Plot time, 10 special status values available in plots, Target speed – Delta RMC101 User Manual
Page 98: Target speed -48, 9 plot time, 1 target speed
RMC100 and RMCWin User Manual
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3. Under Orientation, click either Portrait or Landscape.
4. Click OK in the Print Setup dialog box.
5. Click OK in the Plot Print Options dialog box.
To print a plot:
1. On the File menu, click Print.
2. Select the printer and number of copies to print.
3. Click OK.
3.5.9 Plot Time
The plot time field controls the time interval between plot samples. Because the number of
samples for a full graph is fixed, the total graph length is also set by this parameter. In a full
graph, there are 1024 samples. The plot time units are 1000/1024 milliseconds. Therefore, to
request the graphs on an axis to be 4 seconds in length, this parameter should be set to 4. This
will result in 1024 samples, each 4000/1024 milliseconds apart, for a total length of 4000
milliseconds.
The following two equations can be used for requesting a plot length:
Full Plot Length = PLOT TIME x 1 second
Plot Interval = PLOT TIME x 1000 ms
1024
3.5.10 Special Status Values Available In Plots
3.5.10.1 Target Speed
The target speed is displayed in a plot, both graphically and in the detail window, but it is not
displayed in the main status area. Like the Actual Speed, this parameter is calculated. However,
instead of being calculated off of Transducer Counts, it is calculated from the Target Position.
Therefore, when viewing a plot you can compare the Actual and Target Speeds to determine how
well the actual move is tracking the intended move.
Why is the Target Speed Jagged During Constant Velocity?
With older versions of the RMC100 CPU firmware and RMCWin, you may notice that during
some constant velocity moves, the Target Speed is not flat. The jaggedness is caused by
quantizing. That is, suppose that at constant velocity the axis is moving an average of 4.2 position
units per millisecond. Because the motion controller only reads whole numbers of position units,
the Target Position would appear to increase by 4 position units for four milliseconds, and every
fifth millisecond it would move 5 position units. Therefore, if we were to calculate the speed based
on a single interval, the speed would vary by 25% every fifth interval.