HEIDENHAIN TNC 335 Technical Manual - Manual (Page 172)

8/95
TNC 360 3 Servo Positioning of the NC Axes 4-75
3.6.2 Axes in position
If the axes have reached the defined positioning window (MP1030, see section "Positioning
window") after a movement, the "axis in position" markers are set by the NC. This also happens
after switching on the control voltage.
The markers will be reset by the NC only if the axes leave the positioning window when being
traversed in manual operation or automatic operation. This is also valid when passing over the
reference marks. In the "Electronic handwheel" mode of operation the markers M2008 to M2011 are
reset.
The markers also inform the PLC when an axis should be moved. A positioning block resets the
corresponding in-position marker. This makes it possible to unclamp the axis and close the control
loop.
For contours which can be machined with constant feed rate the "Axis in position" markers are not
set.
Marker Function Set Reset
M2008 X axis in position NC NC
M2009 Y axis in position
M2010 Z axis in position
M2011 4th axis in position