Asynchronous Oscillation - Siemens SINUMERIK 840D Function Manual

P5: Oscillation

15.2 Asynchronous oscillation

● The feedrate velocity of the oscillation axis can be altered through a value input in the NC
program, PLC, HMI or via an override. The feedrate can be programmed to be dependent
on a master spindle, rotary axis or spindle (revolutional feedrate).
Further information
V1: Feedrates (Page 125)
● The oscillation movement can be controlled entirely by the PLC.
Methods of oscillation control
There are two modes of oscillation:
1. Asynchronous oscillation:
Is active across block boundaries and can also be started from the PLC/HMI.
2. Oscillation by synchronized movement actions:
In this case the asynchronous oscillation and an infeed movement are coupled via
synchronized actions. In this way, it is possible to program oscillation with infeed at the
reversal points which is active on a non-modal basis.
15.2 Asynchronous oscillation
15.2.1 Asynchronous oscillation
Characteristics
The characteristics of asynchronous oscillation are as follows:
● The oscillation axis oscillates backwards and forwards between reversal points 1 and 2 at
the specified feedrate until the oscillation movement is deactivated or until there is an
appropriate response to a supplementary condition. If the oscillation axis is not positioned
at reversal point 1 when the movement is started, then it traverses to this point first.
● Linear interpolation G01 is active for the oscillating axis regardless of the G command
currently valid in the program. Alternately, revolutional feedrate G95 can be activated.
● Asynchronous oscillation is active on an axis-specific basis beyond block limits.
● Several oscillation axes (i.e. maximum number of positioning axes) can be active at the
same time.
● During the oscillation movement, axes other than the oscillation axis can be freely
interpolated. A continuous infeed can be achieved via a path movement or with a positioning
axis. In this case, however, there is no interpolative connection between the oscillation and
infeed movements.
● If the PLC does not have control over the axis, then the axis is treated like a normal
positioning axis during asynchronous oscillation. In the case of PLC control, the PLC
program must ensure via the appropriate stop bits of the NC/PLC interface that the axis
reacts in the desired way to NC/PLC interface signals. These NC/PLC interface signals also
include end of program, operating mode change and single block.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA