SI Convert Continuous to Discrete Model VI

System Identification VIs

Owning Palette: Model Conversion VIs

Installed With: System Identification Toolkit

Converts a continuous model to a discrete model using the sampling rate you specify. You can use this VI to convert continuous transfer function, state-space, and zero-pole-gain models to discrete transfer function, state-space, and zero-pole-gain models, respectively.

Details

Place on the block diagram

Find on the Functions palette

system model in 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 in 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.

error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

sampling rate is the sampling frequency, in hertz, of the corresponding discrete model to which this VI converts the continuous model.

tolerance determines zero-pole cancellations. If the difference between the location of a pole and a zero is within the tolerance, this VI removes the zero-pole pair.

system model out returns 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 out contains.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

SI Convert Continuous to Discrete Model Details

This VI accepts only continuous transfer function, state-space, and zero-pole-gain models and converts these continuous models to their discrete equivalents. For ARX, ARMAX, output-error, Box-Jenkins, and general-linear models, use the SI Model Conversion VI to convert these models to transfer function, state-space, or zero-pole-gain models.

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