Siemens sinumerik 840d Programming Manual page 309

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840D 840D
NCU 571 NCU 572
NCU 573
Coupling factor
The coupling factor specifies the desired ratio of the
paths of trailing axis and leading axis.
Coupling factor =
If the coupling factor is not specified in the program,
a coupling factor of 1 is automatically taken as the
default.
The factor is entered as a decimal fraction (type
REAL). The input of a negative value causes
opposite traversing movements on the leading and
trailing axes.
Deactivate coupled axes
The following language command deactivates the
coupling with a leading axis:
TRAILOF(V,Y)
V = trailing axis, Y = leading axis
TRAILOF with 2 parameters deactivates the
coupling to only 1 leading axis.
If a trailing axis is assigned to 2 leading axes,
e.g. V=trailing axis and X,Y=leading axes,
TRAILOF can be called with 3 parameters to
deactivate the coupling:
TRAILOF(V,X,Y)
Additional notes
Acceleration and velocity
The acceleration and velocity limits of the combined
axes are determined by the "weakest axis" in the
combined axis pair.
Coupling status
You can query the status of the coupling in the NC
program with the following system variable:
$AA_COUP_ACT[axis]
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 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
9.2 Coupled motion TRAILON, TRAILOF
FM-NC 810D 840Di
Path of trailing axis
Path of leading axis
No coupling active
Coupled motion active
Path Traversing Behavior
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