Hi Feng,
In Simulink, the Bus Selector block requires the structure of the input bus (the names and number of signals) to be defined at design time. It does not support dynamic adaptation to arbitrary bus structures at runtime. For a library function to work with different bus types, you must define a bus object that includes all possible signals you might need (the union of all fields) and configure the Bus Selector to select from these. If some signals are unused in a particular context, they can be left unconnected or set to default values. True dynamic selection based on the incoming bus structure is not supported; the bus structure must be fixed and known when you build the library function.
Refer to below documentation for more information:
Hope this helps!
