blockZeroCrossing

Trigger zero crossing of input u
Diagram of ZeroCrossingOpen the diagram
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Extends from Modelica.Icons.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions).

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.

Connectors

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Interfaces.RealInputuConnector of Real input signal
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutputyConnector of Boolean output signal
Buildings.Controls.OBC.CDL.Interfaces.BooleanInputenableZero input crossing is triggered if the enable input signal is true

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.