Contour Mode
The DMC-40x0 also provides a contouring mode. This mode allows any arbitrary position curve to be prescribed
for 1 to 8 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, CMXZ specifies contouring on the X and Z
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 x,y,z,w over a time
interval, DT n. The parameter, n, specifies the time interval. The time interval is defined as 2n sample period (1 ms
for TM1000), 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 sample. If the time interval changes for each segment,
use CD x,y,z,w=n where n is the new DT value.
Consider, for example, the trajectory shown in Fig. 6.18. The position X may be described by the points:
Point 1 X=0 at T=0ms
Point 2 X=48 at T=4ms
Point 3 X=288 at T=12ms
Point 4 X=336 at T=28ms
The same trajectory may be represented by the increments
Increment 1 DX=48 Time=4 DT=2
Increment 2 DX=240 Time=8 DT=3
Increment 3 DX=48 Time=16 DT=4
When the controller receives the command to generate a trajectory along these points, it interpolates linearly
between the points. The resulting interpolated points include the position 12 at 1 msec, position 24 at 2 msec, etc.
The programmed commands to specify the above example are:
#A
CMX Specifies X axis for contour mode
CD 48=2 Specifies first position increment and time interval, 2
2
ms
CD 240=3 Specifies second position increment and time interval, 2
3
ms
CD 48=4 Specifies the third position increment and time interval, 2
4
ms
CD 0=0 End Contour buffer
#Wait;JP#Wait,_CM<>511 Wait until path is done
EN
DMC-40x0 User Manual Chapter 6 Programming Motion • 110
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