Siemens SINUMERIK 840D sl Function Manual page 290

Manual and Handwheel Travel (H1)
4.4 Handwheel travel in JOG
Movement in the opposite direction
MD11310 $MN_HANDWH_REVERSE (threshold for direction change handwheel)
Depending on the machine data mentioned above, behavior for a change of traversing
direction is as follows:
● If the handwheel is moved in the opposite direction, the resulting distance is computed
● If the handwheel is moved in the opposite direction by at least the number of pulses
Acceleration
With handwheel travel, acceleration takes place according to an acceleration characteristic
defined using axial machine data (default setting of axial jerk limitation):
MD32420 $MA JOG_AND_POS_JERK_ENABLE
References:
/FB1/ Function Manual, Basic Functions; Acceleration (B2)
Response at software limit switches, working-area limitation
When axes are traversed in JOG mode, they can traverse only up to the first active limitation
before the corresponding alarm is output.
MD11310 $MN_HANDWH_REVERSE (threshold for direction change handwheel)
Depending on the above machine data, the behavior is as follows (as long as the axis on the
setpoint side has not yet reached the end point):
● The distance resulting from the handwheel pulses forms a fictitious end point which is
● All handwheel pulses leading to an end point behind the limitation are ignored. Any
Limitations
The limitations are also active when traversing with the handwheel.
For more information, see "Monitoring functions".
290
and the calculated end point is approached as fast as possible.
If this end point is located before the point where the moving axis can decelerate in the
current direction of travel, the unit is decelerated and the end point is approached by
moving in the opposite direction. If this is not the case, the newly calculated end point is
approached immediately.
indicated in the machine data, the axis is decelerated as fast as possible and all pulses
received until the end of the interpolation are ignored.
This means another movement takes place only after the axis reaches zero speed
(setpoint side).
used for subsequent calculations.
If this fictitious end point is positioned, for example, 10 mm behind the limitation, these
10 mm must be traversed in the opposite direction before the axis traverses again. If a
movement in the opposite direction is to be performed immediately after a limitation is
reached, the fictitious distance-to-go can be deleted via delete distance-to-go or
deselection of the handwheel assignment.
movement of the handwheel in the opposite direction leads to an immediate movement in
the opposite direction, i.e., away from the limitation.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions