Rockwell-automation Logix5000 Controllers Structured Text Programming Uživatelský manuál stáhnout pdf (Strana 25)

Publication 1756-PM007D-EN-P - November 2012 25

Program Structured Text Chapter 1

CASE...OF

Use CASE to select what to do based on a numerical value.

Operands:

Structured Text

Description: The syntax is:

Operand Type Format Enter

numeric_

expression

SINT

INT

DINT

REAL

Tag

Expression

Tag or expression that evaluates to a

number (numeric expression)

selector

SINT

INT

DINT

REAL

Immediate Same type as

numeric_expression

IMPORTANT

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.

CASE numeric_expression OF

selector1: statement;

selectorN: statement;

ELSE

statement;

END_CASE;

CASE numeric_expression OF

Specify as many

alternative selector

values (paths) as you

need

selector1 : <statement>;

Statements to execute when

numeric_expression = selector1

selector2 : <statement>;

Statements to execute when

numeric_expression = selector2

selector3 : <statement>;

Statements to execute when

numeric_expression = selector3

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