HEIDENHAIN TNC 410 ISO Programming - Manual (Page 191)

HEIDENHAIN TNC 410, TNC 426, TNC 430 165
7.
5 Mis
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ellaneous
F
unctions
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r R
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tary Ax
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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° is dependent on
Machine Parameter 7682. In Machine Parameter 7682 is set 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 traverse to the programmed position.
Examples:
Behavior with M126
With M126, the TNC will move the axis on the shorter path of traverse
if you reduce display of a rotary axis to a value 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°