Monolithic SCADA architecture in SCADA systems - Mini Project: Build & Apply

Monolithic SCADA Architecture Setup

📖 Scenario: You are working in a factory that uses a SCADA system to monitor and control its machines. The factory currently uses a monolithic SCADA architecture where all components are tightly integrated into one system.Your task is to simulate the basic setup of this monolithic SCADA system using simple data structures to represent sensors and control commands.

🎯 Goal: Build a simple monolithic SCADA system model by creating a data structure for sensors, adding configuration for alert thresholds, processing sensor data to check for alerts, and finally displaying the alert status.

📋 What You'll Learn

Create a dictionary to hold sensor names and their current readings

Add a configuration variable for the alert threshold

Write a loop to check each sensor reading against the threshold and store alert status

Print the final alert status dictionary

💡 Why This Matters

🌍 Real World

Factories and industrial plants use monolithic SCADA systems to monitor machine conditions and trigger alerts when values go beyond safe limits.

💼 Career

Understanding how to model and check sensor data is a key skill for DevOps engineers working with industrial automation and monitoring systems.

1

Create sensor data dictionary

Create a dictionary called sensors with these exact entries: 'Temperature': 75, 'Pressure': 30, 'Humidity': 45

SCADA systems

# Create the sensors dictionary with exact sensor readings
# Your code here

Hint

Use curly braces to create a dictionary and separate each sensor with a comma.

2

Add alert threshold configuration

Create a variable called alert_threshold and set it to 50

SCADA systems

sensors = {'Temperature': 75, 'Pressure': 30, 'Humidity': 45}
# Set the alert threshold value
# Your code here

Hint

Just assign the number 50 to the variable alert_threshold.

3

Check sensors against threshold

Create an empty dictionary called alerts. Use a for loop with variables sensor and value to iterate over sensors.items(). Inside the loop, set alerts[sensor] to True if value is greater than alert_threshold, otherwise False

SCADA systems

sensors = {'Temperature': 75, 'Pressure': 30, 'Humidity': 45}
alert_threshold = 50
# Create alerts dictionary and check each sensor
# Your code here

Hint

Use a dictionary to store alert status and a for loop to check each sensor value.

4

Display alert status

Write a print statement to display the alerts dictionary

SCADA systems

sensors = {'Temperature': 75, 'Pressure': 30, 'Humidity': 45}
alert_threshold = 50
alerts = {}
for sensor, value in sensors.items():
    alerts[sensor] = value > alert_threshold
# Print the alerts dictionary
# Your code here

Hint

Use print(alerts) to show the alert status.

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