HMI stands for Human Machine Interface. This is the interface between the operator and the controller.
The HMI is the controller operating panel. The panel comprises a numeric keypad and a LCD screen that displays text.
The keypad is used to input data into the application, such as Timer values.
The PLC's Display screen can show operator messages, variable information from the program and system information.
HMI messages are created in the Display Editor.
Variable information fields are created in the Variable Editor.
HMI applications are featured in several sample applications, such as the applications ' Display Jumps from Ladder', 'Names from List Var', 'Password', 'Special characters on List', 'Display of Events', and '5 Vars on Display'. These applications may be found by selecting Sample U90 Projects from the Help Menu.