HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 330)

Programming: Miscellaneous functions
10.4 Miscellaneous functions for path behavior
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
Deleting basic rotation: M143
Standard behavior
The basic rotation remains in effect until it is reset or is overwritten
with a new value.
Behavior with M143
The TNC erases a programmed basic rotation from the NC
program.
The function
M143
is not permitted during mid-
program startup.
Effect
M143 is effective only in the block in which it is programmed.
M143 becomes effective at the start of the block.