Siemens SINUMERIK 840D Function Manual page 717

The PLC program (basic PLC program or user program) transfers this interface signal to
interface signal
DB21, ... DBX0.3 (activate DRF) once the corresponding logic operation has been performed.
Control of DRF offset
The DRF offset can be modified, deleted or read:
User:
Part program:
PLC user program:
HMI user interface:
Note
If DRF offset is deleted, the axis is not traversed!
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
17.13 Use of handwheels in automatic mode
● Traversing with the handwheel
● Reading via axis-specific system variable $AC_DRF[<axis>]
● Deleting via parts-program command (DRFOF) for all axes in a
channel
● Non-modal suppression via parts-program command (SUPA)
Further information
Programming Manual Fundamentals
● Reading the DRF offset (axis-specific)
Further information
Function Manual PLC
● Display of the DRF offset (axis-specific)
H1: Manual traversing
717