HMI screen layout principles in SCADA systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main goal of an HMI screen layout?

To present information clearly and simply so operators can quickly understand and control the system.

beginner

Why should important controls and indicators be placed prominently on an HMI screen?

Because placing key elements where they are easy to see helps operators react faster and reduces errors.

intermediate

What does consistency in HMI screen design mean?

Using similar colors, fonts, and layouts across screens so operators feel familiar and avoid confusion.

intermediate

How does grouping related information on an HMI screen help operators?

It makes it easier to find and understand related data quickly, like grouping all temperature controls together.

beginner

What role does color play in HMI screen layout?

Colors highlight status and alerts, guide attention, and improve readability when used thoughtfully and consistently.

What is the best place to put critical alarms on an HMI screen?

A Hidden in a menu to avoid distraction

B Mixed with unrelated information

C At the bottom corner of the screen

D In a prominent, easy-to-see area near the top or center

Critical alarms must be visible immediately to allow quick operator response.

Which principle helps operators quickly find related controls on an HMI screen?

A Random placement of controls

B Using many different fonts

C Grouping related information

D Using only black and white colors

Grouping related items together improves clarity and speed of use.

Why is consistency important in HMI screen design?

A It makes the system look more colorful

B It helps operators learn and use the system faster

C It allows mixing different styles freely

D It reduces the number of screens

Consistent design reduces confusion and speeds operator understanding.

What is a good use of color on an HMI screen?

A To highlight alarms and status changes

B To decorate the screen with random colors

C To make all text red

D To hide important information

Color should guide attention and indicate status clearly.

Which layout principle helps reduce operator errors?

A Clear and simple presentation of information

B Using as many controls as possible on one screen

C Hiding important controls in submenus

D Using flashing colors everywhere

Simple layouts help operators focus and avoid mistakes.

Explain the key principles to follow when designing an HMI screen layout.

Think about how to make the screen easy and quick to understand for operators.

Describe how color and grouping improve operator interaction with an HMI screen.

Consider how visual cues help in real-life situations.

Practice

1. What is the main purpose of grouping related items together on an HMI screen?

easy

A. To make the screen look more complex

B. To make the screen easier to understand and use

C. To increase the number of buttons

D. To use more colors on the screen

Solution

1. Step 1: Understand grouping concept

   Grouping related items helps users find information quickly and reduces confusion.

2. Step 2: Consider user experience

   A clear layout improves safety and efficiency by making controls intuitive.

3. Final Answer:

   To make the screen easier to understand and use -> Option B

4. Quick Check:

   Grouping = Easier use [OK]

Hint: Group related controls for clarity and ease [OK]

Common Mistakes:

• Thinking more colors always improve clarity
• Adding too many buttons without grouping
• Ignoring user navigation needs

2. Which of the following is the correct way to label buttons on an HMI screen?

easy

A. Use clear, descriptive text like 'Start Pump 1'

B. Use vague terms like 'Start' without context

C. Use only icons without any text

D. Use random colors without meaning

Solution

1. Step 1: Identify labeling best practice

   Clear, descriptive labels help users understand button functions immediately.

2. Step 2: Avoid vague or confusing labels

   Labels like 'Start Pump 1' are better than generic or icon-only labels for clarity.

3. Final Answer:

   Use clear, descriptive text like 'Start Pump 1' -> Option A

4. Quick Check:

   Clear labels = Better understanding [OK]

Hint: Use clear text labels, not vague or icon-only [OK]

Common Mistakes:

• Using unclear or generic button names
• Relying only on icons without text
• Ignoring color meaning in labels

3. Consider this HMI screen layout code snippet:

screen = {
  'title': 'Main Panel',
  'buttons': [
    {'label': 'Start', 'color': 'green'},
    {'label': 'Stop', 'color': 'red'},
    {'label': 'Reset', 'color': 'yellow'}
  ]
}

What is the main issue with this layout?

medium

A. Button colors do not match their typical meanings

B. Button labels are too descriptive

C. The screen title is missing

D. There are too many buttons

Solution

1. Step 1: Analyze button colors and meanings

   Green for 'Start' matches (go/action), red for 'Stop' matches (danger/stop), but yellow for 'Reset' does not--yellow typically means caution/warning, not reset.

2. Step 2: Confirm other options

   Labels are simple (not too descriptive), title present, few buttons--issue is color mismatch.

3. Final Answer:

   Button colors do not match their typical meanings -> Option A

4. Quick Check:

   Colors should match meaning [OK]

Hint: Match button colors to their common meanings [OK]

Common Mistakes:

• Ignoring color conventions
• Assuming more buttons are always bad
• Overlooking screen title presence

4. You notice an HMI screen is cluttered with many controls and colors. What is the best way to fix this?

medium

A. Remove all labels to save space

B. Add more colors to differentiate controls

C. Group related controls and reduce color usage

D. Increase screen brightness

Solution

1. Step 1: Identify clutter causes

   Too many controls and colors make the screen confusing and hard to use.

2. Step 2: Apply layout principles

   Grouping related controls and limiting colors improves clarity and usability.

3. Final Answer:

   Group related controls and reduce color usage -> Option C

4. Quick Check:

   Less clutter = Better usability [OK]

Hint: Group controls and limit colors to reduce clutter [OK]

Common Mistakes:

• Adding more colors increases confusion
• Removing labels reduces clarity
• Changing brightness does not fix layout

5. You need to design an HMI screen for a complex system with many controls. Which approach best follows good layout principles?

hard

A. Use flashing colors to attract attention to all controls

B. Put all controls on one screen with random colors for each

C. Use only icons without labels to save space

D. Create multiple screens grouping related controls and use consistent colors

Solution

1. Step 1: Understand complexity management

   Complex systems require breaking down controls into manageable groups to avoid overwhelming users.

2. Step 2: Apply layout best practices

   Using multiple screens with grouped controls and consistent colors improves navigation and safety.

3. Step 3: Avoid poor practices

   Random colors, icon-only labels, and flashing colors cause confusion and reduce usability.

4. Final Answer:

   Create multiple screens grouping related controls and use consistent colors -> Option D

5. Quick Check:

   Group + consistent colors = Best design [OK]

Hint: Use multiple grouped screens with consistent colors [OK]

Common Mistakes:

• Trying to fit all controls on one screen
• Using random or flashing colors
• Relying only on icons without text