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4. Concepts of the cam disc
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Festo.P.BE-CMMP-CAM-SW-EN en 1105a
4.9.2
Displacement plan editor <-> conventional curve creation
The function of the electronic cam disc is normally depicted by creating a value table with
the points that the drive should travel to in succession. The value table must be filled out
by hand. The question whether the acceleration and jerk values that occur will overload
the drive can only be clarified through complex individual calculations.
The Festo displacement plan editor, in contrast, makes it possible to set only central
design points by mouse-click. The remaining course of the curve is recommended by the
program. The speeds and acceleration values that occur are displayed immediately.
4.9.3
Rasterisation of the curve
The Festo displacement plan editor generates a completely smooth curve. The curve is
rasterised when closing the displacement plan editor so it can be saved and processed in
the controller. The number of sections of this grid corresponds to the “number of points”
specified when defining the curve in FCT.
Since the design points generated by mouse-click do not always lie exactly on the grid,
rough rasterisation produces only an imprecise approximation to the course of the curve of
the displacement plan editor. To keep this deviation low, using the largest possible
number of data points (=grid points) is recommended.
The following figure shows on the left a roughly rasterised curve with only 10 data points
(=grid points). The curve on the right, in contrast, has a markedly more precise course,
thanks to 200 grid points.