I want to find a peak value from a dynamic signal in simulink

A moving signal is attending maximum value at t sec from a complete cycle. I am using "minmax resettable block" but not able to use it correctly. The max value given by this block is not the actual peak value attend and observed in graph.

I think i am making mistake in reset signal input R (if it is needed) and what should be the initial value in the block ? Default is 0.0