SI Convert to Models of CDT VI

System Identification VIs

previous page next page
SI Convert to Models of CDT VI

Owning Palette: Model Conversion VIs

Installed With: System Identification Toolkit

Converts a model you created in the LabVIEW System Identification Toolkit into a transfer function, zero-pole-gain, or state-space model that you can use with the LabVIEW Control Design and Simulation Module. You must manually select the polymorphic instance to use.

Example

Use the pull-down menu to select an instance of this VI.

 Place on the block diagram  Find on the Functions palette

SI Convert to Models of CDT (MIMO SS)

realization type specifies the type of state-space realization to use.

0minimum (Default)—Specifies that this VI uses a state-space realization after removing zero-pole cancellations and all states that do not affect the output of the system.
1full—Specifies that this VI uses a state-space realization without reducing any states.
system model contains information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
measured only? specifies whether to apply the noise stimulus of the model system to the linear, time-invariant (LTI) system of the Control Design and Simulation Module. By default, the state-space model that the Control Design and Simulation Module uses does not include the disturbance e(t) of the system. However, the models estimated by the System Identification Toolkit include e(t). If measured only? is TRUE, this VI ignores e(t) in the conversion. If measured only? is FALSE, this VI treats e(t) as an input of the system.
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 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.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
tolerance determines zero-pole cancellations. If the difference between the location of a pole and a zero is within the tolerance, this VI removes the zero-pole pair.
state-space model returns the state-space representation of the system model.
Model name returns the name of the model.
Sampling Time returns the time period in seconds between two consecutive samples of the signals in the system. Sampling Time is the reciprocal of the sampling rate in hertz.
A returns the system matrix that describes the dynamics of the states of the system.
B returns the input matrix that relates the inputs to the states.
C returns the output matrix that relates the outputs to the states.
D returns the transmission matrix that relates the inputs to the outputs.
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.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

SI Convert to Models of CDT (MIMO TF)

realization type specifies the type of state-space realization to use.

0minimum (Default)—Specifies that this VI uses a state-space realization after removing zero-pole cancellations and all states that do not affect the output of the system.
1full—Specifies that this VI uses a state-space realization without reducing any states.
system model contains information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
measured only? specifies whether to compute the transfer function between the noise and outputs of the system. If measured only? is TRUE, this VI computes only the transfer function between the stimulus signals and response signals. If measured only? is FALSE, this VI computes the transfer function between the stimulus signals and the response signals as well as the transfer function between the noise and the response signals.
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 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.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
tolerance determines zero-pole cancellations. If the difference between the location of a pole and a zero is within the tolerance, this VI removes the zero-pole pair.
transfer function model returns the transfer function representation of the system model.
Model name returns the name of the model.
Sampling Time returns the time period in seconds between two consecutive samples of the signals in the system. Sampling Time is the reciprocal of the sampling rate in hertz.
transfer function(s) returns the transfer function(s) of the system model.
numerator returns the numerator of the transfer function.
denominator returns the denominator of the transfer function.
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.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

SI Convert to Models of CDT (MIMO ZPK)

realization type specifies the type of state-space realization to use.

0minimum (Default)—Specifies that this VI uses a state-space realization after removing zero-pole cancellations and all states that do not affect the output of the system.
1full—Specifies that this VI uses a state-space realization without reducing any states.
system model contains information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model contains.
Note  You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe.
measured only? specifies how the VI treats the disturbance term of the input system model. If measured only? is TRUE, this VI ignores the disturbance term and converts the transfer function between the stimulus and the response. If measured only? is FALSE, this VI treats the disturbance term as part of the input and converts the transfer function between the noise and the response.
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 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.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
tolerance determines zero-pole cancellations. If the difference between the location of a pole and a zero is within the tolerance, this VI removes the zero-pole pair.
zero-pole-gain model returns the zero-pole-gain representation(s) of the system model.
Model name returns the name of the model.
Sampling Time returns the time period in seconds between two consecutive samples of the signals in the system. Sampling Time is the reciprocal of the sampling rate in hertz.
zero-pole-gain(s) returns the zero-pole-gain of the system model.
k returns the gain values of the zero-pole-gain model.
z returns the zeros of the zero-pole-gain model.
p returns the poles of the zero-pole-gain 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.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

Example

Refer to the Model Conversion VI in the labview\examples\System Identification\Getting Started\General.llb for an example of using the SI Convert to Models of CDT VI.

 Open example  Browse related examples

previous page start next page