Status Of Coupling - Siemens SINUMERIK 840D Function Manual

M3: Coupled axes
14.1 Coupled motion
Leading axis
When a coupled axis grouping is active, the interface signals (IS) of the leading axis are applied
to the appropriate coupled motion axis via the axis coupling, i.e.
● A position offset or feed control action of the leading axis is applied via the coupling factor
to effect an appropriate position offset or feed control action in the coupled motion axis.
● Shutdown of the leading axis as the result of an interface signal (e.g. axis-specific feed stop,
axis inhibit, servo enable, etc.) causes the corresponding coupled motion axis to shut down.
Position measuring system 1/2 (DB31, ... DBX1.5/1.6))
Switch-over of the position measuring system for the leading and coupled motion axes is not
inhibited for an active coupled axis grouping. The coupling is not canceled.
Recommendation: Switch-over when the coupling is deactivated.
Tracking (DB31, ... DBX1.4)
Activation of tracking for an axis is done via the PLC program by setting the following NC/PLC
interface signals:
DB31, ... DBX2.1 = 0 (control system enable)
DB31, ... DBX1.4 == 1 (tracking mode)
When activating tracking mode for a coupled axis grouping, the specified NC/PLC interface
signals must be set simultaneously for all axes (master and slave axes) of the coupled axis
group.
If tracking mode is activated for the master axis only, a permanent offset results within the
coupling.
Whether and which axis is a leading or a following axis can be seen from the following NC/PLC
interface signals and system variables:
DB31, ... DBX99.0 (leading axis/spindel active)
DB31, ... DBX99.1 (following axis/spindel active)
$AA_COUP_ACT[axis name] (see: Status of coupling)
14.1.5

Status of coupling

The coupling status of an axis can be determined using the following system variables:
$AA_COUP_ACT [axis name]
Value
0
1, 2, 3
4
8
426
Meaning
No coupling active
Tangential tracking
Synchronous spindle coupling
Coupled motion active
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA