Returning output signals from a Simulink block to Matlab

I have a Simulink Block with 9 output signals which can either be 0 or 1 (true or false). Each output signal is connected to an OutBus. I want to be able to get the values for each of the signals in Matlab so I can assign them to variables and use them elsewhere. I need to be able to do this while the simulation is running, which is where I am having trouble. Any help would be appreciated.

[Paul]

If you don't mind me asking, what are you going to do with the signal values output to Matlab while the simulation is running?

Do you need these signals coming out "continuously" or only at certain times or events in the simulation?

[Fangjun Jiang]

Usually, it is difficult to access Simulink signals when the simulation is running. That is why @Paul asks for further clarification. You could do that processing using a MATLAB Function block and add it to the Simulink model.

[Luke Chapman]

The matlab simulation is being run from Enterprise architect, the inputs to the system are set using constant blocks and the set_param function is used to set the constant values. I need to get the outputs of the system which are in the form of logical signals. I was looking to be able to run a piece of code which would capture the current value of the signals (0 or 1) and set them to a variable stored in the workspace. I can do this currently using to workspace blocks or by logging the signals but it only works when the simulation is paused or stopped (i.e the variable does not update while the simulation is running) this unfortunately is not good enough for what I need to do.

[Adil]

@Paul Hey Paul, i know its a bit late but if i wanted to control, say the upper and lower limits of hysterisis controller which can only be changed in its special window using a variable that can be changed only in model callbacks, how would i do it such that the limits depend on output of some block. are there programable blocks where we can put matlab codes and then change it to global scope?

just as an example,thought i dont need it currently for my work

[Paul]

Maybe you're looking for the functionality of the Parameter Writer block?

Answer 1

[Fangjun Jiang]

Access Data in a MATLAB Function During Simulation

[Luke Chapman]

Hi so I do this and it works as far as I can get the logged signal to be displayed in the command line from the function. The input to the function I have called u so simply I have:

function RemoLoc(u,time)

u

end

This prints the value of u as the signal changes. However it does not store the variable in the workspace i.e I cannot see u in my workspace. It needs to be in my workspace stored as a variable for me to retrieve the value from the EA software. Does this make sense?

[Luke Chapman]

Never mind I have used "assignin('base','y',u);" to store the value of u at variable y in the workspace. I will now attempt to retrieve this value in EA. Cheers.

[Luke Chapman]

Do you know if I can use the same function for two different logged signals? If so how do you ensure the correct input is taken for each signal. For example if you have one signal that is telling you whether a motor is running which would have input to the function R and and one signal that is telling you if the motor is available which would have input to the function A. how can you ensure the function takes the correct inputs?

[Fangjun Jiang]

The doc says "Your callback function can be specific to a single signal, or you can use the same callback to process and visualize multiple signals. The callback function only has access to data for a single signal at a time. "

[Fangjun Jiang]

Route those two signals together to make a nonvirtual bus. Make it nonvirtual or convert it to nonvirtual.

https://www.mathworks.com/help/simulink/slref/convert-virtual-bus-to-nonvirtual-bus.html