HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 144)

7 Programming: Miscellaneous functions 128
Programming M124
If in a positioning block (with the dialog ”Miscellaneous function”)
you press the soft key M124, the TNC then continues the dialog for
this block and asks for the tolerance value E.
You can also define E through Q parameters. See Chapter 10
”Programming: Q Parameters”
Effect
M124 becomes effective at the start of block. Like M112, M124 is
reset with M113.
Example NC block
N50 G01 G40 X+123.723 Y+25.491 F800 M124 E0.01 *
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Hkap7.pm6 29.06.2006, 08:06 128