Siemens SINUMERIK 840D sl Function Manual page 314

H1: Manual travel and handwheel travel
4.6 Contour handwheel/path input using handwheel (option)
The direction is also defined via an interface signal:
DB21, ... DBX30.4 (contour-handwheel-simulation negative direction)
When the simulation is deselected or the direction is changed, the current movement is
decelerated using a braking ramp.
Note
The override is effective as for NC-program execution.
Secondary conditions
● Preconditions
● Limit values
● Interruption of traversing movement
● Channel-specific deletion distance-to-go
314
Fixed feedrate, dry-run feedrate, thread cutting, or tapping must not be selected.
The acceleration and velocity of the axes are limited to the values defined in the machine
data.
On NC Stop, the function remains selected but the handwheel pulses are not summated
and are ineffective.
Precondition: MD32084 $MA_HANDWH_CHAN_STOP_COND bit 2 = 1
DRF
A selected DRF function also has a path-override action.
This causes the movement triggered by the contour handwheel to be aborted; the axes
are decelerated and the program is restarted with the next NC block. The contour
handwheel then becomes effective again.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions