Siemens SINUMERIK 840D sl Function Manual page 290

Manual and Handwheel Travel (H1)
Continuous travel
4.2 Continuous travel
4.2.1 General functionality
Selection
In JOG mode, continuous travel must be activated via the PLC interface:
DB21, ... DBX13.6, ff (machine function: continuous)
As soon as continuous travel is active, interface signal
DB21, ... DBX41.6, ff (active machine function: continuous)
is returned to the PLC. continuous)
returned.
Traversing keys +/-
The plus and minus traversing keys are selected to move the relevant axis in the appropriate
direction. If both traversing keys are pressed simultaneously, there is no traversing
movement, or, if an axis is in motion, it is stopped.
Note
When the control is switched on, axes can be traversed to the limits of the machine because
they have not yet been referenced. This can cause emergency limit switches to be triggered.
The software limit switches and the working-area limitation are not operative.
Motion command +/-
As soon as a travel request is pending for an axis (e.g. once a traversing key has been
pressed), the
DB21, ... DBX40.7 (motion command +)
or
DB21, ... DBX40.6 (motion command -)
interface signal is output, depending on the direction of movement.
290
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions