P5: Oscillation - only 840D sl
11.2 Asynchronous oscillation
Extended Functions
650 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
11.2.2 Asynchronous oscillation under PLC control
Activation
The function can be selected from the PLC using the following setting data in all operating
modes except for MDA Ref and JOG Ref.:
SD43780 OSCILL_IS_ACTIVE (switch-on oscillation motion)
Settings
The following criteria can be controlled from the PLC via setting data: Activation and
deactivation of oscillation movement, positions of reversal points, 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).
Supplementary conditions
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 axes always respond to the following two stop bits - regardless of whether the axis is
controlled from the PLC or not:
● DB31, ... DBX28.5 (stop at the next reversal point)
● DB31, ... DBX28.6 (stop along braking ramp)
11.2.3 Special reactions during asynchronous oscillation
With PLC control
The PLC program can assume the control of an oscillation axis via NC/PLC signals. The
NC/PLC interface signals also include end of program, operating mode change and single
block.
Using the NCU system software, an asynchronous reciprocating axis interpolated by the
main run reacts to
NC STOP, alarm handling, end of program, program control and RESET.
The PLC controls the axis/spindle via the axial NC/PLC interface (PLC→NCK) by means of
IS DB31, ... DBX28.7 (PLC controlled axis) = 1
For further information about axes with PLC control, see Section "P2: Positioning axes
(Page 599)".
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