HEIDENHAIN iTNC 530 User Manual page 432

If the tool length compensation is calculated by the TNC, the
programmed feed rate refers to the point of the tool. Otherwise it
refers to the tool datum.
If your machine tool is equipped with a swivel head that
can be tilted under program control, you can interrupt
program run and change the position of the tilted axis, for
example with the handwheel.
With the RESTORE POS. AT N function, you can then
resume program run at the block at which the part
program was interrupted. If M114 is active, the TNC
automatically calculates the new position of the tilted axis.
If you wish to use the handwheel to change the position
of the tilted axis during program run, use M118 in
conjunction with M128.
Effect
M114 becomes effective at the start of block, M115 at the end of
block. M114 is not effective when tool radius compensation is active.
To cancel M114, enter M115. At the end of program, M114 is
automatically canceled.
432 Programming: Multiple Axis Machining