HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 206)

206 7 Programming: Miscellaneous Functions
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Superimposing handwheel positioning during
program run: M118
Standard behavior
In the program run modes, the TNC moves the tool as defined in the
part program.
Behavior with M118
M118 permits manual corrections by handwheel during program run.
You can use this miscellaneous function by entering axis-specific
values X, Y and Z (in mm) behind M118.
Programming M118
If you enter M118 in a positioning block, the TNC continues the dialog
for this block by asking you the axis-specific values. The coordinates
are entered with the orange axis direction buttons or the ASCII
keyboard.
Effect
Cancel handwheel positioning by programming M118 once again
without X, Y and Z.
M118 becomes effective at the start of block.
Example NC blocks
If you want to be able to use the handwheel during program run to
move the tool in the working plane X/Y by ±1 mm from the
programmed value:
G01 G41 X+0 Y+38.5 F125 M118 X1 Y1 *
M118 is always effective in the original coordinate system,
even if the working plane is tilted.
M118 also functions in the Positioning with MDI mode of
operation.
If M118 is active, the MANUAL OPERATION function is
not available after a program interruption.