Library Modelica_Synchronous is a Modelica package to precisely define and synchronize sampled data systems with different sampling rates. The library has elements to define periodic clocks and event clocks that trigger elements to sample, sub-sample, super-sample, or shift-sample partitions synchronously. Optionally, quantization effects, computational delay or noise can be simulated. Continuous-time equations can be automatically discretized and utilized in a sampled data system. The sample rate of a partition need to be defined only at one location. All Modelica libraries designed so far for sampled systems, such as Modelica.Blocks.Discrete or Modelica_LinearSystems2.Controller are becoming obsolete and instead Modelica_Synchronous should be utilized.

In the following example a simple sampled data system is shown, where the borders of the discrete-time partition are marked by the sample and hold operators, a clocked PI controller is used in the partition and the sample rate is defined at one location with a clock:

For an introduction, have especially a look at:

• Modelica_Synchronous.pdf is a slide set that provides an overview of the Library (the pdf file was generated from the PowerPoint presentation).
• Getting started provides an overview of the Library inside the User's Guide.
• Release Notes summarizes the changes of new versions of this package.
• Contact gives author and acknowledgement information for this library.

	Licensed by the Modelica Association under the Modelica License 2
	Copyright © 2012-2019, DLR Institute of System Dynamics and Control

This Modelica package is free software and the use is completely at your own risk; it can be redistributed and/or modified under the terms of the Modelica license 2, see the license conditions (including the disclaimer of warranty) here or at http://www.Modelica.org/licenses/ModelicaLicense2.