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Presentation transcript:

(Jalil Ahmed) www.swedishcr.weebly.com

Topics of presentation SCADA DCS (Jalil Ahmed) www.swedishcr.weebly.com

Prepared By Jalil Ahmed Syed Irfan Haider Saeed Qadir Ahsan Ali Zaigham Abbas (Jalil Ahmed) www.swedishcr.weebly.com

Supervisory Control and Data Acquisition Scada Supervisory Control and Data Acquisition (Jalil Ahmed) www.swedishcr.weebly.com

Introduction Acronym stands for Supervisory Control and Data Acquisition Not a full control system, but rather focuses on the supervisory level Purely software package that is positioned on top of hardware Combination of telemetry and data acquisition to which it is interfaced, generally via (PLCs) or (DCS) Collecting of the information, transferring it back to the central site, carrying out any necessary analysis and control and then displaying that information on a number of operator screens or displays control actions are then conveyed back to the process. (Jalil Ahmed) www.swedishcr.weebly.com

Introduction……. (Jalil Ahmed) www.swedishcr.weebly.com

Introduction……. (Jalil Ahmed) www.swedishcr.weebly.com

Introduction….. (Jalil Ahmed) www.swedishcr.weebly.com

Introduction……. SCADA systems are designed to collect field information, transfer it to a central computer facility, and display the information to the operator graphically or textually, thereby allowing the operator to monitor or control an entire system a central location in real time. (Jalil Ahmed) www.swedishcr.weebly.com

Intro….. All together, the term SCADA refers to the entire central system. The central system usually monitors data from various sensors that are either in close proximity or off site. (Jalil Ahmed) www.swedishcr.weebly.com

Applications of scada Electric power generation, transmission and distribution: Water and sewage: Buildings, facilities and environments: Manufacturing: Mass transit: Traffic signals: (Jalil Ahmed) www.swedishcr.weebly.com

SCADA architecture Three generations of SCADA systems: First Generation Monolithic Second Generation Distributed Third Generation Networked (Jalil Ahmed) www.swedishcr.weebly.com

Monolithic SCADA Systems: (Jalil Ahmed) www.swedishcr.weebly.com

Distributed SCADA Systems: (Jalil Ahmed) www.swedishcr.weebly.com

Networked SCADA Systems: (Jalil Ahmed) www.swedishcr.weebly.com

Components of SCADA System Hardware SCADA system involves essentially five levels or hierarchies(System): Field level instrumentation and control devices Marshalling terminals and RTUs Communications system The master station(s) The commercial data processing department computer system (Jalil Ahmed) www.swedishcr.weebly.com

Components of SCADA System SCADA Software: SCADA may be classified as: Propriety: Companies develop proprietary software to communicate to their hardware. Open: They have high interoperability to mix different manufacturers’ equipment on same system. (Jalil Ahmed) www.swedishcr.weebly.com

Key features of SCADA software User interface Graphics displays Alarms Trends RTU (and PLC) interface Scalability Access to data (Jalil Ahmed) www.swedishcr.weebly.com

Key features of SCADA software…… Database Networking Fault tolerance and Redundancy Client/server Distributed processing (Jalil Ahmed) www.swedishcr.weebly.com

SCADA Works SCADA system performs four functions: 1. Data acquisition 2. Networked data communication 3. Data presentation 4. Control These functions are performed by four kinds of SCADA Components: 1. Sensors and control relays 2. Remote telemetry units (RTUs) 3. SCADA master units 4. Communications network (Jalil Ahmed) www.swedishcr.weebly.com

Considerations and benefits of SCADA system • Overall control requirements • Sequence logic • Analog loop control • Ratio and number of analog to digital points • Speed of control and data acquisition • Master/operator control stations • Reliability/availability • Speed of communications/update time/system scan rates • System redundancy • Expansion capability (Jalil Ahmed) www.swedishcr.weebly.com

Distributed Control System DCS Distributed Control System (Jalil Ahmed) www.swedishcr.weebly.com

DCS Introduction A type of automated control system that is distributed throughout a machine to provide instructions to different parts of the machine. Instead of having a centrally located device controlling all machines, each section of a machine has its own computer that controls the operation. For instance, there may be one machine with a section that controls dry elements of cake frosting and another section controlling the liquid elements, but each section is individually managed by a DCS. A DCS is commonly used in manufacturing equipment and utilizes input and output protocols to control the machine. (Jalil Ahmed) www.swedishcr.weebly.com

Distributed Control System (DCS) (Jalil Ahmed) www.swedishcr.weebly.com

DCS Elements Local Control Unit This unit can handle 8 to 16 individual PID loops. Data Acquisition Unit Digital (discrete) and analog I/O can be handle. Batch Sequencing Unit This unit controls a timing counters, arbitrary function generators, and internal logic. Local Display This device provides analog display stations, and video display for readout. Bulk Memory Unit This unit is used to store and recall process data. (Jalil Ahmed) www.swedishcr.weebly.com

DCS Elements General Purpose Computer : Central Operator Display This unit is programmed by a customer or third party to perform optimization, advance control, expert system etc. Central Operator Display This unit typically contain several consoles for operator communication with the system, and multiple video color graphics display units Data Highway A serial digital data transmission link connecting all other components in the system. It allow for redundant data highway to reduce the risk of data loss Local area Network (LAN) (Jalil Ahmed) www.swedishcr.weebly.com

Advantages of DCS Access a large amount of current information from the data highway. Monitoring trends of past process conditions. Readily install new on-line measurements together with local computers. Alternate quickly among standard control strategies and readjust controller parameters in software. A sight full engineer can use the flexibility of the framework to implement his latest controller design ideas on the host computer. Digital DCS systems are more flexible. Control algorithms can be changed and control configuration can be modified without having rewiring the system. (Jalil Ahmed) www.swedishcr.weebly.com

Advanced control topology (Jalil Ahmed) www.swedishcr.weebly.com

Functional levels of a typical Distributed Control System. (Jalil Ahmed) www.swedishcr.weebly.com

(Jalil Ahmed) www.swedishcr.weebly.com