How to connect bus signal with different data size using multiport switch?

Question

And Meng 2020-12-29

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评论： And Meng 2021-1-4

Hi,

I have two subsystems, and I want to minimized the data size for the signal that is been transfered in between the subsystems. The following figure shows the ideal case. When Constant1 = 1, the first signal with size {1} is transmitted; when Constant1 = 2, the second signal with size {2} is transmitted; Unfortunately, there will be error pop-up regarding to data size mistmatching in this model, which is attached. How could I solve this error or is there other approach to minized this data size. Noted that the constant value should be constant during the simulation.

Regards,

Andy

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Answer 1

Mark McBroom 2021-1-4

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I made a number of changes to your model, most importably was to remove mux blocks. Mux blocks should not be used. Use Vector/Matrix concat blocks to create vectors/matrices, use Bus Creater blocks to create buses.

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And Meng 2021-1-4

The Vector concat approach works great. In case of the bus creater, I wasn't able to use bus selector on the signal receving end, but I found this: https://www.mathworks.com/matlabcentral/answers/93227-is-it-possible-to-use-a-multiport-switch-to-select-between-several-buses-in-simulink-6-1-r14sp1. Both approachs work good to me. Thank you Mark.

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Answer 2

Mark McBroom 2021-1-1

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https://ww2.mathworks.cn/matlabcentral/answers/704963-how-to-connect-bus-signal-with-different-data-size-using-multiport-switch#answer_588588

On the Multi-port switch block, on the Signal Attirbutes tab, check the box "Allow different data input sizes".

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And Meng 2021-1-4

multi_switch_bus.slx

Thank you for your reply, but if using this approach the bus selector cannot accurately capture the virtual bus signal. Would there be other approach to deal with this data size? I have also attached the model for your reference.

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