CD Append VI
- Updated2023-03-14
- 9 minute(s) read
CD Append VI
Owning Palette: Model Interconnection VIs
Requires: Control Design and Simulation Module
Appends one linear model to another. The inputs and outputs of the Appended Model are the collective inputs and outputs of Model 1 and Model 2. The system models either must be continuous-time models or must have the same sampling time if they are discrete-time models. Wire data to the Model 1 and Model 2 inputs to determine the polymorphic instance to use or manually select the instance.
CD Append State-Space and State-Space

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Model 1 specifies the first model this VI uses to create the Appended Model. |
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Model 2 specifies the second model this VI uses to create the Appended Model. |
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error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
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Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. To access and modify the data in the model, use the Model Information VIs. |
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error out contains error information. This output provides standard error out functionality. |
CD Append (State-Space and Transfer Function)

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Model 1 specifies the first model this VI uses to create the Appended Model. |
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Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. To access and modify the data in the model, use the Model Information VIs. |
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error out contains error information. This output provides standard error out functionality. |
CD Append (State-Space and Zero-Pole-Gain)

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Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append (Transfer Function and State-Space)

![]() |
Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append Transfer Function and Transfer Function

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Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append Transfer Function and Zero-Pole-Gain

![]() |
Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. To access and modify the data in the model, use the Model Information VIs. |
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error out contains error information. This output provides standard error out functionality. |
CD Append Zero-Pole-Gain and State-Space

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Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append Zero-Pole-Gain and Transfer Function

![]() |
Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append Zero-Pole-Gain and Zero-Pole-Gain

![]() |
Model 1 specifies the first model this VI uses to create the Appended Model. |
![]() |
Model 2 specifies the second model this VI uses to create the Appended Model. |
![]() |
error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() |
Appended Model is the augmented model this VI produces from the two input models. When the two input models are not of the same model type, the following model hierarchy determines the model type of the resulting model: state-space>transfer function>zero-pole-gain. For example, if one input is a state-space model and the other is a zero-pole-gain model, the resulting model is a state-space model. 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 Append Details
This VI might convert one or both input models to different forms before connecting the models. Refer to the LabVIEW Control Design User Manual for more information about appending models.
This VI supports delays. This VI transfers the delay information from the input models to the augmented model. Refer to the LabVIEW Control Design User Manual for more information about delays.



