User`s manual

16-10 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
16
sectors meet are made equal. The curve-fit polynomial coefficients for the two adjacent segments
are calculated simultaneously.
Boundary Conditions
For non-cyclic profiles it is necessary to define some condition at the start and end of a profile for
the purpose of calculating curve-fit polynomial coefficients. The start or end boundary condition
can be:
•
The numerical value of the profile's 1
st
derivative (slope).
•
The numerical value of the profile's 2
nd
derivative.
•
Based on a default calculation.
The default calculations are as follows:
•
Start Boundary.
The slope at the start point of the profile is calculated by temporarily
fitting a polynomial curve to the first three (2
nd
order sector) or four points (3
rd
order
sector) and calculating the slope of the temporary polynomial at the first point.
•
End Boundary.
The slope at the end point of the profile is calculated by temporarily
fitting a polynomial curve to the last four points (3
rd
order sector) and calculating the slope
of the temporary polynomial at the end point.