Siemens SINUMERIK 840D sl Function Manual page 843

12.2.3 Special reactions during asynchronous oscillation
With PLC control
The PLC program can take over the control of an oscillation axis via VDI signals. These VDI
signals also include program end, operating mode changeover and single block.
The following VDI interface signals are ignored in SW 6.2 and earlier: Feed/spindle stop and
NC-STOP; the resulting deceleration request is suppressed in the case of delete distance-to-
go.
In SW 6.3 and later, an asynchronous reciprocating axis interpolated by the main run reacts
to NCSTOP, alarm handling, end of program, program control and RESET.
The PLC controls the axis/spindle via the axial VDI interface (PLC→NCK) by means of the IS
DB31, ... DBX28.7 ("PLC controls axis") == 1
For further information about axes with PLC control, please see:
References:
/FB2/ Function Manual, Extended Functions; Positioning Axes (P2)
Without PLC control
If the PLC does not have control over the axis, then the axis is treated like a normal
positioning axis (POSA) during asynchronous oscillation.
Delete distance-to-go
Channel-specific delete distance-to-go is ignored. Axial delete distance-to-go:
Without PLC control
If the oscillation axis is not under PLC control, it is stopped by means of a braking ramp.
With PLC control
In this case, deceleration is suppressed and must be initiated by the PLC.
The following applies to both cases: After the axis has been stopped, the appropriate
reversal point is approached (see OSCILL_CONTROL_MASK, Chapter 4) and the distance-
to-go deleted. The sparking-out strokes are then executed and the end position is
approached if this has been set as such in OSCILL_CONTROL_MASK.
The oscillation movement is then finished.
Note
During grinding, the calipers can be put into action via axial delete distance-to-go.
EMERGENCY STOP
In the event of an EMERGENCY STOP, the axis is decelerated by the servo (by cancellation of
servo enable and follow-up). The oscillation movement is thus terminated and must be
restarted if necessary.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Oscillation (P5)
Asynchronous oscillation
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