Case; Structured Text - Allen-Bradley Logix5000 Reference Manual

Appendix C Structured Text Programming
CASE...OF
CASE numeric_expression OF
selector1: statement;
selectorN: statement;
ELSE
statement;
Description:
Specify as many alternative
selector values (paths) as
you need.
optional
684
Use CASE to select what to do based on a numerical value.
Operands:

Structured Text

Operand
Numeric_
expression
Selector
IMPORTANT
The syntax is described in the table.
CASE numeric_expression OF
selector1 : <statement>;
selector2 : <statement>;
selector3 : <statement>;
ELSE
END_CASE;
See the table on
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
SINT Tag
INT expression
DINT
REAL
SINT Immediate
INT
DINT
REAL
If you use REAL values, use a range of values for a selector
because a REAL value is more likely to be within a range of
values than an exact match of one, specific value.
.
.
.
.
.
.
.
.
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<statement>;
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.
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page 686 for valid selector values.
Enter
Tag or expression that evaluates to a number
(numeric expression)
Same type as numeric_expression
Statements to execute when
numeric_expression = selector1
Statements to execute when
numeric_expression = selector2
Statements to execute when
numeric_expression = selector3
Statements to execute when
numeric_expression ≠ any selector