You are here: NI Home > Support > Product Reference > Manuals > LabVIEW Control Design Toolkit 3.0 Help

Converts a discrete-time model to a continuous-time model. This VI converts the discrete-time model using the specified Method. You can use this polymorphic VI to convert continuous state-space, transfer function, and zero-pole-gain models to discrete models. The data type you wire to the Discrete State-Space Model input determines the polymorphic instance to use.

Details  

Use the pull-down menu to select an instance of this VI.

Select an instance CD Convert Discrete to Continuous (State-Space)CD Convert Discrete to Continuous (Transfer Function)CD Convert Discrete to Continuous (Zero-Pole-Gain)

CD Convert Discrete to Continuous (State-Space)

	Prewarp Frequency (rad/s) calculates the continuous-time model with the inverse algorithm of the Tustin (bilinear) transformation with prewarping.
	Discrete State-Space Model is the discrete-time system model that this VI converts into a continuous-time equivalent.
	Method is the algorithm this VI uses to calculate the continuous-time equivalent of the discrete-time system model. 0 Zero-Order-Hold (default) 1 Tustin (Bilinear)— 2 Prewarp—, where 3 Forward— 4 Backward— 5 Z-Transform
	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.
	Continuous State-Space Model is the continuous-time equivalent of the input discrete-time system model. To access and modify the data in the model, use the Model Information VIs.
	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.

CD Convert Discrete to Continuous (Transfer Function)

	Prewarp Frequency (rad/s) calculates the continuous-time model with the inverse algorithm of the Tustin (bilinear) transformation with prewarping.
	Discrete Transfer Function Model is the discrete-time system model that this VI converts into a continuous-time equivalent.
	Method is the algorithm this VI uses to calculate the continuous-time equivalent of the discrete-time system model. 0 Zero-Order-Hold (default) 1 Tustin (Bilinear)— 2 Prewarp—, where 3 Forward— 4 Backward— 5 Z-Transform
	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.
	Continuous Transfer Function Model is the continuous-time equivalent of the input discrete-time system model. To access and modify the data in the model, use the Model Information VIs.
	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.

CD Convert Discrete to Continuous (Zero-Pole-Gain)

	Prewarp Frequency (rad/s) calculates the continuous-time model with the inverse algorithm of the Tustin (bilinear) transformation with prewarping.
	Discrete Zero-Pole-Gain Model is the discrete-time system model that this VI converts into a continuous-time equivalent.
	Method is the algorithm this VI uses to calculate the continuous-time equivalent of the discrete-time system model. 0 Zero-Order-Hold (default) 1 Tustin (Bilinear)— 2 Prewarp—, where 3 Forward— 4 Backward— 5 Z-Transform
	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.
	Continuous Zero-Pole-Gain Model is the continuous-time equivalent of the input discrete-time system model. To access and modify the data in the model, use the Model Information VIs.
	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.

CD Convert Discrete to Continuous Details

This VI supports delays. This VI multiplies delays by the sampling time in the conversion process. Refer to the LabVIEW Control Design Toolkit User Manual for more information about delays.