National Instruments Xmath Interactive Control Design Module ICDM - Manual (Page 19)

Chapter 2 Introduction to SISO Design
Xmath Interactive Control Design Module 2-4 ni.com
These are briefly described in the following sections, and in more detail in
later chapters. Several of these windows have different forms for SISO and
MIMO design. This chapter restricts the discussion to the SISO forms.
Refer to Chapter 11,
Introduction to MIMO Design , for a discussion of the
MIMO forms.
ICDM Main Window
The most important window is the ICDM Main window, which is used to:
• Communicate with Xmath (for example, transfer plants/controllers
from/to Xmath).
• Display warning and log messages.
• Display a variety of standard plots.
• Select a synthesis method for controller design.
• Control several auxiliary windows.
PID Synthesis Window
The PID Synthesis window is used to synthesize a PID controller, with up
to two additional poles (usually used for high frequency rolloff). Each term
can be separately toggled on and off, so the PID
window can be used to
synthesize P, PD, PI, PID, lead-lag, and lag-lead controllers. The design
parameters can be typed in, manipulated graphically by slider controls, or
manipulated graphically on a Bode plot of the controller transfer function.
Root Locus Synthesis Window
The Root Locus window can be used in many ways for synthesis and
analysis of controllers. It can display a conventional root locus in near
real-time, while the user drags controller poles and zeros. The user can
graphically create or destroy controller poles and zeros. The closed-loop
poles can be dragged along the root locus plot, which causes the gain
parameter to be set automatically. Nonconventional phase and gain
contours can be plotted as an aid to controller synthesis or robustness
analysis.
Pole Place Synthesis Window
The Pole Place Synthesis window is used to design a controller by
assigning the closed-loop poles. The closed-loop poles can be typed in, or
dragged on a plot. The closed-loop poles can be scaled in frequency or time
by graphical input, or assigned to a Butterworth configuration. The pole
place window supports integral action as an option.