This behaviour of renumbering of the blocks occurs due to how Simulink manages unique identifiers for blocks when the model is loaded. You may use the following strategies to prevent it:
1.Instead of relying on automatic numbering, the variable names in the “To Workspace” blocks can be manually set to prevent renumbering.
2. Model callbacks (such as “PreLoadFcn” or “PostLoadFcn”) can be used to programmatically set the variable names of the “To Workspace” blocks when the model is loaded. You may refer to the following link to know more about model callbacks: https://www.mathworks.com/help/simulink/ug/model-callbacks.html
% Set this code in the model's PreLoadFcn callback
blocks = find_system(bdroot, 'BlockType', 'ToWorkspace');
for i = 1:length(blocks)
set_param(blocks{i}, 'VariableName', ['output_' num2str(i)]);
end
This script should be manually run after loading the model to set the variable names.
3. A custom MATLAB script can be created that runs each time the model is loaded. This script should iterate through the ‘Subsystem reference blocks’ and set the variable names for the “To Workspace” blocks according to the desired naming convention.
% Custom script to set variable names for "To Workspace" blocks
model = 'your_model_name';
load_system(model);
blocks = find_system(model, 'BlockType', 'ToWorkspace');
for i = 1:length(blocks)
set_param(blocks{i}, 'VariableName', ['output_' num2str(i)]);
end
This code is automatically executed every time the model is loaded, ensuring variable names are set consistently without manual intervention.
4. A ‘Simulink Data Dictionary’ can be used to manage and store variable names centrally, thus maintaining consistency across model loads. You may refer to the following link for more information:
Hope this helps, cheers!
