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Questions and Answers
Which protocol is based on the client-server principle?
What makes IEC 61850 more vulnerable to reconnaissance in cyber attacks?
What type of functions is MMS typically used for?
How are variables represented in IEC 61850 compared to Modbus and DNP3?
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In what way is Manufacturing Messaging Specification (MMS) different from routable GOOSE messages?
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What is the main purpose of the IEC 61850 standard?
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What is the main advantage of using digitized Sample Values (SV) in IEC 61850?
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What is the key difference between SV and GOOSE protocols in IEC 61850?
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Why are GOOSE messages required to have low latency in IEC 61850?
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How does the IEC 61850-90-2 protocol address the limitation of SV and GOOSE protocols being unable to be routed outside the substation?
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Study Notes
Client-Server Protocols
- The client-server principle is foundational in various protocols, facilitating interaction between devices in a network.
Cybersecurity Vulnerabilities in IEC 61850
- IEC 61850 is more vulnerable to reconnaissance attacks due to its use of standard protocols, which makes it easier for attackers to scan and discover device functionalities.
Functions of MMS
- MMS (Manufacturing Messaging Specification) is primarily used for control and monitoring functions, enabling communication of device status and their operational capabilities.
Variable Representation in IEC 61850
- In IEC 61850, variables are represented using abstract data models, allowing greater flexibility and interoperability compared to more rigid structures in Modbus and DNP3.
MMS vs. Routable GOOSE Messages
- MMS operates on a request-response basis for data exchange, while routable GOOSE messages are designed for quick, lightweight communication without the need for a response.
Purpose of IEC 61850 Standard
- The main aim of the IEC 61850 standard is to enhance interoperability among devices in electrical substations, facilitating efficient data exchange and systems integration.
Advantages of Digitized Sample Values (SV)
- Digitized Sample Values provide high-resolution data transmission, allowing precise and timely measurement of electrical variables, which improves system performance and monitoring capabilities.
Key Differences Between SV and GOOSE Protocols
- SV protocols stream continuous data such as analog measurements, while GOOSE messages are initiated by events, designed for rapid transmission of digital signals and alarms.
Low Latency Requirements for GOOSE Messages
- GOOSE messages are required to have low latency to ensure real-time response in protective relaying and control applications, minimizing response times in critical scenarios.
IEC 61850-90-2 Protocol Enhancements
- IEC 61850-90-2 addresses routing issues by enabling SV and GOOSE messages to be directed beyond substations, thus supporting wider network communication without compromising performance.
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Description
Test your knowledge on the IEC 61850 standard for SCADA communication which brings open, interoperable systems and flexible architectures to the substation automation domain. Explore the standardized function objects and protocols based on Ethernet used in this standard.
