Siemens SIMATIC S7-1200

Basic instructions
8.8 Program control operations
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
325
8.8.10.9
GOTO statement
Table 8- 165 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.
Example: GOTO statement
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;
8.8.10.10
RETURN statement
Table 8- 166 RETURN instruction
SCL
Description
RETURN;
The Return instruction exits the code block being executed without conditions. Program execu-
tion returns to the calling block or to the operating system (when exiting an OB).
Example: RETURN instruction:
IF "Error" <> 0 THEN
RETURN;
END_IF;
Note
After executing the
last instruction, the code block automatically returns to the calling block.
Do not insert a RETURN instruction at the end of the code block.