Siemens SINUMERIK 840D sl Programming Manual page 128

Fundamentals
2.7 Feed control
Positioning axes
In the case of positioning axes, the travel path or velocity can be overlaid as an axial value. The
handwheel assigned to the axis is evaluated.
● Path override
The handwheel pulses evaluated dependent on the direction of rotation correspond to the
axis path to be traveled. Only handwheel pulses in the direction of the programmed position
are evaluated.
● Velocity override
The handwheel pulses evaluated per interpolation cycle dependent on the direction of
rotation correspond to the axial velocity to be overlaid. The path velocity limit values which
can be achieved by means of handwheel override are:
– Minimum: 0
– Maximum: Machine data limit values of the positioning axis
Syntax
FD=<velocity>
FDA[<axis>]=<velocity>
Meaning
FD=<velocity>:
FDA[<axis>]=<velocity>:
<axis>:
Note
FD and FDA are non-modal.
128
Path feedrate and enabling of velocity override with
handwheel
<velocity>:
● Value = 0: Not allowed!
● Value ≠ 0: Path velocity
Axial feedrate
<velocity>:
● Value = 0: Path default with handwheel
● Value ≠ 0: Axial velocity
Axis identifier of positioning axis
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming