Session 17 - SCADA Introduction
- 1. Control System Training – Session 17 SCADA Introduction
- 2. Page 2Classification: Restricted Agenda: • SCADA – An Overview
- 3. Page 3Classification: Restricted SCADA OVERVIEW • SCADA stands for ‘Supervisory Control and Data Acquisition’. • SCADA is a software system used for monitoring, controlling and analyzing industrial processes. • The SCADA system communicates with the controllers( PLC or Remote Terminal Unit-RTU) which are actually running the process. • The controllers receive the signals from field devices and controls the process according to the programs downloaded into them. • SCADA systems communicates with the controllers in the field and collects the actual field data. These data are then brought to the SCADA system and shown through Graphical User Interface(GUI) to the operators in the field. • The operators use these graphical representations to understand what is happening in the process and provide the necessary control. • SCADA software also provides options to enter settings through graphical displays, allows the operators to view alarms, trends and other historical Sdata.
- 4. Page 4Classification: Restricted SCADA OVERVIEW • SCADA products have been produced that are generic with a ‘one shoe fits all’ approach to various markets i.e. one SCADA software is compatible with various brands of PLCs • These types of SCADA systems are used extensively throughout the Oil & Gas market due to the fact that assets are spread over large geographical areas. The other industries where the SCADA is used is the Water and Waste Management system, Food and Beverage industries, power plants, etc.
- 5. Page 5Classification: Restricted SCADA OVERVIEW
- 6. Page 6Classification: Restricted SCADA OVERVIEW • In the overall structure of a SCADA system, there are four distinct levels within SCADA, these being; • Field instrumentation • PLCs and / or RTUs • Communications networks • SCADA host software.
- 7. Page 7Classification: Restricted SCADA OVERVIEW
- 8. Page 8Classification: Restricted SCADA OVERVIEW Field Instrumentation Instrumentation is a key component of a safe and optimized control system. Traditionally, pumps and their corresponding operational values would have been manually controlled i.e. an operator would start/stop pumps locally and valves would have been opened/closed by hand. Slowly over time, these instruments have been fitted with feedback sensors, such as limit switches, providing connectivity for these wired devices into a local PLC or RTU, to relay data to the SCADA host software. PLC AND RTU The PLC and the RTU are the actual devices that are connected to the field devices. These devices receive data from the field devices and then transmit it to the SCADA where the monitoring and control of field devices is done.
- 9. Page 9Classification: Restricted SCADA OVERVIEW REMOTE COMMUNICATIONS NETWORKS The remote communication network is necessary to relay data from remote RTU/PLCs, which are out in the field , to the SCADA host located at central control center. With process distributed over a large geographical area, communication is the important part of a SCADA system and essential for operation. SCADA HOST SOFTWARE With development SCADA Host software platforms have many new features. These included the development of integral databases specifically designed for SCADA Host software requirements. SCADA today are able to handle thousands of changes a second, for really large systems, yet still conform to standard database interfacing such as Open Database Connectivity (ODBC) and Object Linking and Embedding for Databases (OLE DB).
- 10. Page 10Classification: Restricted SCADA OVERVIEW These standards are required so that third-party databases can access data from the SCADA Host software. Remote client access to the SCADA Host is another technology that has enabled users to operate and monitor SCADA systems while on the move between or at other locations. SCADA Software Brands Some of the SCADA soft wares used are, • Wonderware Intouch • GE-Intellution Fix • GE-Cimplicity • WinCC • RS View32
- 11. Page 11Classification: Restricted SCADA OVERVIEW Graphical User Interface designed in SCADA software
- 12. Page 12Classification: Restricted Topics to be covered in the next session: • SCADA – Properties 1