REPEAT statement

This section is about REPEAT statement syntax and examples.
IMPORTANT: Input variables are not refreshed during REPEAT iterations. The state change of an input variable cannot be used to describe the ending condition of a REPEAT statement. Using an input variable in this manner might cause unexpected controller behavior.
Properties of REPEAT statement
Item
Description
Name
REPEAT ... UNTIL ... END_REPEAT
Meaning
Iteration structure for a group of ST statements.
The "continue" condition is evaluated after any iteration.
Syntax
REPEAT
    <statement> ;
    <statement> ;
...
UNTIL <Boolean_condition>
END_REPEAT ;

Example

(* ST program using REPEAT statement *)

(* this program uses specific "C" functions to read characters *)
(* on a serial port *)

str := ''; (* empty string *)
nbchar := 0;
IF ComIsReady ( ) THEN
REPEAT
str := str + ComGetChar ( );
nbchar := nbchar + 1;
UNTIL ( (nbchar >= 16) OR NOT (ComIsReady ( )) )
END_REPEAT;
END_IF;
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