Step
A Step function () is a sharp transition from 0 to some other value (amplitude) at some location (a certain time, for example). Create a single step function with a certain amplitude from an initial level to a final level at a start location. The step function is a function of one variable (the time t, for example). The default Function name is step1.
Parameters
Enter a Location (s0) for the start of the step. The value of the step function is the start level for input values that are smaller than the location of the step. In the From field, enter a start level (Lstart ). In the To field, enter a final level (Lend). For an input variable s, a start location s0, a start level Lstart, and a final level Lend, the step function’s value is Lstart for s < s0 and Lend for s ≥ s0. The amplitude of the step is Lend −  Lstart. You can use unit syntax to assign units to these parameters.
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See Function Names and Calling Functions for information about the Function name section.
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See Common Settings for the Function Nodes for information about the Smoothing section in addition to the Location definition list.
Smoothing
From the Location definition list, define the location of the smoothing: Middle of step (the default), Beginning of step, or End of step. Using the Beginning of step option can be useful for initialization purposes, for example.