Omron CX-PROGRAMMER 5.0-FUNCTION BLOCK OPERATION Operation Manual page 164

Structured Text (ST Language) Specifications
Processing Flow Chart
Yes
Same as
selected
value 1?
No
Yes
Same as
selected
value 2?
No
Same as
Yes
selected
value n?
No
Expression m Expression n
Usage
Use the CASE statement to execute different operations depending on specified integer values.
Description
If the integer_equation matches integer_equation_value_n, expression_n is executed.
if the integer_equation does not match any of integer_equation_value_n, expression_m is executed.
Precautions
• CASE must be used together with END_CASE.
• The result of the integer_equation must be in integer format (INT, DINT, LINT, UINT, UDINT, or ULINT).
• Statements that can be used in expression_@ are assignment statements, IF, CASE, FOR, WHILE, or
REPEAT.
• Multiple statements can be executed in expression_@. Be sure to use a semicolon (;) delimiter between
multiple statements in an expression.
• Variables in integer format (INT, DINT, LINT, UINT, UDINT, or ULINT), or equations that return integer val-
ues can be specified in the integer_equation.
• When OR logic is used for multiple integers in the integer_equation_value_n, separate the numerical value
using a comma delimiter. To specify a sequence of integers, use two periods (..) as delimiters between the
first and last integers.
Examples
Example 1: If variable A is 1, variable X is substituted with numerical value 1. If variable A is 2, variable X is
substituted with numerical value 2. If variable A is 3, variable X is substituted with numerical value 3. If neither
of these cases matches, variable Y will be substituted with 0.
CASE A OF
1:X:=1;
2:X:=2;
3:X:=3;
ELSE Y:=0;
END_CASE;
Expression 2 Expression 1
Appendix B
149