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In OpenSCADA this mechanism is implemented by the following modules of the subsystem "DAQ":

  • DAQGate — module of the reflection of controller objects of the remote OpenSCADA-stations on the local one. In the module the asynchronous mode of reading data is implemented.
  • System — module of accessing the data of the execution area of OpenSCADA. In the module the asynchronous mode of reading data is implemented.
  • ModBus — module of accessing the data sources through the "ModBus" protocols family. In this module the asynchronous mode is implemented both for the data reading and recording (optional) to the PLC.
  • SNMP — module of accessing the data of the network devices through "the Simple Network Management Protocol". In the module the asynchronous mode of reading data is implemented.
  • Siemens — module of accessing the data of Siemens controllers of the S7 series. In this module the asynchronous mode is implemented both for the data reading and recording (optional) to the PLC.