Scada

Topics: SCADA, Programmable logic controller, Automation Pages: 12 (3857 words) Published: September 15, 2013
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Term Paper of ECE 219

Topic: Supervisory Control and Data Acquisition

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ACKNOWLEDGEMENT

I acknowledge our great indebtness to all those who have helped us a lot in the preparation of this project. I’d like to special thanks to my teacher Mrs. Puneet mam that he motivated us at every step of making this project. Without their help and support, this project could not have been possible. I also like to thanks to all our friends who have helped me in searching for the information. So I thank them too. PrasantH kumar chowdary..
Contents:
1. Introduction
2. System Components
3. Description
4. Hardware Solutions
5. Applications
6. Advantages and Disadvantages
7. References

Introduction:
SCADA (supervisory control and data acquisition) is a type of industrial control system (ICS). Industrial control systems are computer controlled systems that monitor and control industrial processes that exist in the physical world. SCADA systems historically distinguish themselves from other ICS systems by being large scale processes that can include multiple sites, and large distances. These processes include industrial, infrastructure, and facility-based processes, as described below:

* Industrial processes include those of manufacturing, production, power generation, fabrication, and refining, and may run in continuous, batch, repetitive, or discrete modes * Infrastructure processes may be public or private, and include water treatment and distribution, wastewater collection and treatment, oil and gas pipelines, electrical power transmission and distribution, wind farms, civil defence siren systems, and large communication systems. * Facility processes occur both in public facilities and private ones, including buildings, airports, ships, and space stations. They monitor and control heating, ventilation, and air conditioning systems (HVAC), access, and energy consumption.

System Components:
A SCADA system usually consists of the following subsystems: * A human–machine interface or HMI is the apparatus or device which presents process data to a human operator, and through this, the human operator monitors and controls the process. * SCADA is used as a safety tool as in lock-out tag-out

* A supervisory (computer) system, gathering (acquiring) data on the process and sending commands (control) to the process. * Remote terminal units (RTU) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system. * Programmable logic controller (PLC) used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTU. * Communication infrastructure connecting the supervisory system to the remote terminal units. * Various process and analytical instrumentation.

Description:
The term SCADA usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas anything from an industrial plant to a nation). Most control actions are performed automatically by RTUs or by PLCs. Host control functions are usually restricted to basic overriding or supervisory level intervention. For example, a PLC may control the flow of cooling water through part of an industrial process, but the SCADA system may allow operators to change the set points for the flow, and enable alarm conditions, such as loss of flow and high...

References: * http://www.controlsysinc.com/SCADAApplications.htm
* http://en.wikipedia.org/wiki/SCADA
* http://www.dpstele.com/dpsnews/techinfo/scada/applications_of_scada.php
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