Siemens SINUMERIK 840D sl Function Manual page 837

Reversal points
The positions of the reversal points can be entered via setting data before an oscillation
movement is started or while one is in progress.
● The reversal point positions can be entered by means of manual travel (handwheel, JOG
The following applies to alteration of a reversal point position: When an oscillation movement
is already in progress, the altered position of a reversal point does not become effective until
this point is approached again. If the axis is already approaching the position, the correction
will take effect in the next oscillation stroke.
Note
If a reversal point must be altered at the same time as VDI interface signal
set, the handwheel signals are applied both to the DRF offset and to the offset of the
reversal point, i.e. the reversal point is shifted absolutely by an amount corresponding to
twice the distance.
Stop times
A stop time can be programmed via setting data for every reversal point.
The setting can be changed in the following blocks of the NC program. It is then effectively
block synchronous from the next reversal point.
Stop time can be changed asynchronously via setting data. It is then effective from the
instant that the appropriate reversal point is next traversed.
The following table explains the motional behavior in the exact stop range or at the reversal
point, depending on the stop time input.
Table 12- 1
Stop time setting
-2
-1
0
>0
Deactivate oscillation
One of the following options can be set for termination of the oscillation movement when
oscillation mode is deactivated:
● Termination of oscillation movement at the next reversal point
● Termination of oscillation movement at reversal point 1
● Termination of oscillation movement at reversal point 2
Following this termination process, sparking-out strokes are processed and an end position
approached if programmed.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
keys) before or in the course of an oscillation movement, regardless of whether the
oscillation movement has been interrupted or not.
Effect of stop time
Response
Interpolation continues without wait for exact stop
Wait for coarse exact stop at reversal point
Wait for fine exact stop at reversal point
Wait for fine exact stop at reversal point, followed by wait for stop time.
Oscillation (P5)
Asynchronous oscillation
"Activate DRF"
is
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