Help on Matlab Simulink

Hello. I'm new to using simulink. I'm trying to create a model where if the input is not equal to a certain number, it substracts 1 contionously from it.

An example from my work is shown below. In the first picture, when the input is equal to 30, the output is 30. But if the input is not equal to 30, then it will continously subtract 1 from it. The problem is when it starts to subtract. It starts from 0 rather than the input value. In my model, it starts to subtract 1 from 0 rather than 31. I want my model to subtract 1 from 31. The output is show in the 2nd picture.

Any help would be much appreciated.

Answer 1

[Jonas]

Set the initial value of the 1/z Unit Delay block to 31.