Asynchronous Oscillation Under Plc Control; Special Reactions During Asynchronous Oscillation - Siemens SINUMERIK 840D sl Function Manual

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Asynchronous oscillation under PLC control

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)

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)

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 653)".

Extended Functions

Function Manual, 10/2015, 6FC5397-1BP40-5BA3

P5: Oscillation

12.2 Asynchronous oscillation

Sinumerik 828d