Oscillation Mode; Positioning Mode; General Functionality - Siemens SINUMERIK 840D Function Manual

● If the speed drops below the minimum speed
or when NC/PLC IS:
DB31, ... DBX61.4 (axis/spindle stationary)
is detected, NC/PLC IS:
DB31, ... DBX83.5 (nact = nset)
● A path operation which has started (G64, rounding), is not interrupted.
In addition, the spindle response is influenced by the following machine data:
MD35500 $MA_SPIND_ON_SPEED_AT_IPO_START (feed enable with spindle in setpoint
range).
Spindle behavior at the end of gear stage change
● NC/PLC IS:
DB31, ... DBX16.3 (gear changed)
informs the NC that the new gear stage
(NC/PLC IS DB31, ... DBX16.0-16.2 (actual gear stage A to C))
applies and oscillation mode is terminated.
In this case, it does not matter whether NC/PLC IS:
DB31, ... DBX18.5 (oscillation mode)
is still set.
The actual gear stage should correspond to the set gear stage.
The actual gear stage signaled is relevant for selection of the parameter set.
● Once the gear stage change (GSW) has been acknowledged via the PLC (DB31, ...
DBX16.3), the spindle is in speed control mode (DB31, ... DBX84.7 = 1).
If a direction of rotation (M3, M4, M5 or FC18: "Start spindle rotation") or a spindle speed (S
value) was programmed before the gear stage change, then the last speed and direction of
rotation will be reactivated after the gear stage change.
18.2.4

Oscillation mode

Oscillation mode is activated for the spindle during the gear step change.
The mode of operation is described in detail in the topic "Gear step change with oscillation
mode (Page 794)".
18.2.5

Positioning mode

18.2.5.1

General functionality

When is positioning mode used?
The spindle positioning mode stops the spindle at the defined position and activates the
position control, which remains active until it is de-activated.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
is reset (e.g. for an emergency machine strategy).
S1: Spindles
18.2 Operating modes
739