Rockwell-automation Logix5000 Controllers Structured Text Programming Bedienungsanleitung PDF herunterladen (Seite 21)

Publication 1756-PM007D-EN-P - November 2012 21

Program Structured Text Chapter 1

Constructs

Constructs can be programmed singly or nested within other constructs.

Some Key Words Are Reserved for Future Use

These constructs are not available:

• GOTO

• REPEAT

The Logix Designer application will not let you use them.

If you want to Use this construct

Do something if or when specific conditions occur IF...THEN

Select what to do based on a numerical value CASE...OF

Do something a specific number of times before doing

anything else

FOR...DO

Keep doing something as long as certain conditions are

true

WHILE...DO

Keep doing something until a condition is true REPEAT...UNTIL

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Rockwell-automation Logix5000 Controllers Structured Text Programming Bedienungsanleitung Seite 21