Datastor Systems Ltd Specialise in the design and configuration of SCADA systems, we currently see the Rockwell Factory Talk, Siemens WinCC, GE iFix & Wonderware Intouch as the mainstream systems in today’s market place. Dependent on your preference we are also able to configure and modify many other SCADA packages.
System Overview
The term SCADA usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas. Most control actions are performed automatically by programmable logic controllers (“PLC’s”). 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, however 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 temperature, to be displayed and recorded. The feedback control loop passes through the PLC, while the SCADA system monitors the overall performance of the loop.
Data acquisition begins at the PLC level and includes meter readings and equipment status reports that are communicated to SCADA as required. Data is then compiled and formatted in such a way that a control room operator using the HMI can make supervisory decisions to adjust or override normal PLC controls. Data may also be fed to a Historian, often built on a commodity Database Management System, to allow trending
