Siemens SINUMERIK 840D sl Function Manual page 845

Single-block processing
If the axis is not controlled by the PLC, then it responds to a single block in the same way as
a positioning axis (POSA), i.e. it continues the movement.
Override
The override is specified by the:
VDI interface
Axial override acts on the oscillation axis.
Programming
The override acts on oscillation axes in the same way as on positioning axes.
Block search
In Block search the last valid oscillation function is registered and the machine data
OSCILL_MODE_MASK is activated (default) accordingly, either directly after NC start (when
approaching the start position after block search) or after reaching the start position after
block search.
OSCILL_MODE_MASK Bit 0:
0: Oscillation starts after reaching the start position.
1: Oscillation starts immediately after NC start.
REORG
Reversal point 1 is always approached first before oscillation continues.
ASUB
The oscillation movement continues while an ASUB (asynchronous subprogram) is in
progress.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Oscillation (P5)
Asynchronous oscillation
845