Stateflow output bus signal failure

Background:

1, There was a case that stateflow would send bus output with simulink state(simulink model in state flow)

Error information :

Data type mismatch. Output 'signal_a_m' of chart 'Chart2' is mapped to an atomic subchart output of a different type.

(the situation was I already set both stateflow and simulink with same data type, I really could not git this point)

Answer 1

[chen]

simulink state as below: