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Architecturally, OpenSCADA consists of the subsystems:

  • Security — contains lists of users and groups of users, provides check of the rights of access to the program elements, etc.
  • Modules Scheduler — provides the control over modules.
  • Data Bases (modular) — provides access to databases.
  • Transports (modular) — provides communications with external environment by means of various communication interfaces.
  • Transport Protocols (modular) — closely connected with the transports subsystem and provides support of various exchanging protocols between external systems.
  • Data Acquisition (modular) — provides data acquisition from external sources: controllers (PLC), sensors, etc. In addition, the subsystem can provide an environment for creating data generators: simulators, controllers (PLC), ... .
  • Archives-Histories (modular) — contains of archives-history of two types: message and value archives. The method of archiving is determined by the algorithm that is provided in the archiving module.
  • User Interfaces (modular) — contains functions of the user interfaces.
  • Specials (modular) — contains functions that are not included in the other subsystems. Currently, these functions include test functions and libraries of static functions of the user API.