Siemens SINUMERIK 840D sl Function Manual page 696

P5: Oscillation
12.2 Asynchronous oscillation
Reversal feed
The reversal feed can also be used for oscillation axes.
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
keys) before or in the course of an oscillation movement, regardless of whether the
oscillation movement has been interrupted or not.
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 NC/PLC interface signal DB21, ...
DBX0.3 ("Activate DRF") is 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
696
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.
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions