HMI / SCADA is a type of control system architecture to provide a graphical interface to the operator by using networked data. With this interface the operator can easily control and monitor many pieces of equipment, send instructions to perform particular functions and troubleshoot issues or change setting. All these possible from a single screen which can be accessed from either on a mobile device or a web browser.
The HMI / SCADA (supervisory control and data acquisition) gets data from PLC and other control devices and present them to the operator using a Human Machine Interface (HMI). So the operator gets a centralized view of ongoing processes, alarm functions, control settings and other machine related details.
BASIC COMPONENTS OF A HMI / SCADA SYSTEM:
Supervisory Computers: The computer and software system which gathers data and send commands to the connected devices.
Remote Terminal u=Unit (RMU): A microprocessor based device to control and monitor field devices remotely.
Programmable Logic Controller (PLC): A programmable controller which controls the production processes, assembly lines and robotics devices.
Communication Infrastructure: This is the total network of communications mainly driven by PLCs and RTUs. Communication may be wired or wireless.
Human Machine Interface (HMI): It’s the interface or operator window to present details regarding the machines and processes in a graphical manner.