SCADA systems on the other hand generally cover larger geographic areas, and rely on a variety of communications systems that are normally less reliable than a LAN. Closed loop control in this situation is less desirable. SCADA systems are used for controlling and monitoring chemical or transport processes and can be used in a factory environment such as electric power generation, water supply systems, gas and oil pipelines or any other distributed processes.
SCADA system is normally used to monitor and control a remote site or a distribution that is spread out for a long distance. The SCADA system also provides a host control functions for the supervisor to control and define settings.
At the same time the supervisor can use the Host control function to set the temperature for the flow of water. It can also have alarms and can record the flow of water temperature and report back to the SCADA system. This data can be stored in a database for later analysis or monitored by a supervisor to take appropriate actions if required. SCADA systems typically implement a distributed database, commonly referred to as a tag database, which contains data elements called tags or points.
A point represents a single input or output value monitored or controlled by the system. A hard point is representative of an actual input or output connected to the system, while a soft point represents the result of logic and math operations applied to other hard and soft points.
Point values are normally stored as value-timestamp combinations; the value and the timestamp when the value was recorded or calculated. A series of value-timestamp combinations is the history of that point. You can also follow us on Facebook and Twitter to receive daily updates. Don't Miss Our Updates. Be the first to get exclusive content straight to your email. PLCs i. A connection between data servers and client stations is done through an Ethernet LAN. The below figure shows diagrammatic representation of typical hardware architecture.
Fig1: Typical Hardware Architecture. Servers perform tasks like data acquisition and handling. For example, tasks which come under data acquisition and handling are logging, archiving, calculations, alarm checking, and polling controllers. Software architecture does the following communications:. All you need to do is just click on the download link and get it. Scada pdf Report Free Download. If you liked it then please share it or if you want to ask anything then please hit the comment button.
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