Programmable Logic Controllers Scalable for Small to Large Application. SCADA is a control system architecture comprising computers, networked data communications and graphical user interfaces for high-level supervision of machines and processes. It also covers sensors and other devices, such as Programmable Logic Controllers, which interface with process plant or machinery. The system consists of both software and hardware components and enables remote and on-site gathering of data from the industrial equipment. Modern SCADA systems allow real-time data from the plant floor to be accessed from anywhere in the world. This access to real-time information allows governments, businesses, and individuals to make data-driven decisions about how to improve their processes. Without SCADA software, it would be extremely difficult if not impossible to gather sufficient data for consistently well-informed decisions