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DMC-3425 Chapter 6 Programming Motion• 89
Contour Mode (Local Mode)
The DMC-3425 also provides a contouring mode. This mode allows any arbitrary position curve to be
prescribed for any motion axes. This is ideal for following computer generated paths such as
parabolic, spherical or user-defined profiles. The path is not limited to straight line and arc segments
and the path length may be infinite.
Specifying Contour Segments
The Contour Mode is specified with the command, CM. For example, CMAB specifies contouring on
the A and B axes. Any axes that are not being used in the contouring mode may be operated in other
modes.
A contour is described by position increments which are described with the command, CD a,b over a
time interval, DT n. The parameter, n, specifies the time interval. The time interval is defined as 2
n
ms, where n is a number between 1 and 8. The controller performs linear interpolation between the
specified increments, where one point is generated for each millisecond.
Consider, for example, the trajectory shown in Fig. 6.5. The position A may be described by the
points: