CD Read MPC FIFO VI

Control Design VI and Function

CD Read MPC FIFO VI

Owning Palette: Predictive Control VIs

Installed With: Control Design and Simulation Module

Reads a portion, or window, of profile values from the MPC FIFO.

You wire the Profile Window output of this VI to either the Output Reference Window, Control Action Reference Window, or Disturbance Window input of the CD Implement MPC Controller VI. The correct input depends on the value of the Signal Type parameter.

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

Place on the block diagram

Find on the Functions palette

Initial Profile Window specifies the values this VI uses to initialize the MPC FIFO.

Initialize? is TRUE if you want to initialize the MPC FIFO by using the values of the Initial Profile Window parameter. Initialize is FALSE if you do not want to initialize the MPC FIFO. 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.

MPC FIFO specifies the MPC FIFO this VI uses. You create this MPC FIFO by using the CD Create MPC FIFO VI.

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.

Profile Window returns the requested profile window from the MPC FIFO.

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.

MPC FIFO Empty? returns TRUE if the MPC FIFO contains no elements. This indicator returns FALSE if the MPC FIFO contains at least one element.

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