HEIDENHAIN ITNC 530 - 6-2010 DIN-ISO PROGRAMMING User Manual page 316

Restrictions
After an external or internal stop, you can only re-enter the contour
with the function RESTORE POS. AT N. Before you start the block
scan, you must cancel M120, otherwise the TNC will output an error
message.
When using the path functions G25 and G24, the blocks before and
after G25 or G24 must contain only coordinates in the working plane.
Before using the functions listed below, you have to cancel M120
and the radius compensation:
Cycle G60 Tolerance
Cycle G80 Working plane
PLANE function
M114
M128
M138
M144
TCPM FUNCTION (only conversational)
WRITE TO KINEMATIC (only conversational format)
316 Programming: Miscellaneous Functions