Monolithic SCADA architecture in SCADA systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Monolithic SCADA architecture?

It is a single, large system where all SCADA functions like data collection, processing, and control are combined into one unit.

beginner

Name one advantage of Monolithic SCADA architecture.

It is simple to design and deploy because everything is in one place.

beginner

What is a common drawback of Monolithic SCADA systems?

If one part fails, the whole system can stop working, making it less reliable.

intermediate

How does Monolithic SCADA architecture compare to distributed SCADA?

Monolithic SCADA has all functions in one system, while distributed SCADA splits functions across multiple systems for better flexibility.

intermediate

Why might a company still choose Monolithic SCADA architecture today?

Because it can be easier to manage for small systems and requires less complex networking.

What does Monolithic SCADA architecture combine into one system?

A Data collection, processing, and control

B Only data collection

C Only control functions

D Only data storage

Monolithic SCADA combines all main functions like data collection, processing, and control into a single system.

What is a risk of using Monolithic SCADA architecture?

A System failure affects entire operation

B Too many separate systems to manage

C Requires complex network setup

D Hard to deploy initially

If one part of a monolithic system fails, it can cause the whole system to stop working.

Which is a benefit of Monolithic SCADA architecture?

A Highly flexible and scalable

B Simple design and deployment

C Easy to isolate faults

D Supports cloud-based control

Monolithic SCADA systems are simpler to design and deploy because all functions are in one place.

Compared to distributed SCADA, Monolithic SCADA is:

A More complex to manage

B Split into many small systems

C Always cloud-based

D A single unified system

Monolithic SCADA is a single unified system, unlike distributed SCADA which splits functions.

When is Monolithic SCADA architecture often preferred?

A When cloud integration is required

B For very large, complex systems

C For small systems with simple needs

D When high fault tolerance is needed

Monolithic SCADA is often chosen for small systems because it is easier to manage.

Explain what Monolithic SCADA architecture is and list one advantage and one disadvantage.

Think about how all SCADA functions are combined in one system.

Compare Monolithic SCADA architecture with distributed SCADA architecture.

Consider how the system is organized and how failures affect it.

Practice

1. What is a key characteristic of a Monolithic SCADA architecture?

easy

A. It requires no hardware components

B. Functions are distributed across multiple independent systems

C. It uses cloud-based services for data processing

D. All functions are combined into a single system

Solution

1. Step 1: Understand the architecture type

   Monolithic SCADA means all control, monitoring, and data processing happen in one system.

2. Step 2: Compare options to definition

   Only All functions are combined into a single system describes combining all functions into one system, matching monolithic architecture.

3. Final Answer:

   All functions are combined into a single system -> Option D

4. Quick Check:

   Monolithic = Single combined system [OK]

Hint: Monolithic means one big system, not many parts [OK]

Common Mistakes:

• Confusing monolithic with distributed architecture
• Thinking it uses cloud services by default
• Assuming no hardware is needed

2. Which of the following is the correct way to describe a monolithic SCADA system's deployment?

easy

A. Multiple servers each handling different SCADA functions

B. A single server running all SCADA functions together

C. Cloud-based microservices for SCADA tasks

D. No server needed, only client devices

Solution

1. Step 1: Identify deployment style of monolithic SCADA

   Monolithic SCADA runs all functions on one server or system.

2. Step 2: Match options to deployment style

   A single server running all SCADA functions together correctly states a single server runs all functions together.

3. Final Answer:

   A single server running all SCADA functions together -> Option B

4. Quick Check:

   Monolithic = single server deployment [OK]

Hint: Monolithic means one server, not many [OK]

Common Mistakes:

• Choosing distributed or cloud options
• Thinking client devices replace servers
• Confusing microservices with monolithic

3. Given a monolithic SCADA system managing a small plant, what is the likely impact if the main server fails?

medium

A. Control switches automatically to backup servers

B. Only monitoring stops, control continues on other servers

C. The entire SCADA system stops working

D. No impact, system is cloud-based

Solution

1. Step 1: Understand monolithic system dependency

   Monolithic SCADA depends on one main server for all functions.

2. Step 2: Analyze failure impact

   If the main server fails, all SCADA functions stop because there is no distribution or backup.

3. Final Answer:

   The entire SCADA system stops working -> Option C

4. Quick Check:

   Single server failure = full system down [OK]

Hint: One server down means whole system down [OK]

Common Mistakes:

• Assuming partial function continues
• Thinking automatic failover exists
• Confusing cloud with monolithic

4. A monolithic SCADA system is slow and unresponsive. Which is the most likely cause?

medium

A. The single server is overloaded with all functions

B. Network cables are unplugged

C. Multiple servers are conflicting

D. Cloud service is down

Solution

1. Step 1: Identify performance bottleneck in monolithic SCADA

   All functions run on one server, so overload causes slowness.

2. Step 2: Evaluate options for cause

   The single server is overloaded with all functions correctly points to server overload as cause of slowness.

3. Final Answer:

   The single server is overloaded with all functions -> Option A

4. Quick Check:

   One server overload = slow system [OK]

Hint: One server handles all; overload slows system [OK]

Common Mistakes:

• Blaming network cables without checking server load
• Assuming multiple servers exist in monolithic
• Thinking cloud issues affect monolithic SCADA

5. You manage a small factory with a monolithic SCADA system. You want to add new sensors and control points. What is the best approach?

hard

A. Upgrade the single SCADA server hardware and software to handle more devices

B. Split the SCADA system into multiple independent servers immediately

C. Switch to a cloud-based SCADA system without testing

D. Ignore new devices to avoid complexity

Solution

1. Step 1: Consider monolithic system limits

   Monolithic SCADA can be scaled by upgrading the single server to handle more devices.

2. Step 2: Evaluate options for best fit

   Upgrade the single SCADA server hardware and software to handle more devices is practical for small plants; splitting or cloud migration may be complex or risky immediately.

3. Final Answer:

   Upgrade the single SCADA server hardware and software to handle more devices -> Option A

4. Quick Check:

   Scale monolithic by upgrading server [OK]

Hint: Scale monolithic by upgrading server first [OK]

Common Mistakes:

• Rushing to split system without need
• Switching to cloud without testing
• Ignoring growth needs