Data exchange between active Simulink model and Matlab script

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Kolja Wehber 2023-11-8

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编辑： Kolja Wehber 2023-12-5

Hello,

I need to establish a connection between a Simulink model and a GUI/Matlab script. Between those I want to transfer a big amount of data (arround 30.000 values so far).

This data is generated on an external system, which is communicating with the Simulink model via matrix transmitters and a TCP-IP connection. This connection already works. I have a problem with the exchange of data between Simulink and the GUI, because in order to work properly, the Simulink model has to run constantly. How can I transfer an array with all my calculated values to the GUI?

I already tried executing the Simulink model once from the script and transfer the data afterwards, but it takes way to long to connect with the matrix transmitter (like in the attached example).

The access over the runtime data of a block is also no solution, because I can only read one signal and not the whole value, right?

Is it possible to exchange this amount of data with a refresh rate around 1s or faster?

Attached is a simple example, instead of the TCP-IP connection it receives random values from the script and transfers them back (The TCP-IP block is commented out). The script just plots the random values in a plane.

I have to use MATLAB version R2017b.

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Answer 1

Shubham 2023-12-3

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在 MATLAB Online 中打开

Hey @Kolja Wehber,

I understand that you want to establish a connection between a Simulink model and a MATLAB script. You want to transfer a large amount of data at a high refresh rate.

For establishing a tcp/ip connections please have a look at the following examples. These examples explain how to setup model parameters and setup a connection for transferring data:

https://www.mathworks.com/help/instrument/send-and-receive-data-over-a-tcpip-network.html#brciyf3-1

https://www.mathworks.com/help/instrument/communicate-between-tcpip-client-receive-block-and-tcpip-server-in-matlab.html

I have tried the following at my end:

MATLAB script:

server = tcpserver('0.0.0.0',5000,ByteOrder="big-endian",ConnectionChangedFcn=@connectionFcn) 
sim("simul.slx"); 
ans =[]; 
function connectionFcn(src, ~) 
global ans; 
while src.Connected 
    x = read(src,1,"double"); 
    ans = [ans x]; 
    pause(0.01); % to control refresh rate 
    if size(ans,2)==200 
        data=ans; 
        break; 
    end 
end 
disp(ans); 
end 

Simulink model:

The above MATLAB script reads a single value as “double” data type. You can read multiple values at a time after checking available bytes. You can also store the data in a datastore memory block in Simulink to store the data and access it at regular intervals.

I hope this helps!!