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SI Convert to Models of CDT VI

LabVIEW 2013 System Identification Toolkit Help

Edition Date: June 2013

Part Number: 372458D-01

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Owning Palette: System Identification VIs

Requires: 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.

Details  Example

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

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 this VI regards the noise stimulus as an input of the resulting system model. If measured only? is TRUE, this VI ignores the disturbance e(t) in the conversion. If measured only? is FALSE, this VI treats e(t) as an input of the system model. The default is TRUE.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
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. You can visually inspect the location difference in the pole-zero plot. The default is 1E-12.
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. This output provides standard error out functionality.

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 this VI regards the noise stimulus as an input of the resulting system model. If measured only? is TRUE, this VI ignores the disturbance e(t) in the conversion. If measured only? is FALSE, this VI treats e(t) as an input of the system model. The default is TRUE.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
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. You can visually inspect the location difference in the pole-zero plot. The default is 1E-12.
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. This output provides standard error out functionality.

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 whether this VI regards the noise stimulus as an input of the resulting system model. If measured only? is TRUE, this VI ignores the disturbance e(t) in the conversion. If measured only? is FALSE, this VI treats e(t) as an input of the system model. The default is TRUE.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
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. You can visually inspect the location difference in the pole-zero plot. The default is 1E-12.
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.
Gain returns the gain values of the zero-pole-gain model.
Zeros returns the zeros of the zero-pole-gain model.
Poles returns the poles of the zero-pole-gain model.
error out contains error information. This output provides standard error out functionality.

SI Convert to Models of CDT Details

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). You can specify whether to ignore e(t) in the conversion by setting the value of measured only?.

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.


 

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