HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 416)

Programming: Multiple axis machining
12.4 Miscellaneous functions for rotary axes
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
Reducing display of a rotary axis to a value less than
360°: M94
Standard behavior
The TNC moves the tool from the current angular value to the
programmed angular value.
Example:
Current angular value: 538°
Programmed angular value: 180°
Actual distance of traverse: -358°
Behavior with M94
At the start of block, the TNC first reduces the current angular
value to a value less than 360° and then moves the tool to the
programmed value. If several rotary axes are active, M94 will
reduce the display of all rotary axes. As an alternative you can enter
a rotary axis after M94. The TNC then reduces the display only of
this axis.
Example NC blocks
To reduce display of all active rotary axes:
N50 M94 *
To reduce display of the C axis only:
N50 M94 C *
To reduce display of all active rotary axes and then move the tool in
the C axis to the programmed value:
N50 G00 C+180 M94 *
Effect
M94 is effective only in the block in which it is programmed.
M94 becomes effective at the start of block.