HEIDENHAIN TNC 410 ISO Programming - Manual (Page 187)

HEIDENHAIN TNC 410, TNC 426, TNC 430 161
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Input
If you enter M120 in a positioning block, the TNC continues the dialog
for this block by asking you the number of blocks LA that are to be
calculated in advance.
Effect
M120 must be located in an NC block that also contains radius
compensation G41 or G42. M120 is then effective from this block until
n radius compensation is canceled, or
n M120 LA0 is programmed, or
n
M120 is programmed without LA.
n
Call another program with %...
M120 becomes effective at the start of block.
Limitations
n
After an external or internal stop, you can only re-enter the contour
with the function RESTORE POS. AT N.
n If you are using the path functions G25 and G24, the blocks before
and after G25 or CHF must contain only coordinates of the working
plane.