Siemens SINUMERIK 840D sl Function Manual page 309

Application example
The "Handwheel override in automatic mode" function is frequently used on grinding
machines. For example, the user can position the reciprocating grinding wheel on the
workpiece using the handwheel (path default). After scratching, the traversing movement is
terminated and the block change is initiated (by activating DB31, ... DBX2.2 (delete distance-
to-go)).
Preconditions
In order to activate "Handwheel override in automatic mode", the following preconditions
must have been met:
● A handwheel must be assigned to the axis in question.
● Pulse weighting exists for the assigned handwheel.
Handwheel assignment
The connected handwheels are assigned to the axes via the PLC user interface using the
DB31, ... DBX4.0 to DBX4.2 (activate handwheel)
interface signal, in a similar manner as for "handwheel travel in JOG", or using menu-
assisted operation.
If handwheel override is programmed for an axis to which no handwheel is assigned, a
distinction is made between the following cases:
● For velocity override:
● For path default:
Handwheel weighting
The traverse path of the axis that is generated by rotating the handwheel by one detent
position is dependent on several factors (see "Handwheel travel in JOG"):
● Selected increment size:
● Weighting of an increment:
● Number of handwheel pulses per detent position:
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
The axes traverse at the programmed velocity.
A self-acknowledging alarm is output (without response).
No traversing movement is performed because the velocity is zero.
A self-acknowledging alarm is output (without response).
Note
When the velocity override is applied to path axes, only the handwheel of the first
geometry axis acts on the path velocity.
MD11330 $MN_JOG_INCR_SIZE_TAB[5] (increment size for INC/handwheel)
or
SD41010 $SN_JOG_VAR_INCR_SIZE (size of the variable increment for JOG)
MD31090 $MA_JOG_INCR_WEIGHT
MD11320 $MN_HANDWH_IMP_PER_LATCH
Manual and Handwheel Travel (H1)
Handwheel override in automatic mode
309