Why Bus Selector unable to identify input signals ?

I am connecting a Model predictive controller unit to a TITO system. It is controlled by closed loop. When running the simulation, error message below was pop up.

The signal connected to the input port of 'MultvariableTank3aTestOnly/Bus Selector1' is not a bus signal. The input to the Bus Selector block must be a virtual or nonvirtual bus signal. A possible cause of this error is the use of a bus-capable block (such as Merge or Unit Delay) that in this current situation is unable to propagate the bus downstream to the block reported in this error. Please see Simulink documentation for further information on composite (i.e. bus) signals and their proper usage.

Component:Model Predictive Controller | Category:Find Operating Point error

Could somebody advice me how to solve it? Really appreciate it.

Anthony

[RenatoL]

Have you checked if the signal in question comes from a Bus Creator?

From my experience, if it's not (for example, if it has multiple elements but formed using a Mux) then that kind of error will be shown.

[Rhea Chandy]

To add to what RenatoL said above,are you using a Mux block or a Merge block to combine inputs? It may be helpful if you share your model so that I can see where is the issue has come up.

[ing ming chew]

Dear Rhea Chandy and Renatol;

The error was started from the output of MPC block where i have checked and try on any possible settings. i do not have idea of this error when i adapted my model with the example avaliable online as below:

https://ch.mathworks.com/help/mpc/gs/control-of-a-multi-input-multi-output-nonlinear-plant.html

I am here to share my file for you further advice (if possible).

Thank you so much of your advice.

Best regards

Anthony

Answer 1

[Rhea Chandy]

Hi, it seems like you are getting this error because you're using a bus selector block for the output of the MPC block.

Consider using Demux block to extract the components of the input MPC signal and output separate signals. Also use Mux blocks to combine the input signals. Further, In the example you've showed, it is mux and demux blocks that are used.

[ing ming chew]

Hi,

Thank you so much of your advice on it. I am so happy because my problem is resolved. Have a great day.

Best regards

Anthony