Siemens SINUMERIK 828D Programming Manual page 500

Axis couplings
9.1 Coupled motion (TRAILON, TRAILOF)
Dynamics limit
The dynamics limit is dependent on the type of activation of the coupled axis grouping:
● Activation in part program
● Activation in synchronized action
Coupling status
The coupling status of an axis can be checked in the part program with the system variable:
$AA_COUP_ACT[<axis>]
Value
0
8
500
If activation is performed in the part program and all leading axes are active as program
axes in the activated channel, the dynamic response of all coupled-motion axes is taken
into account during traversing of the leading axis to avoid overloading the coupled-motion
axes.
If activation is performed in the part program with leading axes that are not active as
program axes in the activating channel ($AA_TYP ≠ 1), then the dynamic response of the
coupled-motion axes is not taken into account during traversing of the leading axis. This
can cause the overloading of coupled-motion axes with a dynamic response which is less
than that required for the coupling.
If activation is performed in a synchronized action, the dynamic response of the coupled-
motion axes is not taken into account during traversing of the leading axis. This can
cause the overloading of coupled-motion axes with a dynamic response which is less
than that required for the coupling.
CAUTION
If a coupled axis grouping is activated:
• in synchronized actions
• in the part program with leading axes that are not program axes in the channel of the
coupled-motion axes
it is the specific responsibility of the user/machine manufacturer to take suitable action
to ensure that the traversing of the leading axis will not cause the overloading of the
coupled-motion axes.
Significance
No coupling active
Coupled motion active
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
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