How can I disable signal logging across an entire Simulink model?

How can I disable signal logging across an entire Simulink model, including any library-linked sub-models or reference models? Additionally, how can I achieve this if the Simulink model contains reference and library models within variant subsystems?

Answer 1

[MathWorks Support Team]

In MATLAB, while there's no single command to disable signal logging across the entire model, including any library-linked sub-models or reference models, you can achieve this with a script that iterates through all the blocks in the model hierarchy. Please refer to the general approach mentioned in the following MATLAB script:

function disableSignalLogging(modelName)
    % Load the model if it is not already loaded
    if ~bdIsLoaded(modelName)
        load_system(modelName);
    end
    
    % Get all blocks in the model, including library links and referenced models
    allBlocks = find_system(modelName, 'FollowLinks', 'on', 'LookUnderMasks', 'all', 'Type', 'Block');
    
    % Iterate through all blocks and disable signal logging
    for i = 1:length(allBlocks)
        try
            % Disable signal logging for the current block
            set_param(allBlocks{i}, 'DataLogging', 'off');
        catch
            % If the block does not support signal logging, continue
            fprintf('Skipping block: %s\n', allBlocks{i});
        end
    end
    
    % Save and close the model if necessary
    save_system(modelName);
    % close_system(modelName);
end

If the Simulink model contains reference and library models within variant subsystems, you need to traverse the active variant configurations and apply a similar logic recursively to ensure that all signal logging is disabled. Please refer to the example MATLAB script below for a general approach:

function disableSignalLogging(modelName)
    % Load the model if it is not already loaded
    if ~bdIsLoaded(modelName)
        load_system(modelName);
    end
   
    % Disable signal logging recursively
    disableLoggingRecursive(modelName);
   
    % Save and close the model if necessary
    save_system(modelName);
    close_system(modelName);
end
function disableLoggingRecursive(systemName)
    % Get all blocks in the system
    allBlocks = find_system(systemName, 'FollowLinks', 'on', 'LookUnderMasks', 'all', 'Type', 'Block');
   
    for i = 1:length(allBlocks)
        try
            % Disable signal logging for the current block
            set_param(allBlocks{i}, 'DataLogging', 'off');
        catch
            % If the block does not support signal logging, continue
            fprintf('Skipping block: %s\n', allBlocks{i});
        end
       
        % Check if the block is a Variant Subsystem
        if strcmp(get_param(allBlocks{i}, 'BlockType'), 'SubSystem') && ...
                strcmp(get_param(allBlocks{i}, 'Variant'), 'on')
            % Get the active variant choice
            activeVariant = get_param(allBlocks{i}, 'VariantControl');
            if ~isempty(activeVariant)
                % Recurse into the active variant subsystem
                disableLoggingRecursive(activeVariant);
            end
        end
       
        % Check if the block is a Model Reference
        if strcmp(get_param(allBlocks{i}, 'BlockType'), 'ModelReference')
            % Get the referenced model name
            refModelName = get_param(allBlocks{i}, 'ModelName');
            % Recurse into the referenced model
            disableLoggingRecursive(refModelName);
        end
    end
end

Usage Guidelines:

• Load Your Model: Ensure your model is loaded in MATLAB.
• Run the Script: Call the function "disableSignalLogging(<your_model_name>)" with the name of your top-level model in the MATLAB Command Window.

Please note that this script will affect all blocks that support signal logging, so use it cautiously if you need to maintain logging for specific blocks. If you have custom blocks or specific configurations, you may need to adjust the script accordingly.