 20, variable X is substituted with numerical
value 4. If neither of these cases matches, variable Y will be substituted with 0.
CASE A OF
1:X:=1;
2,5:X:=2;
6..10:X:=3;
11,12,15..20:X:=4;
ELSE Y:=0;
END_CASE;
FOR Statement
Summary
This statement is used to execute a specified expression repeatedly until a variable (referred to here as an iter-
ation variable) reaches a specified value.
Reserved Words
FOR, TO, (BY), DO, END_FOR
Note BY can be omitted.
Statement Syntax
FOR <iteration_variable>:= <initial_value> TO <final_value_equation> BY
<increment_value_equation>
DO
<expression>;
END_FOR;
Processing Flow Chart
Iteration variable = Initial
Iteration
True
variable ≥
Final value?
False
Expression
Iteration variable + Increment value
End
Usage
Use the FOR statement when the number of iterations has been determined beforehand. FOR is particularly
useful when switching the number of elements in an array variable according to the value of a specified itera-
tion variable.
150
Iteration
Appendix B