HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 366)

366 Fundamentals of cycles
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Calling cycles
The following cycles become effective automatically as soon as they
are defined in the part program. These cycles cannot and must not be
called:
 Coordinate transformation cycles
 Cycle 9 DWELL TIME
 All touch probe cycles
You can call all other cycles with the functions described as follows.
Prerequisites
The following data must always be programmed before a
cycle call:
 BLK FORM for graphic display (needed only for test
graphics)
 Tool call
 Direction of spindle rotation (M functions M3/M4)
 Cycle definition (CYCL DEF)
For some cycles, additional prerequisites must be
observed. They are detailed in the descriptions for each
cycle.