IIoT and Industrial Networking Flashcards
7 cards from real SACA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 IIoT and Industrial Networking flashcards as text
Which IIoT edge computing pattern processes sensor data locally before forwarding aggregated results to the cloud?
Answer: Fog computing
Fog computing places processing nodes at the network edge, reducing latency and bandwidth to the cloud by filtering and aggregating raw sensor data locally.
In industrial Ethernet, what is the primary purpose of PROFINET's IRT (Isochronous Real-Time) mode?
Answer: Achieving cycle times under 1 ms with deterministic jitter
IRT mode uses scheduled, synchronized communication slots to deliver sub-millisecond cycle times with bounded jitter, required for motion control applications.
A plant engineer needs to transmit process variable data from a field instrument over a 4–20 mA loop while also sending digital configuration data. Which protocol accomplishes this?
Answer: HART (Highway Addressable Remote Transducer)
HART superimposes a digital FSK signal onto the existing 4–20 mA analog loop, enabling bidirectional digital communication without replacing legacy wiring.
Which OPC UA security mechanism ensures that a client and server mutually authenticate each other before exchanging industrial data?
Answer: X.509 certificate exchange
OPC UA uses X.509 digital certificates for mutual authentication, ensuring both endpoints are trusted before an encrypted session is established.
What is the significance of the Purdue Model's Level 3 in an IIoT architecture?
Answer: It contains manufacturing operations and MES systems
Level 3 of the Purdue Model encompasses Manufacturing Operations Management, including MES, historians, and batch management systems that coordinate production.
An IIoT gateway must translate Modbus RTU data from legacy PLCs into MQTT messages for a cloud broker. Which component in the gateway performs this translation?
Answer: Protocol converter / southbound adapter
A southbound adapter (protocol converter) reads Modbus RTU frames and maps them to MQTT topics and payloads understood by the northbound cloud broker.
Which wireless technology is best suited for low-power IIoT sensors that must transmit small packets over several kilometers in an outdoor industrial campus?
Answer: LoRaWAN
LoRaWAN is specifically designed for low-power, wide-area sensor networks, offering kilometer-range coverage with minimal battery consumption for infrequent small-payload transmissions.