.Buildings.Obsolete.Controls.OBC.CDL.Logical.ZeroCrossing

Information

Block that detects zero crossings.

The output y is true at the time instant when the input u becomes zero, provided the input enable is true. At all other time instants, the output y is false. If the input u is zero at a time instant when the enable input changes its value, then the output y is false.

Note, that in the plot window of a Modelica simulator, the output of this block is usually identically to false, because the output may only be true at an event instant, but not during continuous integration. In order to check that this component is actually working as expected, one should connect its output to, e.g., component Buildings.Controls.OBC.CDL.Discrete.TriggeredSampler.

Revisions

• December 8, 2023, by Jianjun Hu:
  Moved this model to the Obsolete package. This is for issue 3595.
• January 3, 2017, by Michael Wetter:
  First implementation, based on the implementation of the Modelica Standard Library.