HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 51)

HEIDENHAIN MANUALplus 620, CNC PILOT 620/640
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MACHINING section
In the MACHINING program section you program the machining
operations. This code must be included.
END code
The END code concludes the NC program. This code must be included.
SUBPROGRAM section
If you define a subprogram within your NC program (within the same
file), it is designated with SUBPROGRAM, followed by the name of the
subprogram (max. 40 characters).
RETURN code
The RETURN code concludes the subprogram.