HEIDENHAIN iTNC 530 407
12.4 Miscellaneous Functions for Rotary Axes
Shorter-path traverse of rotary axes: M126
Standard behavior
The standard behavior of the TNC while positioning rotary axes whose
display has been reduced to values less than 360° depends on
Machine Parameter 7682. MP7682 sets whether the TNC should
consider the difference between nominal and actual position, or
whether the TNC should always (even without M126) choose the
shortest path to the programmed position. Examples:
Behavior with M126
With M126, the TNC will move the axis on the shorter path of traverse
for rotary axes whose display is reduced to values less than 360°.
Examples:
Effect
M126 becomes effective at the start of block.
To cancel M126, enter M127. At the end of program, M126 is
automatically canceled.
Actual position Nominal position Traverse
350° 10° –340°
10° 340° +330°
Actual position Nominal position Traverse
350° 10° +20°
10° 340° –30°
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