The lack of a standard on what colors to use on HMI screens is a serious problem, because the most of HMI graphic pages depended on the personal taste of the engineer that realized it. It’s not the first time that i see purple buttons, blue leds and green backgrounds. ...

7 segment displays is one of the best way to show present values in industrial programs. Operators are used to see numbers and values with  7 segment led characters, and if the operator feels comfortable with what he sees, he works better and in a more correct way. So it’s ...