The parametering of the Function block appears through specification of the boost factors GAIN as well as the parametering of the Derivative time constants LEAD and the delay time constants LAG.

For very small sample times and the unit jump to input IN (jump at line-in IN from 0 to 1.0) output OUT will jump to the value (theoretical value - actual slightly smaller, due to the not infinitely small sample times), using the time constant LAG to approximate the value closer.