Omron CS1-H Series, Operation Manual

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Structured Text (ST Language) Specifications Appendix B
Processing Flow Chart
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;
Yes
Yes
Yes
No
No
No
Expression m Expression n
Expression 2
Expression 1
Same as
selected
value 1?
Same as
selected
value 2?
Same as
selected
value n?