Siemens SINUMERIK 840D Function Manual page 714

H1: Manual traversing
17.13 Use of handwheels in automatic mode
DRF active
DRF must be active to allow the DRF offset to be modified by means of traversal with the
handwheel. The following requirements must be fulfilled:
● AUTOMATIC mode
● DB21, ... DBX0.3 (activate DRF) = 1
The DRF offset can be activated/deactivated for specific channels using the "program control"
function on the HMI user interface.
The HMI software then sets interface signal:
DB21, ... DBX24.3 (DRF selected) =1.
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!
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● 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 Instructions Fundamentals
● Reading the DRF offset (axis-specific)
Further information
Function description PLC
● Display of the DRF offset (axis-specific)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA