Siemens S7-1200 - GOTO Statement; RETURN Statement

Basic instructions
7.8 Program control operations
S7-1200 Programmable controller
274 System Manual, 03/2014, A5E02486680-AG
Use the EXIT statement within a loop. In nested loops, the EXIT statement returns the
processing to the next higher nesting level.
FOR i := 0 TO 10 DO
CASE value[i, 0] OF
1..10: value [i, 1]:="A";
11..40: value [i, 1]:="B";
41..100: value [i, 1]:="C";
ELSE
EXIT;
END_CASE;
END_FOR;
7.8.9.9
GOTO statement
Table 7- 126 GOTO statement
SCL
Description
GOTO JumpLabel;
Statement;
... ;
JumpLabel: Statement;
The GOTO statement skips over statements by jumping to a label in the same
block.
The jump label ("JumpLabel") and the
GOTO statement must be in the same block.
The name of a jump label can only be assigned once within a block. Each jump
label can be the target of several GOTO statements.
It is not possible to jump to a loop section (FOR, WHILE or REPEAT). It is possible to jump
from within a loop.
In the following example: Depending on the value of the "Tag_value" operand, the execution
of the program resumes at the point defined by the corresponding jump label. If "Tag_value"
equals 2, the program execution resumes at the jump label "MyLabel2" and skips
"MyLabel1".
CASE "Tag_value" OF
1 : GOTO MyLabel1;
2 : GOTO MyLabel2;
ELSE GOTO MyLabel3;
END_CASE;
MyLabel1: "Tag_1" := 1;
MyLabel2: "Tag_2" := 1;
MyLabel3: "Tag_4" := 1;
7.8.9.10
RETURN statement
Table 7- 127 RETURN instruction
SCL
Description
RETURN;
The Return instruction exits the code block being executed without conditions. Program
execution returns to the calling block or to the operating system (when exiting an OB).
Example of a RETURN instruction:
IF "Error" <> 0 THEN
RETURN;
END_IF;