Subroutine Technique; General Information - Siemens SINUMERIK User Manual

11.16

Subroutine technique

11.16.1

General information

Usage
Basically, there is no difference between a main program and a subroutine.
Frequently recurring machining sequences are stored in subroutines, e.g. certain contour shapes. These subroutines are
called at the appropriate locations in the main program and then executed.
One form of a subroutine is the machining cycle. Machining cycles contain universally valid machining scenarios. By
assigning values via included transfer parameters, you can adapt the subroutine to your specific application.
Layout
The structure of a subroutine is identical to that of a main program (see Section "Program structure (Page 77)"). Like main
programs, subroutines contain M2 - end of program in the last block of the program sequence. This means a return to the
program level where the subroutine was called from.
End of program
The end instruction RET can also be used instead of the M2 program end in the subroutine.
The RET instruction is used when G64 continuous-path mode is not to be interrupted by a return. With M2, G64 is
interrupted and exact stop is initiated.
See the following example of a sequence when a subroutine is called in a two-channel manner:
Subroutine name
The subprogram is given a unique name allowing it to be selected from several subroutines. When you create the program,
the program name may be freely selected provided the following conventions are observed:
The same rules apply as for the names of main programs.
Example: BUCHSE7
It is also possible to use the address word L... in subroutines. The value can have 7 decimal places (integers only).
Please observe: With address L, leading zeros are meaningful for differentiation.
Example: L128 is not L0128 or L00128.
These are 3 different subroutines.
Note: The subroutine name LL6 is reserved for tool change.
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