HMI Standards
Human-Machine Interface (HMI) standards emphasize the effective use of color to ensure clarity and accessibility for all users, including those with color vision deficiencies.
Standard Color Conventions in HMI:
- Red: Indicates emergency or hazardous conditions.
- Yellow: Signals abnormal conditions.
- Green: Denotes safe or normal operations.
- Blue: Requires operator intervention.
These conventions are outlined in standards such as EN60204-1, which covers lamp colors and other indicators in industrial settings. CONTROL.COM
The problem is mostly Red and Green.
Color should not be the only indicator
Do not use color as the only means to convey information. For instance, instead of just changing a value's color to red to indicate an alarm, incorporate additional cues like flashing borders or symbols. DATAPARC.COM Combine Colors with Descriptive Text and Shapes:
Pair colors with descriptive text or unique shapes to ensure information is accessible to all users. For example, using an alarm indicator that displays a colored shape accompanied by descriptive text can effectively communicate issues. DOCS.INDUCTIVEAUTOMATION.COM
High-Contrast Color Combinations
Opt for high-contrast color pairs, such as black and yellow, instead of red and green, to enhance visibility for color-blind users.