About DCS
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A distributed control system (DCS) distributes control elements throughout a plant or process as opposed to using a single centralized controller. A DCS uses custom processors as controllers and proprietary and standard communication protocols to connect components. DCS systems are commonly used in industries like oil refineries, power plants, manufacturing facilities, and more.
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A distributed control system (DCS) is described. Key points:
- A DCS uses sensors, controllers, and computers distributed throughout a plant and connected by a local network. It makes automated decisions in real-time to control complex production processes.
- DCS are commonly used in large, continuous process plants like petrochemical facilities to efficiently coordinate control on a centralized network.
- Compared to alternative options like PLCs, DCS are preferred because the manufacturer provides both controller and supervisory functions in an integrated package.
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SCADA (Supervisory Control and Data Acquisition) systems are used to monitor and control infrastructure like power grids, water treatment plants, and oil and gas pipelines. A typical SCADA system includes remote terminal units that collect data from sensors and control equipment in the field, a communication system to transmit data to a central control room, and human-machine interfaces that allow operators to monitor and manage the infrastructure. SCADA systems improve efficiency by automating monitoring and control functions while also enhancing reliability through features like remote access, data logging, and alarm notifications.
Lecture+9+-+SCADA+Systems.pdf
This document provides an overview of SCADA systems and their application in power system operation and control. It discusses:
- How SCADA systems enable centralized monitoring and control of dispersed power system assets under deregulated electricity markets.
- The typical components of a SCADA system including the human-machine interface, application servers, communication servers, remote terminal units, and communication infrastructure.
- The main functions of SCADA systems including data acquisition, event and alarm processing, control capabilities, data storage and analysis.
- Communication protocols commonly used in SCADA systems like DNP3, IEC 60870-5-101/104, and IEC 60870-6 for
SCADAs role in getting the DWS there_a
This document discusses how SCADA (Supervisory Control and Data Acquisition) systems can help drinking water organizations comply with the Drinking Water Standards for New Zealand (DWSNZ). SCADA systems measure and acquire data from water infrastructure over distances and play an important role in monitoring water quality parameters, issuing alarms if standards are exceeded, controlling treatment systems, and reporting data. The document outlines the typical components of a SCADA system, including plants, instrumentation, remote terminals, communication systems, data processing, storage and reporting. It also discusses challenges water organizations face in using SCADA to meet DWSNZ requirements and ensuring data validity, adequate sampling rates, and traceability.
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About DCS
- 1. A distributed control system (DCS) is a control system for a process or plant, wherein control elements are distributed throughout the system. This is in contrast to non-distributed systems, which use a single controller at a central location. A DCS typically uses custom designed processors as controllers and uses both proprietary interconnections and standard communications protocol for communication. Block Diagram of DCS Industries where a DCS might be used include: • Petrochemical (oil) and refineries • Boiler controls and power plant • Nuclear power plants • Metallurgical process plants • Pharmaceutical manufacturing • Water management systems • Sugar refining plants Communication Protocols Used IEC101 / 104 - IEC 101 / 104 is one of the IEC 60870 set of standards which define systems used for telecontrol (supervisory control and data acquisition - SCADA) in electrical engineering and power system automation applications. OPC - OPC is a widely accepted industrial communication standard Client / Server technology that enables the exchange of data between multi-vendor devices and control applications without any proprietary restrictions. Modbus - Modbus protocol supports serial communication among many (approximately 247) devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems.