Siemens Sinumerik 840D sl Programming Manual page 510

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
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.
• Activation in synchronized action
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.
If a coupled axis grouping is activated:
•
•
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.
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
510
CAUTION
in synchronized actions
in the part program with leading axes that are not program axes in the channel of the
coupled-motion axes
Significance
No coupling active
Coupled motion active
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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