Rockwell-automation Logix5000 Controllers Structured Text Programming Manual do Utilizador descarregar pdf (Página 26)

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

Chapter 1 Program Structured Text

The syntax for entering the selector values is:

The CASE construct is similar to a switch statement in the C or C++

programming languages. However, with the CASE construct the controller

executes only the statements that are associated with the first matching

selector value. Execution always breaks after the statements of that selector

and goes to the END_CASE statement.

Arithmetic Status Flags: Not affected

Fault Conditions: None

Example

optional

ELSE

<statement>;

Statements to execute when

numeric_expression ¼ any

selector

END_CASE;

When selector is Enter

One value value: statement

Multiple, distinct values value1, value2, valueN : <statement>

Use a comma (,) to separate each value.

A range of values value1...valueN : <statement>

Use two periods (..) to identify the range.

Distinct values plus a range

of values

valuea, valueb, value1...valueN : <statement>

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Rockwell-automation Logix5000 Controllers Structured Text Programming Manual do Utilizador Página 26