Modbus protocol for SCADA in SCADA systems - Mini Project: Build & Apply

Modbus Protocol Setup for SCADA System

📖 Scenario: You are working as a technician setting up a SCADA system to monitor and control industrial devices. The devices communicate using the Modbus protocol. Your task is to create a simple Modbus data structure, configure a polling interval, read data from the devices, and display the results.

🎯 Goal: Build a basic Modbus communication setup for a SCADA system that stores device registers, sets a polling interval, reads register values, and outputs the read data.

📋 What You'll Learn

Create a dictionary named modbus_registers with specific device register addresses and values

Add a variable polling_interval to set the time between data reads

Use a for loop to read values from modbus_registers

Print the read register addresses and their values

💡 Why This Matters

🌍 Real World

SCADA systems use Modbus protocol to communicate with industrial devices like sensors and controllers. Setting up registers and polling intervals is essential for monitoring and controlling these devices.

💼 Career

Understanding Modbus data structures and polling helps technicians and engineers configure SCADA systems for reliable industrial automation and monitoring.

1

Create Modbus Registers Data Structure

Create a dictionary called modbus_registers with these exact entries: 1001: 45, 1002: 78, 1003: 102

SCADA systems

# Create the modbus_registers dictionary with device register addresses and values
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with keys as register addresses and values as register data.

2

Set Polling Interval Configuration

Add a variable called polling_interval and set it to 5 seconds to define how often the SCADA system reads data.

SCADA systems

modbus_registers = {1001: 45, 1002: 78, 1003: 102}
# Set polling_interval to 5 seconds
# Your code here

Need a hint?

Simply assign the number 5 to the variable polling_interval.

3

Read Data from Modbus Registers

Use a for loop with variables address and value to iterate over modbus_registers.items() and prepare to read each register's value.

SCADA systems

modbus_registers = {1001: 45, 1002: 78, 1003: 102}
polling_interval = 5
# Loop through modbus_registers to read each register
# Your code here

Need a hint?

Use for address, value in modbus_registers.items(): to loop through the dictionary.

4

Display Read Register Values

Inside the for loop, write a print statement to display the text "Register {address} has value {value}" using an f-string.

SCADA systems

modbus_registers = {1001: 45, 1002: 78, 1003: 102}
polling_interval = 5
for address, value in modbus_registers.items():
    # Print register address and value
    # Your code here

Need a hint?

Use print(f"Register {address} has value {value}") inside the loop to show each register's data.