CD Construct State-Space Model VI

Owning Palette: Model Construction VIs

Requires: Control Design and Simulation Module

Creates a deterministic state-space representation of a system using the matrices A, B, C, and D, and the Sampling Time (s). You must manually select the polymorphic instance to use.

This VI constructs a deterministic state-space model. You can use the CD Construct Stochastic Model VI to construct a stochastic state-space model.

Details  

CD Construct State-Space Model (Numeric)

	Sampling Time (s) defines whether the model represents a continuous-time system or a discrete-time system. If the model represents a continuous-time system, Sampling Time (s) must equal 0. If the model represents a discrete-time system, Sampling Time (s) must be greater than 0 and equal to the sampling rate, in seconds, of the discrete system. A value of -1 specifies that Sampling Time (s) is irrelevant. The default is 0. Note  If you use the inputs to create a continuous-time system, setting the Sampling Time (s) to a value greater than 0 does not yield the discrete-time equivalent of the system. You must use the CD Convert Continuous to Discrete VI to convert the continuous-time system to the discrete-time equivalent of the system.
	A specifies the system matrix that describes the dynamics of the states of the system.
	B specifies the input matrix that relates the inputs to the states.
	C specifies the output matrix that relates the outputs to the states.
	D specifies the transmission matrix that relates the inputs to the outputs.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	State-Space Model returns the created numeric model. The data consists of the arrays A, B, C, and D. To access and modify the data in the model, use the Model Information VIs.
	error out contains error information. This output provides standard error out functionality.

CD Construct State-Space Model (Symbolic)

	Sampling Time (s) defines whether the model represents a continuous-time system or a discrete-time system. If the model represents a continuous-time system, Sampling Time (s) must equal 0. If the model represents a discrete-time system, Sampling Time (s) must be greater than 0 and equal to the sampling rate, in seconds, of the discrete system. A value of -1 specifies that Sampling Time (s) is irrelevant. The default is 0. Note  If you use the inputs to create a continuous-time system, setting the Sampling Time (s) to a value greater than 0 does not yield the discrete-time equivalent of the system. You must use the CD Convert Continuous to Discrete VI to convert the continuous-time system to the discrete-time equivalent of the system.
	Symbolic A is the symbolic representation of the system matrix that describes the dynamics of the states of the system.
	Symbolic B is the symbolic representation of the input matrix of the system that relates the inputs to the states.
	Symbolic C is the symbolic representation of the output matrix that relates the outputs to the states.
	Symbolic D is the symbolic representation of the transmission matrix that relates the inputs to the outputs.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	Variables contains the name and value of each variable. Name is a variable name this VI uses to define the data of the system model. Variable names can be a combination of letters and numbers. A variable name that begins with a capital letter E can produce unpredictable errors if parts of the original string represent numbers like 1E–2. Avoid terms beginning with E in such cases. Value is the numeric value this VI associates with the variable. The VI uses this value to evaluate the model.
	State Space Model returns the created model. The data consists of the arrays Symbolic A, Symbolic B, Symbolic C, and Symbolic D in which this VI evaluates string elements using data of the Variables array. To access and modify the data in the model, use the Model Information VIs.
	error out contains error information. This output provides standard error out functionality.

CD Construct State-Space Model Details

This VI supports specific combinations of the system matrices A, B, C, and D. Refer to the Required Matrices input of the CD Verify MIMO Properties VI for a complete list of the combinations.

This VI does not support delays directly. To add a delay to the model, use the CD Set Delays to Model VI. Refer to the LabVIEW Control Design User Manual for more information about delays.