HEIDENHAIN TNC 320 (77185x-01) ISO programming - Manual (Page 234)

Programming: Subprograms and program section repeats
8.2 Subprograms
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TNC 320 | User's Manual for DIN/ISO Programming | 3/2014
Calling a subprogram
To call a subprogram, Press the LBL CALL key
Label number: Enter the label 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.
If you want to enter the number of a string
parameter as target address, press the QS soft
key. The TNC will then jump to the label name that
is specified in the defined string parameter
G98 L 0 is not permitted (Label 0 is only used to
mark the end of a subprogram).