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In accordance with the diagram above, we obtain the following behavior of the passive mechanism:

  • data source object carries out periodic connection sessions with the parameter attribute DAQParamAttributeArch::setVal() to transfer its own data and receive influence commands;
  • object of the SCADA-system sends the request to the last value of the parameter attribute DAQParamAttribute::getVal() and gets the locally stored value of the previous connection session of the data source.
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