Siemens SINUMERIK 840D sl Function Manual page 296

Manual and Handwheel Travel (H1)
4.4 Handwheel travel in JOG
Example: Path override of the PLC axis
Assumption:
Channel 1: Handwheel 2 is assigned to machine axis 4.
If an axis movement with path override of the 4th machine axis triggered by FC18 is
processed in the main run, machine axis 4 cannot be traversed with DRF. This means that if
the channel-specific DRF signal is active, alarm 14320 (Handwheel 2 used twice (9) in
channel 1 axis A) is signaled.
If machine axis 4 is traversed with DRF, then no axis movement with path override triggered
by FC18 can be executed while a DRF movement is being performed. Alarm 14320
(Handwheel 2 used twice (4) in channel 1 axis A) is signaled.
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Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions