CD Step Forward MPC Window VI

Control Design VI and Function

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Owning Palette: Predictive Control VIs

Installed With: Control Design and Simulation Module

Calculates the appropriate portion, or window, of the setpoint and/or disturbance profiles. You wire these windows to the appropriate input(s) of the CD Implement MPC Controller VI.

The CD Step Forward MPC Window VI also moves the control and prediction horizons forward.

Note Refer to Chapter 18, Creating and Implementing a Model Predictive Controller, of the LabVIEW Control Design User Manual for information about using this VI.

Place on the block diagram

Find on the Functions palette

Timestep Index specifies the sample time k at which this VI provides the correct window for the setpoint and/or disturbance profiles.

Initialize? is TRUE if you want to restart the calculation from any initial values you provide. Initialize is FALSE if you do not want to restart this calculation. The default value is FALSE.

MPC Controller In specifies the predictive controller model this VI uses. You create this model by using the CD Create MPC Controller VI.

Interleaved Output Setpoint specifies the interleaved values of the output setpoint profile.

Interleaved Disturbance Profile specifies the interleaved values of the disturbance profile.

Interleaved Control Action Setpoint specifies the interleaved values of the control action profile.

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.

MPC Controller Out returns the predictive controller model.

Output Reference Window returns an interleaved window of output setpoints for the current prediction horizon.

Disturbance Window returns an interleaved window of disturbance values for the current prediction horizon.

Control Action Reference Window returns an interleaved window of control action setpoints for the current prediction horizon.

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.

Profile Current Values returns the current values of the inputs, outputs, disturbances, states, and rates of change of control action profile.

	Control Action (u) returns the current values of the control actions.
	Output (y) returns the current values of the plant outputs.
	Disturbance (d) returns the current values of the disturbance.
	State (x) returns the current values of the plant states.
	Control Action Change (Du) returns the current rates at which the control actions are changing.

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