Siemens SINUMERIK 840D sl Function Manual page 294

Manual and Handwheel Travel (H1)
4.4 Handwheel travel in JOG
With velocity specification
If the handwheel is no longer moved with velocity specification
(MD11346 $MN_HANDWH_TRUE_DISTANCE == 0 or == 2),
the "travel request" PLC signal is reset.
The "travel request" PLC signal is also reset when the handwheel is deselected.
Figure 4-5
Supplementary conditions
With NC Stop present, no motion command and, therefore, no travel request is output. There
is an exception with DRF travel:
If DRF travel is permitted in the NC-Stop state via machine data
MD20624 $MC_HANDWH_CHAN_STOP_COND (bit 13 == 1),
the response corresponds to that of handwheel travel.
As for the motion command, the travel request is the sum of all the sub-movements, i.e., the
component from couplings and offset values is also taken into account.
Examples
In machine data
MD32084 $MA_HANDWH_STOP_COND (control of VDI signals relating to handwheel)
the feed stop is set as the abort criterion.
The "feed stop" PLC signal is present. Handwheel travel is selected (JOG mode, DRF travel
in AUTOMATIC mode).
The handwheel is turned in the positive direction:
The "feed stop" PLC signal is reset:
294
Signal/timing diagram, handwheel travel with velocity specification when stop condition is
abort criterion
The "travel request +" PLC signal is output from
axis/spindle; no motion command + is output from
axis/spindle.
No travel request, no motion command
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions