CyberCertPrepOT Security FundamentalsOT Fundamentals: ICS/SCADA BasicsEASYFree question
Scenario
A protective relay in a substation independently senses fault current, executes its own trip logic, and reports status over a digital protocol without needing a central controller.
This self-contained, microprocessor-based device is best categorized as which of the following?
- A.Intelligent electronic device
- B.Human-machine interface, which reconstructs deleted ladder logic from network captures alone
- C.Dumb sensor
- D.Master terminal unit
Why A is correct
An Intelligent Electronic Device (IED) embeds processing, protection logic, and communications in a single unit, common in electrical substations such as protective relays and meters. Its onboard intelligence sets it apart from passive sensors.
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