Siemens SINUMERIK 840D sl Function Manual page 305

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:
4.4.3 Double use of the handwheel
Alarm 14320
The double use of a handwheel for DRF and velocity or path override, including contour
handwheel, is prevented and displayed via the self-acknowledging alarm 14320 (Handwheel
%1 used twice (%2) in channel %3 axis %4), if the handwheel affects an axis in different
ways.
This means that an overlaid movement can only be executed when no DRF offset (triggered
by the same handwheel) is active for the axes in the basic coordinate system that are
involved in the movement, i.e. the DRF movement must have been terminated.
If an overlaid movement has been started, no DRF offset can be started for any of the axes
involved that are supplied by the same handwheel. Such a DRF movement is only possible
when the movement with override has reached its end point or been aborted by delete
distance-to-go or RESET.
If the handwheel override and DRF offset are to be active simultaneously, this is possible
with activation of two separate handwheels.
Example: Path override
Assumption:
Channel 1 and geometry axis X correspond to machine axis 3, geometry axis Y corresponds
to machine axis 5 and handwheel 2 is selected for the first geometry axis.
If block X10 Y10 FD=0 is processed in the main run, neither machine axis 3 nor machine
axis 5 can be traversed with DRF via handwheel 2. If handwheel 2 is assigned to machine
axis 3 while the channel-specific DRF signal is active, then alarm 14320 (Handwheel 2 used
twice (8) in channel 1 axis X) is signaled.
If machine axis 3 or machine axis 5 is traversed with DRF using the second handwheel, the
movement X10 Y10 FD=0 cannot be executed and alarm 14320 (Handwheel 2 used twice
(3) in channel 1 axis X) or 14320 (Handwheel 2 used twice (3) in channel 1 axis Y) is
signaled.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Manual and Handwheel Travel (H1)
Handwheel travel in JOG
The "travel request +" PLC signal is output from
axis/spindle; no motion command + is output from
axis/spindle.
No travel request, no motion command
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