IEC 61850 does not treat control operations as simple “write a value and hope it works.” Instead, it defines formal control models that describe how a command is issued, who is allowed to issue it, and how safety is guaranteed. These control models are one of the most important — and most misunderstood — parts of IEC 61850.… Read More »
DNP3 (Distributed Network Protocol) is widely used in power systems, water utilities, and industrial SCADA systems. One of its most misunderstood features is the event class system. Many engineers assume that Class 1, 2, and 3 represent fixed priorities defined by the protocol. In reality, DNP3 works differently. This article explains what DNP3 event classes really are, how… Read More »
IEC 60870-5-104 (IEC-104) is one of the most widely used telecontrol protocols in electrical power systems. It plays a central role in communication between substations, RTUs, and control centers, especially in transmission and distribution SCADA systems. IEC-104 is reliable, efficient, and well understood by utilities worldwide. However, when the protocol was originally designed, cybersecurity was not a primary… Read More »
Everything engineers need to know about Basic Types, Common Data Classes, and how they appear in GOOSE, Sampled Values, MMS, and SCL. IEC 61850 is much more than a communication protocol—it is a semantic language designed to describe protection, control, measurement, and automation inside modern substations. At the core of this language lies one essential concept: 👉 Every… Read More »
Modbus is a simple protocol, but the values inside registers can be displayed in many different ways. A single 16-bit register can represent: The challenge is that the Modbus protocol never tells you how to interpret the number. Only the device’s documentation explains the meaning. To decode Modbus data correctly, engineers must understand the different data type formats… Read More »
Modbus TCP/IP is one of the most widely adopted methods for connecting industrial devices over Ethernet networks. It is used in factories, power plants, water treatment facilities, building automation systems, and countless other fields where equipment must exchange information reliably. Even though modern automation protocols offer advanced features, Modbus TCP/IP remains extremely common because it is easy to… Read More »
Sampled Values (SV) are one of the core technologies behind modern IEC 61850 digital substations. They allow current and voltage measurements from CTs and VTs to be transmitted as digital Ethernet messages instead of analog signals over copper wires. If GOOSE replaces binary wiring, Sampled Values replace CT/VT analog wiring. This article explains how SV works, why it… Read More »
IEC 61850 has transformed how substations communicate. In the past, everything depended on copper wiring, physical contacts, and slow serial links. Today, digital substations use Ethernet-based messages that move information instantly between IEDs. Two of the fastest and most important IEC 61850 services are: Even though both use Ethernet multicast, they serve completely different purposes. GOOSE carries decisions… Read More »
GOOSE (Generic Object Oriented Substation Event) is one of the most important communication services defined in IEC 61850. It is used to exchange fast, event-driven messages between protection IEDs, bay controllers, and automation devices. GOOSE is designed to carry protection signals such as trips, interlocks, blockings, permissives, and alarms with very low latency and high reliability, replacing copper… Read More »
Data Sets are one of the most important concepts in IEC 61850. They define which values inside an IED are grouped together so the device can report them, log them, publish them over GOOSE, or return them in a single MMS read request. Anyone working with protection relays, SCADA integration, automation logic, or commissioning eventually deals with Data… Read More »