How to implement Ehd in Simulink as shown below?(simulation)

How to implement Ehd in Simulink as shown below?

Eh0=200, Ehf=0, a=0.055, t=100,

Ehd=(Eh0-Ehf)*exp(-at)+Ehf

Where is the problem in Simulink below?

Answer 1

[Walter Roberson]

All of your inputs are constant. The result is going to be constant. Your t should be driven by the clock rather than being a constant.

[af af]

thanks