CD Unit Feedback VI

Control Design VI and Function

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CD Unit Feedback VI

Owning Palette: Model Interconnection VIs

Installed With: Control Design and Simulation Module

Connects Model 1 with Model 2 such that the Closed-Loop Model represents these models in a unit feedback configuration. You can specify which outputs this VI feeds back to which inputs of the system. The system models either must be continuous-time models or must have the same sampling time if they are discrete-time models. The data types you wire to the Model 1 and/or Model 2 inputs determine the polymorphic instance to use.

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 connecting models in a feedback configuration.

Details  

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

 Place on the block diagram  Find on the Functions palette

CD Unit Feedback (State-Space and State-Space)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (State-Space and Transfer Function)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (State-Space and Zero-Pole-Gain)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Transfer Function and State-Space)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Transfer Function and Transfer Function)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Transfer Function and Zero-Pole-Gain)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Zero-Pole-Gain and State-Space)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Zero-Pole-Gain and Transfer Function)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback (Zero-Pole-Gain and Zero-Pole-Gain)

Feedback Sign specifies the sign of all feedback connections. If Feedback Sign is positive (TRUE), all feedback connections are positive. If Feedback Sign is negative (FALSE), all feedback connections are negative. The default is negative (FALSE).

When you specify connections using Feedback Connections, this VI ignores Feedback Sign.
Model 1 specifies the first model this VI uses to create the Closed-Loop Model.
Model 2 specifies the second model this VI uses to create the Closed-Loop Model.
Series Connections specifies the outputs of Model 1 to connect to the inputs of Model 2.
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.
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.
Feedback Connections uses the index number of the output and input to define each output-input pair, from Model 2 and Model 1, in a feedback loop. This VI adds or subtracts the output value of Model 2 from a reference input and assigns a value to the input of Model 1. Signal determines if this VI adds or subtracts the output of Model 2 to the reference input. The indexes are zero-based. If you do not specify any Feedback Connections, this VI connects as many output-input pairs as possible from Model 2 to Model 1, and Feedback Sign specifies the sign of all feedback connections.
Model Output specifies the index number of the output of Model 2 to which you want to connect an input of Model 1.
Model 1 Input specifies the index number of the input of Model 1 to which you want to connect an output of Model 2. The indexes are zero-based.
Signal defines the feedback sign for the connection that Model Output and Model 1 Input specify. If you define output-input pairs using Feedback Connections, this VI uses Signal to define the feedback sign instead of Feedback Sign. The default value is negative.
Delay Adjustment Settings approximates the delay that this VI eliminated by connecting the models. With continuous systems, the approximation is based on Pade approximation, while discrete systems increase the system order to account for delay.

If you specify FALSE for the Adjust Model for Delay parameter, this VI does not make any approximation for any delay.
Adjust Model for Delay specifies if you want to adjust the model for delay. The default is FALSE, which means you do not want to adjust the model for delay.
Pade Approximation Order specifies the Pade approximation order. The default is 2.
Closed-Loop Model represents the closed-loop system that results from this VI connecting Model 1 and Model 2 according to the connections you specify. When the two input models are different model types, this VI determines the model type of the resulting model by the following model hierarchy: 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. 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.

CD Unit Feedback Details

This VI does not support delays for models in a closed-loop configuration. If a model has a delay, this VI ignores the delays and gives a warning. Refer to the LabVIEW Control Design User Manual for more information about delays.

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