HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual page 203

7.10 CONTOUR DATA (Cycle 270,
DIN/ISO: G270)
Please note while programming:
If desired, you can use this cycle to specify various properties of Cycle
25, CONTOUR TRAIN.
Before programming, note the following:
Cycle 270 is DEF active, which means that it becomes
effective as soon as it is defined in the part program.
The TNC resets Cycle 270 as soon as you define another
SL cycle (with the exception of Cycle 25).
If Cycle 270 is used, do not define any radius
compensation in the contour subprogram.
Approach and departure properties are always performed
identically (symmetrically) by the TNC.
Define Cycle 270 before Cycle 25.
HEIDENHAIN iTNC 530 203