HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 204)

Fixed Cycles: Contour Pocket
7.10 CONTOUR TRAIN DATA (Cycle 270, DIN/ISO: G270, software option
19)
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TNC 620 | User's Manual Cycle Programming | 2/2015
7.10 CONTOUR TRAIN DATA (Cycle 270,
DIN/ISO: G270, software option 19)
Please note while programming:
You can use this cycle to specify various properties of Cycle 25
CONTOUR TRAIN.
Cycle 270 is DEF active, which means that it
becomes effective as soon as it is defined in the part
program.
If Cycle 270 is used, do not define any radius
compensation in the contour subprogram.
Define Cycle 270 before Cycle 25.