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Chapter 5
Root Locus Synthesis
Plotting Styles
Xmath Interactive Control Design Module
Selecting View»Locus Select or pressing <Ctrl-L> in the Root Locus
window produces a dialog box in which the user can choose one of many
possible plotting styles. In all cases, the (open-loop) controller and plant
poles and zeros are shown on the plot. On color displays:
•
Controller poles and zeros are black
•
Plant poles and zeros are red
This serves as a mnemonic: you can manipulate black but not red poles or
zeros. On monochrome displays, the plant poles and zeros are lighter than
the controller poles and zeros. You can always use data-viewing to obtain
more information about a pole or zero. Refer to the
section of Chapter 2,
dialog box for choosing plotting style with standard (default) contours
selected.
Figure 5-2. Root Locus Select Dialog for Choosing Plotting Style
Introduction to SISO
Design. Figure 5-2 shows a
5-4
Data-Viewing Plots
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