Siemens SINUMERIK 840D sl Function Manual page 721

Note
The initial setting of the G group with G601, G602 and G603 (G group 12) is defined via
machine data:
MD20150 $MC_GCODE_RESET_VALUES[11]
The default setting is G601.
G603
Depending on velocity and machine dynamics, approximately 3 - 5 interpolation cycles are
processed at the end of interpolation before the axes reach zero speed.
MD26018 $MC_NIBBLE_PRE_START_TIME
In conjunction with the above machine data, it is possible to delay, and therefore optimize,
the instant between reaching the end of interpolation and setting the high-speed output for
"Stroke ON".
The following setting data is available in addition to MD26018:
SD42402 $SC_NIBPUNCH_PRE_START_TIME
SD42402 can be changed from the part program and therefore adapted to the punching
process depending on the progress of the part program run.
The following applies to the delay time:
MD26018 = 0
MD26018 ≠ 0
If the "Punching with dwell time, PDELAYON" is active, then the dwell time programmed in
connection with this function is active. Neither MD26018 nor SD42402 is operative in this
case.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
→ SD42402 is operative
→ MD26018 is operative
N4: Punching and nibbling - only 840D sl
10.2 Stroke control
721