Jump Destination For Program Jumps; Subroutine Technique; General Information - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

8.15.4

Jump destination for program jumps

Functionality
A label or a block number serve to mark blocks as jump destinations for program jumps. Program jumps can be used to
branch to the program sequence.
Labels can be freely selected, but must contain a minimum of 2 and a maximum of 8 letters or numbers of which the first two
characters must be letters or underscore characters.
Labels that are in the block that serves as the jump destination are ended by a colon. They are always at the start of a block.
If a block number is also present, the label is located after the block number.
Labels must be unique within a program.
Programming example
N10 LABEL1: G1 X20
N20 G0 X10 Z10
TR789: G0 X10 Z20
G0 X30 Z30
N100 G0 X40 Z40
M30
8.16

Subroutine technique

8.16.1

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 53)"). 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.
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015
;LABEL1 is the label, jump destination
;TR789 is the label, jump destination
- No block number existing
;Block number can be jump target
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