HMI screen layout principles in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding HMI Screen Layout Focus

Which principle best describes the main goal when designing an HMI screen layout?

A Use as many colors and fonts as possible to attract attention

B Maximize the number of controls on one screen to reduce navigation

C Organize information clearly to support quick operator decisions

D Place all alarms and controls randomly to test operator alertness

💡 Hint

Think about what helps operators work efficiently and safely.

The main goal of HMI screen layout is to organize information clearly so operators can make quick and accurate decisions. Overcrowding or random placement can confuse users.

✅ Best Practice

intermediate

Best Practice for Alarm Display on HMI Screens

What is the best practice for displaying alarms on an HMI screen to ensure operator awareness?

A Group alarms by priority and use consistent colors for severity

B Display only the most recent alarm and hide older ones

C Show all alarms in one list without priority or grouping

D Use flashing text for all alarms regardless of importance

💡 Hint

Consider how to help operators quickly identify critical issues.

Grouping alarms by priority and using consistent colors helps operators quickly identify and respond to the most important issues.

❓ Configuration

advanced

Configuring Navigation Buttons for HMI Screens

You want to configure navigation buttons on an HMI screen to improve usability. Which configuration is best?

SCADA systems

Button1: Go to Main Screen
Button2: Go to Alarm Screen
Button3: Go to Settings
Button4: Go to Reports

A Scatter navigation buttons randomly around the screen edges

B Place navigation buttons at the bottom center of the screen with clear labels

C Hide navigation buttons and use keyboard shortcuts only

D Place navigation buttons in the top left corner stacked vertically without labels

💡 Hint

Think about where users expect to find navigation controls.

Placing navigation buttons at the bottom center with clear labels is a common and user-friendly layout that supports easy access and understanding.

❓ Troubleshoot

advanced

Troubleshooting Poor HMI Screen Readability

An operator reports that the HMI screen is hard to read due to color choices. What is the most likely cause?

A Using consistent color coding for alarms

B Using only black and white colors

C Using large fonts and simple icons

D Using low contrast colors for text and background

💡 Hint

Think about what affects visibility and clarity on screens.

Low contrast between text and background colors makes it difficult to read information on the screen, reducing usability.

🔀 Workflow

expert

Optimizing HMI Screen Workflow for Operator Efficiency

Which workflow design best supports efficient operator interaction on an HMI system?

A Design screens with a logical flow from overview to detailed controls, minimizing clicks

B Design all controls on one screen to avoid switching screens

C Design screens with random control placement to keep operators alert

D Design screens that require multiple confirmations for every action

💡 Hint

Consider how operators move through tasks smoothly.

A logical flow from overview to detailed controls reduces operator effort and errors by minimizing unnecessary navigation and clicks.