CD Construct Special TF Model VI
Owning Palette: Model Construction VIs
Installed With: Control Design and Simulation Module
Creates commonly used transfer function models. You must manually select the polymorphic instance to use.
The first order instance generates a transfer function with the following equation:
where K is the gain and t is the time constant.
Use the pull-down menu to select an instance of this VI.
 Place on the block diagram | Find on the Functions palette |
CD Construct Special TF Model (1st Order)
 | Static Gain specifies the DC gain of the system, which is the gain when the frequency is 0. The default value is 1. | ||||||
| Time Constant (s) specifies the system time constant, or the time required for the output to reach 63% of its final response. The default is 0. | ||||||
 | 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 exception control to treat what is normally an error as no error or to treat a warning as an error.
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.
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| Delay is the delay this VI uses to construct the special model. The default is NaN. Refer to the LabVIEW Control Design User Manual for more information about delays. | ||||||
 | Transfer Function Model returns the transfer function this VI constructs based on the inputs. 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.
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CD Construct Special TF Model (2nd Order)
The second order instance generates a transfer function with the following equation:
where wn is the natural frequency and z is the damping ratio.
| Static Gain specifies the DC gain of the system, which is the gain when the frequency is 0. The default value is 1. | ||||||
| Damping Ratio specifies the damping ratio, which reflects the damping level as a fraction of the critical damping value where the poles become real, of the second-order transfer function model. The default is zero. | ||||||
| Natural Frequency (rad/s) specifies the natural frequency, in radians/seconds, of the second-order transfer function model. The default is zero. | ||||||
| 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 exception control to treat what is normally an error as no error or to treat a warning as an error.
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.
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| Delay is the delay this VI uses to construct the special model. The default is NaN. Refer to the LabVIEW Control Design User Manual for more information about delays. | ||||||
| Transfer Function Model returns the transfer function this VI constructs based on the inputs. 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.
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CD Construct Special TF Model (Delay Pade Approximation)
Delay refers to a continuous time value in which the Pade polynomial approximates behavior.
| Transport Delay specifies the transport time delay that you want to use to create a transfer function using Pade approximation. The default is 0. | ||||||
 | Polynomial Order specifies the order of this polynomial approximation. The default is 3. | ||||||
| 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 exception control to treat what is normally an error as no error or to treat a warning as an error.
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.
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| Pade Approximation Model returns the transfer function model with delays this VI incorporates. 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.
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CD Construct Special TF Model Details
This VI supports delays. To represent a delay in the model, you must specify the delay in this VI. Refer to the LabVIEW Control Design User Manual for more information about delays.