Programming And Activating Handwheel Override - Siemens SINUMERIK 840D sl Function Manual

NC Stop/override = 0
If the feedrate override is set to 0% or an NC Stop is initiated while the handwheel override is
active, the following applies:
● For path definition:
● For velocity specification:
4.5.2

Programming and activating handwheel override

General information
When the handwheel override is programmed with NC language elements FD (for path axes)
and FDA (for positioning axes), the following points must be observed:
● FDA and FD function non-modally.
● When the handwheel override is activated with FDA or FD, a target position must be
● It is not possible to program FDA and FD or FA and F in the same NC block.
● The positioning axis must not be an indexing axis.
Positioning axis
Syntax for handwheel override:
Example 1:
Activate velocity override
N10 POS[U]=10 FDA[U]=100 POSA[V]=20 FDA[V]=150 . . .
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
The handwheel pulses arriving in the meantime are summated and stored. If NC Start or
the feedrate override > 0%, the saved handwheel pulses become effective (i.e., are
traversed).
If, however, the handwheel is deactivated prior to this
(DB21, ... DBB12/16/20 (activate handwheel n)),
the saved handwheel pulses are deleted.
The handwheel pulses arriving in the meantime are not summated and are not active.
Exception for positioning axes: If traverse instruction POSA is programmed, the
handwheel override can also act modally because this positioning axis does not affect the
block transition.
programmed in the NC block for the positioning axis or for a path axis. When the
programmed target position is reached, the handwheel override becomes inactive again.
H1: Manual travel and handwheel travel
4.5 Handwheel override in automatic mode
FDA[AXi] = [feedrate value]
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