How to send continuous data from simulink block

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Rahul kumar 2012-8-17

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Hello,

I have to develop a model in Simulink which can send data continuously, the sent data should be stored in a block and if it reaches some predetermined value. It should trigger the next block.

I increase the value of a constant block by this code..!

for a=1:0.1:10
set_param('MyModelName/Constant','Value',num2str(a)) %send a to the model
pause(1) %pause for 1 second
end

but it is not sending the data continuously, everytime i have to press Run button.

let me know ur idea

Thanks in advance

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Rahul kumar 2012-8-20

编辑：Rahul kumar 2012-8-20

yes it is a signal coming out of that conditional block, not data

Rahul kumar 2012-8-20

Is my question clear?

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回答（3 个）

Ryan G 2012-8-17

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I don't think this code does what you think it does. There is no real-time operations between MATLAB and Simulink, so when you pause for 1 second it could take 1.5 seconds to process the next point in the sim or it could take 100 seconds in the sim depending on how fast it moves.

Try pre-packaging the data with a Time and Data vector and utilizing a To Workspace block or an Inport. For continuity you want to enable interpolation.

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Kaustubha Govind 2012-8-17

I think Ryan meant to say "From Workspace" instead of "To Workspace" block. :)

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Albert Yam 2012-8-17

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Why do you need the 'pause'? If you want an input to 'change over time', use a look-up table, or signal generator.

hm..deja vu

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Albert Yam 2012-8-21

在 MATLAB Online 中打开

You still have yet to explain why you need to store the value, and you just reiterated your wording, almost verbatim, so no, not more clear.

clock ->  Look-up(n-D) -> Compare to Constant ---> Scope(2)
                       --------------------------> Scope(1)

Where

Look-up(n-D)
table dimensions = 1
First input (row) = 0:length(a)-1
Table data = a    %where in workspace:  >> a = 0:0.1:10;

Compare to Constant

Operator = >
Constant value = 5

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Rajan 2012-8-20

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I don't think you can change a value used in constant block ,as the name of the block suggests ,it is a constant value through out the execution.

Don't sent the data from a constant block , instead make a simple addition which increments by 0.2 every time with in the model(not from the code) and send the output of sum block to your data store block . Or compare the output of sum block with comparator block (==6).

I hope this serves your cause.