Siemens SINUMERIK 840D sl Function Manual page 225

The feedrate is not dependent on:
● The programmed feedrate mode (mm/min, mm/rev.)
● The programmed feedrate (resultant velocity can be higher)
● The rapid traverse velocity for G0 blocks
● The override (position 0% is effective, i.e. zero speed)
Traversing direction
The traversing direction depends on the direction of rotation:
● Clockwise
→ Results in travel in the programmed direction
If the block-change criterion (IPO end) is reached, the program advances to the next block
(response identical to G60).
● Counterclockwise
→ Results in travel opposite to the programmed direction
Here, the axes can only traverse to the appropriate block start. Pulses are not collected if
the handwheel continues to rotate.
Activation of the function
The function can be activated via interface signals or via the NC program:
● Activation via interface signal
Switching-in/switching-out is realized via the interface signal:
DB21, ... DBX30.0-2 (activate contour handwheel (1, 2, 3))
● Activation via the NC program
The contour handwheel can be activated in the NC program non-modally using FD=0, that
is, velocity F... from the block before the contour handwheel applies in the following block
without the need for additional programming.
Note
If no feedrate was programmed in the previous blocks, a corresponding alarm is output.
FD and F cannot appear in the same NC block (triggers an alarm).
Contour-handwheel simulation
When the contour handwheel is activated, it can also be simulated.
After activation via interface signal
DB21, ... DBX30.3 (contour-handwheel simulation),
the feedrate is no longer defined by the contour handwheel; the programmed feedrate is used
instead.
The direction is also defined via an interface signal:
DB21, ... DBX30.4 (negative direction simulation contour handwheel)
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
H1: Manual and handwheel travel
4.13 Use of handwheels in automatic mode
225