OPC UA modern architecture in SCADA systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the OPC UA server endpoint URL.

SCADA systems

server.set_endpoint("opc.tcp://[1]:4840")

Drag options to blanks, or click blank then click option'

Aexample.com

B192.168.1.100

Clocalhost

D0.0.0.0

Attempts:

3 left

💡 Hint

Common Mistakes

Using a domain name instead of an IP address

Using 'localhost' when remote access is needed

The server endpoint URL must include the IP address where the OPC UA server listens. Here, '192.168.1.100' is the correct local network IP.

2fill in blank

medium

Complete the code to add a variable node to the OPC UA address space.

SCADA systems

myvar = server.nodes.objects.add_variable(2, "MyVariable", [1])

Drag options to blanks, or click blank then click option'

A42

B"Hello"

CTrue

D3.14

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a number

Using a boolean when a number is expected

The variable node value is set to 42, a simple integer example for OPC UA variable data.

3fill in blank

hard

Fix the error in the code to start the OPC UA server.

SCADA systems

server.[1]()

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Aopen

Brun

Claunch

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' or 'launch' which are not valid methods

Using 'open' which is unrelated

The correct method to start the OPC UA server is 'start()'. Other options are invalid method names.

4fill in blank

hard

Fill both blanks to create a subscription and add a monitored item.

SCADA systems

subscription = server.create_subscription([1], handler)
handle = subscription.[2](myvar)

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A1000

Bsubscribe_data_change

Ccreate_monitored_item

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method names

Using incorrect interval values

The subscription interval is set to 1000 ms, and the method to add a monitored item is 'create_monitored_item'.

5fill in blank

hard

Fill all three blanks to define a secure OPC UA client connection.

SCADA systems

client = Client("opc.tcp://[1]:4840")
client.[2] = "Basic256Sha256"
client.[3]()

Drag options to blanks, or click blank then click option'

A192.168.10.10

Bsecurity_policy

Cconnect

Dsecurity_mode

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong property names

Using incorrect IP addresses

Calling wrong methods to connect

The client connects to IP '192.168.10.10'. The security policy is set with 'security_policy', and the connection is started with 'connect()'.