Owning Palette: State-Space Model Analysis VIs
Installed With: Control Design and Simulation Module
Calculates the observable staircase similarity transformation of a State-Space Model. You can use the staircase representation to identify observable and unobservable states by simple inspection of the A and C matrices of the transformed model.
 Place on the block diagram | Find on the Functions palette |
 | State-Space Model contains a mathematical representation of and information about the system for which this VI determines staircase transformation. | ||||||
 | Tolerance determines the threshold value below which this VI considers a diagonal entry in the system matrix A of the State-Space Model zero. The default is 0.0001. | ||||||
 | Observable Block Location determines if the observable block is in the upper left or bottom right corner of the transformed matrix.
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 | 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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 | Transformed Model returns the transformed system model in staircase form. | ||||||
 | Transformation Matrix (T) returns the matrix use for the similarity transformation. | ||||||
 | Observable States returns the number of observable states this VI finds per iteration of the calculation that the VI performs to get T. The sum of elements in this array is the total number of observable states. | ||||||
 | 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 Observability Staircase Details
This VI does not support delays unless the delays are part of the mathematical model that represents the dynamic system. To account for the delays in the synthesis of the controller, you must incorporate the delays into the mathematical model of the dynamic system using the CD Convert Delay with Pade Approximation VI (continuous models) or the CD Convert Delay to Poles at Origin VI (discrete models). Refer to the LabVIEW Control Design User Manual for more information about delays and the limitations of Pade Approximation.