HMI-Human Machine Interface is a user interface or dashboard that connects person to a machine, system or device. HMIs are used an operator's means to interact with PLC's RTU's and IED's.
Common features of HMI:
A keyboard or mouse that allows the user to input information
A power supply that provides power to the system
One or more speakers that output sound
A display screen that shows information to the user
Uses:
To optimize an industrial process by centralizing or digitizing information for viewers.
Alarms and warnings
Reliable messaging
Improved communication