CD Create MPC FIFO VI
Owning Palette: Predictive Control VIs
Installed With: Control Design and Simulation Module
Creates a queue or real-time (RT) FIFO for an MPC controller. You use this queue or RT FIFO to update setpoint and/or disturbance profiles dynamically.
You can create up to three types of queues/RT FIFOs: one each for the output setpoint, control action setpoint, and disturbance profiles.
 | 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 |
 | MPC Controller In specifies the predictive controller model this VI uses. You create this model by using the CD Create MPC Controller VI. | ||||||
 | Signal Type specifies whether the MPC FIFO contains values of an output setpoint profile, control action setpoint profile, or disturbance profile.
You can choose from the following options:
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 | MPC FIFO Size In specifies the maximum number of elements in the MPC FIFO. The type of elements depends on the value you specify for the Signal Type parameter. The default value of MPC FIFO Size In is –1, which specifies no limit. | ||||||
 | 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.
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 | MPC FIFO Name specifies an optional name for the MPC FIFO. | ||||||
 | MPC Controller Out returns the predictive controller model. | ||||||
| MPC FIFO returns the queue or FIFO this VI creates. | ||||||
 | MPC FIFO Size Out returns the maximum number of elements in 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.
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