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2. SCADA systems and their structure.

Scada-system. (145 Кб)
Fig. 2. SCADA-system.

SCADA (Supervisory Control And Data Acquisition), in a general view, have the allocated architecture like represented on fig. 2. Elements of SCADA systems, in sense of the software, carry out following functions:
The acquisition server: represents a task or group of tasks engaged in data acquisition from sources of data, or act in a role as a source of data. Into tasks of a server enters:

The server of archiving: represents a task or group of tasks engaged in archiving of data. Into tasks of the server enters:

The journaling server: represents a task or group of tasks engaged in archiving of messages. Into tasks of the server enters:

The alarm server: represents a task or group of tasks carrying out functions of the server of recording concerning a narrow category of messages of the signal system.
The operator working place: represents constantly functioning GUI (Grafical User Interface) application executed in an one-monitor, multimonitor or panel mode and carrying out functions:

The engineer working place: represents GUI application used for configuration of SCADA system. Into tasks of the application enters:

The chief working place: represents GUI application, as a rule, executed in an one-monitor mode and carrying out functions:

The technologist working place: completely includes functions of a workplace of the operator plus model of technological process (without direct communication with technological process).
The work planner working place: completely includes functions of a workplace of the technologist plus toolkit for creation of models of technological processes.


 
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