CD Construct Lead-Lag Controller VI
Owning Palette: Model Construction VIs
Installed With: Control Design and Simulation Module
Constructs a phase-lead or a phase-lag controller model in transfer function form. You must manually select the polymorphic instance to use.
Use the pull-down menu to select an instance of this VI.
 Place on the block diagram | Find on the Functions palette |
CD Construct Phase-Lag Controller
 | Unit Gain Normalization specifies the type of lead or lag controller model you want to construct.
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 | Gain (K) specifies the gain of the controller model equation. | ||||||
| Parameter (tau) specifies the tau parameter of the controller model equation. | ||||||
| Beta specifies the beta parameter of the phase-lag controller model equation. The value of this parameter must be greater than 1. If you enter a value less than 1, LabVIEW coerces the value to be 1. | ||||||
 | 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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 | Transfer Function Model returns the mathematical representation of the phase-lag or phase-lead controller. | ||||||
 | wn returns the frequency, in rad/s, at which the Max Phase of the Transfer Function Model occurs. | ||||||
| Max Phase returns the maximum phase, in degrees, of the Transfer Function Model. | ||||||
 | 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 Phase-Lead Controller
| Unit Gain Normalization specifies the type of lead or lag controller model you want to construct.
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| Gain (K) specifies the gain of the controller model equation. | ||||||
| Parameter (tau) specifies the tau parameter of the controller model equation. | ||||||
| Alpha specifies the alpha parameter of the phase-lead controller model. | ||||||
| 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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| Transfer Function Model returns the mathematical representation of the phase-lag or phase-lead controller. | ||||||
| wn returns the frequency, in rad/s, at which the Max Phase of the Transfer Function Model occurs. | ||||||
| Max Phase returns the maximum phase, in degrees, of the Transfer Function Model. | ||||||
| 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 Lead-Lag Controller Details
This VI uses the following equations to calculate the outputs:
| Phase-Lag Controller | Phase-Lead Controller | |
| Transfer Function Model, if Unit Gain Normalization is Below 0dB |  |  |
| Transfer Function Model, if Unit Gain Normalization is Above 0dB |  |  |
| wn |  |  |
| Max Phase |  |  |