IEC 60870-5-104 Protocol in SCADA: What It Is and How It Works

The IEC 60870-5-104 protocol is a communication standard used in SCADA systems to exchange data over TCP/IP networks. It enables remote control and monitoring of electrical equipment by defining how messages are formatted and transmitted between devices.

How It Works

Imagine you want to control and monitor electrical devices like transformers or circuit breakers from a distance. The IEC 60870-5-104 protocol acts like a common language that both the control center and the devices understand. It uses the internet protocol (TCP/IP) to send and receive messages reliably.

Think of it as sending letters with a clear format and rules so the receiver knows exactly what each part means. This protocol defines how to package commands and data, how to check for errors, and how to keep the connection alive. It helps SCADA systems communicate quickly and safely over networks.

Example

This example shows a simple Python script using the pyiec104 library to connect to a device using IEC 60870-5-104 and read a data point.

python

from pyiec104 import Client

# Connect to the SCADA device at IP 192.168.1.100, port 2404
client = Client('192.168.1.100', 2404)
client.connect()

# Read a single data point with address 100
value = client.read_single_point(100)
print(f'Read value: {value}')

client.disconnect()

Output

Read value: True

When to Use

Use IEC 60870-5-104 when you need to remotely monitor and control electrical substations or power grids over IP networks. It is ideal for utilities and industries that require real-time data exchange and control commands.

For example, electric companies use it to supervise transformers, circuit breakers, and other equipment from a central control room. It helps improve safety, efficiency, and quick response to faults or changes in the power system.

Key Points

• IEC 60870-5-104 is a standard protocol for SCADA communication over TCP/IP.
• It enables real-time control and monitoring of electrical equipment remotely.
• Messages follow a strict format for reliability and error checking.
• Widely used in power utilities and industrial automation.

Key Takeaways

IEC 60870-5-104 is a TCP/IP-based protocol for SCADA systems to communicate with electrical devices.

It standardizes message formats for reliable remote control and monitoring.

Commonly used in power grids and substations for real-time data exchange.

Supports safe and efficient management of electrical infrastructure.