Asynchronous Oscillation Under Plc Control - Siemens SINUMERIK 840D sl Function Manual

P5: Oscillation - only 840D sl
12.2 Asynchronous oscillation
If a non-modal oscillation process does not require an infeed motion if the start position
coincides with reversal position 1, this option can be configured with another synchronized
action, see examples in the chapter "Non-modal oscillation (starting position = reversal point 1)".
Programming example
The "Examples" chapter gives an example containing all the important elements for
asynchronous oscillation.
12.2.2

Asynchronous oscillation under PLC control

Activating
The function can be selected from the PLC via setting data OSCILL_IS_ACTIVE in all
operating modes except for MDA Ref and JOG Ref.
Settings
The following criteria can be controlled from the PLC via setting data: Activation and
deactivation of oscillation movement, positions of reversal points 1 and 2, stop times at
reversal points, feedrate velocity, the options in the reversal points, the number of sparking-
out strokes and the end position after deactivation. However, these values can also be set
beforehand as a setting data via the HMI user interface directly or via an NC program. These
settings remain valid after power ON and the PLC can also start an oscillation movement set
in this way directly via setting data OSCILL_IS_ACTIVE (via variable service).
Constraints
A spindle which must act as an axis to execute an oscillation movement started via the PLC
must fulfill the conditions required to allow traversal as a positioning axis, i.e. the spindle
must, for example, have been switched to the position control (SPOS) beforehand.
The two stop bits of the VDI interface IS DB31, ... DBX28.6 ("Stop") and IS DB31, ...
DBX28.5 ("Stop at next reversal point") are always interpreted by the axes irrespective of
whether the axis is controlled by the PLC or not.
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Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions