Siemens SINUMERIK 840D Function Manual page 661

MD11310 $MN_HANDWH_REVERSE (threshold for direction change handwheel)
Value
= 0
> 0
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.
Depending on the setting in the machine data:
MD11310 $MN_HANDWH_REVERSE (threshold for direction change, handwheel)
the behavior is then as follows (as long as the axis has still not arrived at the end point from the
setpoint side):
● The distance resulting from the handwheel pulses forms a fictitious end point which is used
for subsequent calculations.
If this fictitious end point is, for example, 10 mm behind the limit, 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.
● All handwheel pulses leading to an end point behind the limitation are ignored. Any
movement of the handwheel in the opposite direction leads to an immediate movement in
the opposite direction, i.e. away from the limit.
Feedrate behavior
In JOG mode, the feedrate behavior of the axis/spindle also depends on the setting data:
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
If the handwheel is moved in the opposite direction, the resulting distance is computed 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 imme‐
diately.
If the handwheel is moved in the opposite direction by at least the number of pulses 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 that another movement takes place only after the axis reaches standstill (setpoint
side).
H1: Manual traversing
17.6 Manual traversing using a handwheel
661