How to list the names of all the output ports in a model, including the output ports of subsystem?

I want to list the output parameters of all the output ports of model which contains subsystem with output ports.

[Aquatris]

Do you read the output signals or do you want to get the properties of output ports?

[digvijaysingh]

Hi Aquatris,

I want to first list the outputs of all ports and later observe them for testing.

Answer 1

[Namnendra]

Hi Digvijay,

To list the output parameters of all the output ports of a model, especially when it contains subsystems with their own output ports, you can use MATLAB scripting to programmatically access and display this information. This approach allows you to navigate through the model hierarchy and gather details about each output port in the model and its subsystems.

The following MATLAB script provides a basic framework for achieving this. It recursively explores a Simulink model, identifies subsystems, and lists the output ports along with any parameters or signal names associated with them.

function listOutputPorts(modelName)
% Lists the output parameters of all output ports in the specified model
% and its subsystems.

% Load the model into memory (does not open the UI)
load_system(modelName);

% Start the recursion from the top level of the model
recurseBlocks(get_param(modelName, 'Handle'));

% Unload the model from memory
% close_system(modelName);

    function recurseBlocks(block)
        % Recursively explores blocks and subsystems to find and list output ports
        
        % Get all blocks in the current level
        blocks = find_system(block, 'SearchDepth', 1, 'FollowLinks', 'on', 'LookUnderMasks', 'all');
        
        for i = 1:length(blocks)
            % Skip the input block itself to avoid redundancy
            if blocks{i} == block
                continue;
            end
            
            % Check if the block is a SubSystem (excluding virtual blocks like subsystems)
            if strcmp(get_param(blocks{i}, 'BlockType'), 'SubSystem') && ...
                    ~strcmp(get_param(blocks{i}, 'TreatAsAtomicUnit'), 'off')
                % If it's a subsystem, recurse into it
                recurseBlocks(blocks{i});
            else
                % For each block, check if it has output ports
                ports = get_param(blocks{i}, 'PortHandles');
                outPorts = ports.Outport;
                
                for j = 1:length(outPorts)
                    % For each output port, print its block name and port number
                    % Additional parameters can be accessed as needed
                    signalName = get_param(outPorts(j), 'Name');
                    fprintf('Block: %s, Output Port: %d, Signal Name: %s\n', get_param(blocks{i}, 'Name'), j, signalName);
                end
            end
        end
    end
end

How to Use This Script

1. Save the script to a file named `listOutputPorts.m`.

2. In MATLAB, navigate to the directory where you saved the script.

3. Run the script with the name of your Simulink model as the argument. For example, if your model is named `myModel`, you would call:

listOutputPorts('myModel');

Notes:

- This script loads the specified model into memory but does not open the Simulink UI. If you prefer to also open the model, you can use `open_system(modelName)` instead of `load_system(modelName)`.

- The script currently lists the block name, output port number, and the signal name associated with each output port. You can modify the `fprintf` line to include additional parameters as needed.

- The script uses a recursive approach to handle nested subsystems, ensuring that all levels of the model hierarchy are explored.

Remember to replace `'myModel'` with the actual name of your Simulink model. This script provides a starting point and can be extended or modified based on your specific requirements, such as accessing different parameters or handling special block types.

I hope the above steps help you in your task.

Thank you.