#System architect software
Master station or supervisory station comprises a single PC in smaller SCADA systems and, in case of larger SCADA systems, supervisory system comprises distributed software applications, disaster recovery sites and multiple servers. Supervisory system is used as server for communicating between the equipment of the SCADA system such as RTUs, PLCs and sensors, etc., and the HMI software used in the control room workstations. Consider the block diagram of SCADA system shown in the figure which consists of different blocks, namely Human-machine Interface (HMI), Supervisory system, Remote terminal units, PLCs, Communication infrastructure and SCADA Programming. SCADA Basicsīefore discussing about the architecture of SCADA and different types of SCADA systems, primarily we must know a few SCADA basics. But the recent advancements in technology have made-advanced, automated SCADA systems with maximum efficiency at reduced cost, according to the alarming requirements of the company. Early systems built using mainframe computers were expensive as they were manually operated and monitored.
SCADA system usage have became popular from the 1960s with the increase in need of monitoring and controlling the equipment. One or more computers are located at different centralized control and monitoring points. Data is transmitted from the PLCs and other devices to a computer-based-SCADA node located at each substation. In general, for controlling and monitoring a substation in real time (PLCs) Programmable Logic Controllers, Circuit breakers and Power monitors are used.
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