Owning Palette: State-Space Model Analysis VIs
Installed With: Control Design and Simulation Module
Calculates the controllability or observability Grammian of the State-Space Model for a stable system. The system can be continuous or discrete. You can use this VI to balance state-space models and to study controllability and observability properties of the system.
 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 calculates Grammian. | ||||||
 | Tolerance is the threshold this VI uses to determine if the system is controllable and stable. The default is 1E–6. | ||||||
 | Type specifies if this VI calculates the controllability or observability Grammian.
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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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 | Grammian returns the controllability or observability Grammian matrix. | ||||||
 | 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 Grammians 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.