12P2532X152 KJ3222X1-BA1 CE4003S2B1 module

The previous step showed the plot if the motion continued all the way to 5000, however partway through the motion, the object that was being tracked changed direction, so the host program determined that the actual target position should be 2000 cts at that time. Figure 2 shows what the position profile would look like if the move was allowed to complete to 2000 cts. The position was modified when the robot was at a position of 4200 cts. Note that the robot actually travels to a distance of almost 5000 cts before it turns around. This is a function of the deceleration rate set by the DC command. When a direction change is commanded, the controller decelerates at the rate specified by the DC command. The controller then ramps the velocity in up to the value set with SP in the opposite direction traveling to the new specified absolute position. In figure 3 the velocity profile is triangular because the controller doesn’t have sufficient time to reach the set speed of 50000 cts/sec before it is commanded to change direction.

In this motion

 the host program commands the controller to begin motion towards position 5000, changes the target to -2000, and then changes it again to 8000. Figure 4 shows the plot of position vs. time, Figure 5 plots velocity vs. time, and Figure 6 demonstrates the use of motion smoothing (IT) on the velocity profile in this mode. The jerk in the system is also affected by the values set for AC and DC.Note the controller treats the point where the velocity passes through zero as the end of one move, and the beginning of another move. IT is allowed, however it will introduce some time delay.

Trip Points

 Most trip points are valid for use while in the position tracking mode. There are a few exceptions to this; the AM and MC commands may not be used while in this mode. It is recommended that MF, MR, or AP be used, as they involve motion in a specified direction, or the passing of a specific absolute position

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