ADLINK Technology cPCI-8168, Руководство пользователя

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50 Operation Theory
The speed ratio along X-axis and Y-axis is (?X: ?Y), respectively,
and the vector speed is:
When calling 8-axis linear interpolation functions, the vector speed
needs to define the start velocity, StrVel, and maximum velocity,
MaxVel.
4.2.8 Two axes circular interpolation mode
Circular interpolation means XY axes simultaneously start from an
initial point, (0,0) and stop at an end point,(1800,600). The path
between them is an arc, and the MaxVel is the tangential speed.
Notice that if the end point of the arc is not at a proper position, it
will move circularly without stopping.
The motion controller will move to the desired final point even if
this point is not on the path of arc. If the final point is not located in
the shadow area of the following graph, it will run circularly without
stopping.