I see several ways to achieve this.
1. You could store your Entity Generator block with the required Enty Type definition in a Simulink library. So each time you pick the block from the library, it is already configured as expected.
2. With a script, you could find all existing Entity Generator blocks in your current model and modify all Entity Type definitions:
blocks = string(find_system(bdroot, "BlockType", "EntityGenerator"));
for idx = 1:numel(blocks)
set_param(blocks(idx), ...
"EntityType", "Structured", ...
"AttributeName", "data1|data2|data3", ...
"AttributeInitialValue", "1|2|3");
end
3. You could use a Bus object to store the Entity type. However it doesn't allow to define a non-zero initial value, and you still have to use an event action to set the initial value (can also be done by script though).
