HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 272)

Programming: Subprograms and program section repeats
8.2 Subprograms
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
Calling a subprogram
Call a subprogram: Press the LBL CALL key
Enter the subprogram number of the subprogram
you wish to call. If you want to use a label name,
press the
LBL NAME soft key to switch to text
entry.
L 0 is not permitted as it is only used to call the end
of a subprogram.