Rockwell Automation Logix5000 Controllers Structured Text Programming Manual - Manual (Page 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