This information is part of the Modelica Standard Library maintained by the Modelica Association.

This blocks computes the output y as sign of the input u:

         1  if u > 0
    y =  0  if u == 0
        -1  if u < 0

The Boolean parameter generateEvent decides whether Events are generated at zero crossing (Modelica specification before 3) or not.

generateEvent	Value: false Type: Boolean Description: Choose whether events shall be generated