Constraints - Siemens SINUMERIK 840DE sl Function Manual

M1: Kinematics transformation
2.1 TRANSMIT face end transformation (option)
2.1.4

Constraints

Look Ahead
All functions requiring Look Ahead (traversal through pole, Look Ahead) work satisfactorily only
if the relevant axis motions can be calculated exactly in advance. With TRANSMIT, this applies
to the rotary axis and the linear axis perpendicular to it. If one of these axes is the positioning
axis, then the Look Ahead function is deactivated by alarm 10912 and the conventional online
velocity check activated instead.
Selection of method
The user is responsible for making the optimum choice of "Traversal through pole" or "Rotation
around pole".
Several pole traversals
A block can traverse the pole any number of times (e.g. programming of a helix with several
turns). The part program block is subdivided into a corresponding number of sub-blocks.
Analogously, blocks which rotate several times around the pole are likewise divided into sub-
blocks.
Rotary axis as modulo axis
The rotary axis can be a modulo rotary axis. However, this is not a mandatory requirement as
was the case in SW 2 and 3. The relevant restrictions applying in SW 2 and 3 have been
eliminated.
Rotary axis as spindle
If the rotary axis without transformation is used as a spindle, it must be switched to position-
controlled mode with SPOS before the transformation is selected.
TRANSMIT with supplementary linear axis
With active TRANSMIT, the channel name of posBCS[ax[3]] must have another name in the part
program, like the geometry axes. If posBCS[ax[3]] is written only outside the TRANSMIT
transformation, this restriction does not apply if the axis has been assigned to a geometry axis.
With active TRANSMIT, no contour information is processed via ax[3].
REPOS
It is possible to reposition on the sub-blocks produced as a result of the extended TRANSMIT
function in SW 4. In this case, the control uses the first sub-block that is closest to the
repositioning point in the BCS.
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Function Manual, 06/2019, A5E47435470B AA
Transformations