Download Help (Windows Only) 
Creates a transfer function representation of a system using the Sampling Time (s), Numerator, Denominator, and Delay. This VI also produces a transfer function model which specifies the data in symbolic form. You can use this polymorphic VI to create a singleinput singleoutput (SISO), SISO Symbolic, multipleinput multipleoutput (MIMO), or MIMO Symbolic transfer function model. You must manually select the polymorphic instance to use.
Use the pulldown menu to select an instance of this VI.
Sampling Time (s) defines whether the model represents a continuoustime system or a discretetime system. If the model represents a continuoustime system, Sampling Time (s) must equal zero. If the model represents a discretetime system, Sampling Time (s) must be greater than zero and equal to the sampling rate, in seconds, of the discrete system. The default is 0.


Numerator contains the constant coefficients, in ascending order, of a polynomial that represents the numerator of a SISO transfer function. The coefficients take the following form: b_{0} + b_{1}s + ... +b_{m}s^{m}.  
Denominator contains the constant coefficients, in ascending order, of a polynomial that represents the denominator of a SISO transfer function. The coefficients take the following form: a_{0} + a_{1}s + ... +a_{n}s^{n}.  
Delay is the transport time delay that might exist in the system. Refer to the LabVIEW Control Design Toolkit User Manual for more information about delays.  
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.
 
Transfer Function Model is the system model this VI creates. When the sampling time is zero (for continuoustime), the Numerator and Denominator collectively represent the mathematical model (in Laplace transformation) of a dynamic system H(s) that provides the relationship between the input U(s) and output Y(s) of the system. 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.
Rightclick the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

Sampling Time (s) defines whether the model represents a continuoustime system or a discretetime system. If the model represents a continuoustime system, Sampling Time (s) must equal zero. If the model represents a discretetime system, Sampling Time (s) must be greater than zero and equal to the sampling rate, in seconds, of the discrete system. The default is 0.


Symbolic Numerator is the symbolic representation of the constant coefficients of a polynomial that represent the numerator of a SISO transfer function. The i^{th} element of Symbolic Numerator is the coefficient of the i^{th} order term of the polynomial. The index is zerobased.  
Symbolic Denominator is the symbolic representation of the constant coefficients of a polynomial that represent the denominator of a SISO transfer function. The i^{th} element of Symbolic Denominator is the coefficient of the i^{th} order term of the polynomial. The index is zerobased.  
Symbolic Delay is the symbolic representation of the transport time delay that may exist in the system. Refer to the LabVIEW Control Design Toolkit User Manual for more information about delays.  
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.
 
Variables contains the name and value of each variable.
 
Transfer Function Model is the numeric model that this VI evaluates using data from Variables. This VI converts empty array elements into numeric zeros. 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.
Rightclick the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

Sampling Time (s) defines whether the model represents a continuoustime system or a discretetime system. If the model represents a continuoustime system, Sampling Time (s) must equal zero. If the model represents a discretetime system, Sampling Time (s) must be greater than zero and equal to the sampling rate, in seconds, of the discrete system. The default is 0.


Transfer Function(s) is an array of transfer function models that you can use to define the dynamics of a multipleinput singleoutput (MISO), a singleinput multipleoutput (SIMO), or a multipleinput multipleoutput (MIMO) system.
 
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.
 
Transfer Function Model is the system model this VI creates. The size of the Transfer Function(s) array determines if the system is SISO, MIMO, MISO, or SIMO. 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.
Rightclick the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

Sampling Time (s) defines whether the model represents a continuoustime system or a discretetime system. If the model represents a continuoustime system, Sampling Time (s) must equal zero. If the model represents a discretetime system, Sampling Time (s) must be greater than zero and equal to the sampling rate, in seconds, of the discrete system. The default is 0.


Symbolic Transfer Function(s) is the symbolic representation of the transfer functions that you can use to define the dynamics of a singleinput singleoutput (SISO), multipleinput singleoutput (MISO), singleinput multipleoutput (SIMO), or multipleinput multipleoutput (MIMO) system.
 
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.
 
Variables contains the name and value of each variable.
 
Transfer Function Model is the system model this VI creates. The size of the Transfer Function(s) array determines if the system is SISO, MIMO, MISO, or SIMO. 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.
Rightclick the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

Only the SISO and SISO Symbolic instances of this VI support delays. To represent a delay in the model, you must specify the delay in this VI. Refer to the LabVIEW Control Design Toolkit User Manual for more information about delays.