Supervision systems
Introduction
SCADA, acronym for Supervisory Control And Data Acquisition (Supervisory Control and Data Acquisition) is a concept used to create software for computers that allows remote control and supervision of industrial processes. It provides real-time feedback with field devices (sensors and actuators), and controls the process automatically. It provides all the information that is generated in the production process (supervision, quality control, production control, data storage, etc.) and allows its management and intervention.
In control theory, feedback is a process by which a certain proportion of a system's output signal is redirected back to the input. This is often used to control the dynamic behavior of the system. Examples of feedback can be found in most complex systems, such as engineering, architecture, economics, sociology and biology.
Open and closed loop
There are mainly two types of systems: open loop or non-feedback systems and closed loop or feedback systems. Closed loop systems work in such a way that they make the output return to the beginning so that the difference with a reference value is analyzed and in a second option the output is adjusted, until the error is zero or below a previously defined threshold. Any system that aims to control a quantity such as temperature, speed, pressure, flow, force, position, among other variables, are normally closed loop. Open loop systems do not compare the controlled variable with a reference input. Each input setting determines a fixed operating position in the control elements (e.g. with timers).
Thus, feedback is a mechanism or process whose signal moves within a system and returns to the beginning of it as in a loop, which is called a "feedback loop." In a control system (which has inputs and outputs), part of the output signal returns back to the system as part of its input; This is called "feedback" or feedback.
Feedback includes all those application solutions that refer to the capture of information from a process or plant, not necessarily industrial, so that, with this information, it is possible to carry out a series of analyzes or studies with which valuable indicators can be obtained that allow feedback on an operator or on the process itself, such as: