OPC UA modern architecture in SCADA systems - Mini Project: Build & Apply

OPC UA Modern Architecture Setup

📖 Scenario: You are working in a factory automation team. Your task is to set up a simple OPC UA server configuration that represents modern OPC UA architecture. This will help machines and software communicate securely and efficiently.

🎯 Goal: Build a basic OPC UA server configuration with nodes representing devices and their data points. Then add a security policy setting and finally print the server's configuration summary.

📋 What You'll Learn

Create a dictionary called opcua_server with device nodes and their data points

Add a security_policy key with the value Basic256Sha256

Use a loop to collect all device names into a list called device_names

Print the device_names list as the final output

💡 Why This Matters

🌍 Real World

OPC UA is widely used in industrial automation to enable secure and standardized communication between machines and control systems.

💼 Career

Understanding OPC UA architecture helps in configuring SCADA systems and integrating industrial devices for monitoring and control.

1

Create OPC UA server nodes

Create a dictionary called opcua_server with these exact entries: 'Device1': {'Temperature': 22.5, 'Pressure': 101.3} and 'Device2': {'Temperature': 23.0, 'Pressure': 100.8}.

SCADA systems

# Create the opcua_server dictionary with Device1 and Device2 nodes
# Your code here

Need a hint?

Use a dictionary with keys 'Device1' and 'Device2'. Each key maps to another dictionary with 'Temperature' and 'Pressure' keys.

2

Add security policy configuration

Add a key called security_policy to the opcua_server dictionary with the value 'Basic256Sha256'.

SCADA systems

opcua_server = {
    'Device1': {'Temperature': 22.5, 'Pressure': 101.3},
    'Device2': {'Temperature': 23.0, 'Pressure': 100.8}
}
# Add security_policy key with value 'Basic256Sha256' to opcua_server
# Your code here

Need a hint?

Use opcua_server['security_policy'] = 'Basic256Sha256' or add it directly in the dictionary.

3

Collect device names

Use a for loop with the variable device to iterate over opcua_server keys and collect only device names (exclude 'security_policy') into a list called device_names.

SCADA systems

opcua_server = {
    'Device1': {'Temperature': 22.5, 'Pressure': 101.3},
    'Device2': {'Temperature': 23.0, 'Pressure': 100.8},
    'security_policy': 'Basic256Sha256'
}
# Create an empty list device_names
# Use a for loop with variable device to iterate over opcua_server keys
# Add device to device_names only if device is not 'security_policy'
# Your code here

Need a hint?

Initialize device_names as an empty list. Loop over opcua_server keys. Use an if to skip 'security_policy'. Append valid devices to the list.

4

Print device names

Write a print statement to display the device_names list.

SCADA systems

opcua_server = {
    'Device1': {'Temperature': 22.5, 'Pressure': 101.3},
    'Device2': {'Temperature': 23.0, 'Pressure': 100.8},
    'security_policy': 'Basic256Sha256'
}
device_names = []
for device in opcua_server:
    if device != 'security_policy':
        device_names.append(device)
# Print the device_names list
# Your code here

Need a hint?

Use print(device_names) to show the list of device names.