GE 90-30/20/Micro manual LABEL

4-130 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
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LABEL
The LABEL instruction functions as the target destination of a JUMP. Use the LABEL instruction
to resume normal program execution after a JUMP instruction.
There can be only one LABEL with a particular label name in a program. Programs without a
matched JUMP/LABEL pair can be created and stored to the PLC, but cannot be executed.
Logicmaster 90-30/20/Micro software supports two forms of the LABEL function, a non-nested and
a nested form. The non-nested form, LABEL01:, must be used with the non-nested JUMP function,
——————>>LABEL01. The nested form, LABEL01:(nested), must be used with the nested
JUMP function, ———N——>>LABEL01.
The LABEL instruction has no inputs and no outputs; there can be nothing either before or after a
LABEL in a rung.
Non-nested LABEL:
???????:
???????:
Nested LABEL:
???????: (nested)
???????: (nested)
Example:
In the following examples, power flow from JUMP TEST1 is resumed, starting at LABEL TEST1.
Example of a non-nested LABEL:
|
| TEST1 :
|
Example of a nested LABEL:
|
| TEST1 :(nested)
|