Siemens sinumerik 840D sl Function Manual page 212

Detailed description
2.2 Programmable contour accuracy
RESET/end of program
On RESET/program end the response set in the following machine data for the G code
group 39 will become effective:
MD20110 $MC_RESET_MODE_MASK
(Definition of control default settings after reset/TP end)
MD20112 $MC_START_MODE_MASK
(Definition of the control default settings in case of NC start)
e.g. for programmable contour accuracies there are no particularities.
References:
/FB1/Function Description Basic Machine; Axes, Coordinate Systems, Frames (K2),
subject: Workpiecerelated actualvalue system
10
Special functions: Contour Tunnel Monitoring (K6)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0