SI Pole-Zero Plot VI

Owning Palette: Model Analysis VIs

Requires: Advanced Signal Processing Toolkit or Control Design and Simulation Module

Produces the pole-zero plot of a system model on an XY graph.

This VI computes the zeros and poles of the transfer function for one input-output pair of a system model. Use the SI Pole-Zero Plot Indicator to display the pole-zero plot on the front panel window.

Examples

	system model contains information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model contains. Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
	channel selects the signal pair with which to compute the transfer function. type specifies whether to compute the transfer function between a stimulus signal and a response signal or the transfer function between a noise signal and a response signal. 0 stimulus (default)—Computes the transfer function between a stimulus signal and a response signal. Use input index and output index to select the stimulus and response signals to use. 1 noise—Computes the transfer function between a noise signal and a response signal. Use input index and output index to select the noise and response signals to use. input index specifies the index of the system input channel with which to compute the transfer function. input index applies only for MISO or MIMO system models. output index specifies the index of the system output channel with which to compute the transfer function. output index applies only for MIMO system models.
	confidence level (%) specifies the percentage confidence interval for the poles and zeros.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	show confidence range? specifies whether to show the confidence range of the plot data. The default is TRUE.
	pole-zero plot returns the pole-zero plot of the input signal. pole-zero plot is a plot of the poles and zeros of the system model on the complex plane, where the real values are on the x-axis, and imaginary values are on the y-axis. Use the SI Pole-Zero Plot Indicator to display the pole-zero plot. real returns the real part of zeros and poles. imaginary returns the imaginary part of zeros and poles.
	error out contains error information. This output provides standard error out functionality.

Examples

Refer to the following VIs for examples of using the SI Pole-Zero Plot VI:

• Model Presentation VI: labview\examples\System Identification\Getting Started\General.llb
• Flexible Arm VI: labview\examples\System Identification\Industry Applications\Mechanical Systems.llb