Using merge block with bus signal inputs.

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Benjamin Wang 2012-11-16

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Hi, guys

I am really confused with the 'If/else -> Action -> Merge' pattern in Simulink, especially when working with Bus Signals.

Say, I created a bus with two members, 'a' and 'b', both are scalars with initial value of 0. I want to repeatedly increase 'a' by 1 when it is less than 5, and otherwise do nothing.

I know I could have merged the member 'a' rather than the whole bus signal. It's just an over-simplified version of my real work, which does lots of stuff in the 'If Action Subsystem'.

I was gonna upload a .mdl file to demonstrate my question more clear. Then I found that there is no way to do that here. So, for short, my question is: how to merge bus signals?

Thanks!

Ben

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Answer 1

Kaustubha Govind 2012-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/53877-using-merge-block-with-bus-signal-inputs#answer_65544

The Merge block does support bus signals. Look for the section called Bus Support in the documentation.

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Benjamin Wang 2012-11-19

Thank you Kaustubha. Sorry, I'm late.

I knew that the Merge block supports bus signals. But I couldn't make it work in a straight forward way. Then I found out that I had to put a 'Signal Conversion' block in each 'If Action Subsystem', with its 'Output' parameter setting to 'Bus Copy'. Now my model works fine.