Master station and HMI in SCADA systems - Mini Project: Build & Apply

Master Station and HMI Setup in SCADA Systems

📖 Scenario: You are working in a factory automation team. Your task is to set up a simple SCADA system with a Master Station and an HMI (Human-Machine Interface) to monitor and control a small process.The Master Station collects data from sensors and sends commands. The HMI displays this data and allows operators to send commands back.

🎯 Goal: Build a basic SCADA system simulation where the Master Station holds sensor data, the HMI reads this data, and the operator can send a command to change a device state.

📋 What You'll Learn

Create a dictionary called master_station with sensor data

Add a variable called command to hold operator commands

Write a function update_device_state that changes device state based on command

Print the updated device state from the HMI

💡 Why This Matters

🌍 Real World

SCADA systems are used in factories, power plants, and water treatment facilities to monitor and control equipment remotely.

💼 Career

Understanding how Master Stations and HMIs work is essential for roles in industrial automation, control engineering, and system maintenance.

1

Create Master Station Data

Create a dictionary called master_station with these exact entries: 'temperature': 75, 'pressure': 30, and 'device_state': 'OFF'.

SCADA systems

# Your code here

Need a hint?

Think of master_station as a control panel holding sensor readings and device status.

2

Add Operator Command Variable

Add a variable called command and set it to the string 'TURN_ON' to represent an operator's command.

SCADA systems

master_station = {'temperature': 75, 'pressure': 30, 'device_state': 'OFF'}
# Your code here

Need a hint?

The command variable simulates what the operator wants to do with the device.

3

Write Function to Update Device State

Write a function called update_device_state that takes master_station and command as parameters. If command is 'TURN_ON', set master_station['device_state'] to 'ON'. If command is 'TURN_OFF', set it to 'OFF'. Otherwise, leave it unchanged.

SCADA systems

master_station = {'temperature': 75, 'pressure': 30, 'device_state': 'OFF'}
command = 'TURN_ON'
# Your code here

Need a hint?

This function simulates how the Master Station changes device state based on operator commands.

4

Display Updated Device State on HMI

Call the function update_device_state with master_station and command. Then print the string 'Device state is: ' followed by the value of master_station['device_state'].

SCADA systems

master_station = {'temperature': 75, 'pressure': 30, 'device_state': 'OFF'}
command = 'TURN_ON'

def update_device_state(master_station, command):
    if command == 'TURN_ON':
        master_station['device_state'] = 'ON'
    elif command == 'TURN_OFF':
        master_station['device_state'] = 'OFF'

# Your code here

Need a hint?

This simulates the HMI showing the current device state after the Master Station updates it.