Goto Statement; Return Statement - Siemens SIMATIC S7-1200 System Manual

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GOTO statement

Table 8- 165 GOTO statement

GOTO JumpLabel;

JumpLabel: Statement;

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

CASE "Tag_value" OF

1 : GOTO MyLabel1;

2 : GOTO MyLabel2;

ELSE GOTO MyLabel3;

MyLabel1: "Tag_1" := 1;

MyLabel2: "Tag_2" := 1;

MyLabel3: "Tag_4" := 1;

Table 8- 166 RETURN instruction

Example: RETURN instruction:

IF "Error" <> 0 THEN

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.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

The GOTO statement skips over statements by jumping to a label in the same

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.

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).

Basic instructions

8.8 Program control operations