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CAS Automation Specialist Network Communications & Protocols Flashcards

7 cards from real CAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In a DeviceNet network, what is the maximum number of nodes allowed on a single network segment?

    Answer: 64

    DeviceNet supports a maximum of 64 nodes (MAC IDs 0–63) on a single network segment.

  2. Which layer of the OSI model does an IP router primarily operate at?

    Answer: Network (Layer 3)

    Routers operate at OSI Layer 3 (Network layer), using IP addresses to determine the best path for forwarding packets between networks.

  3. What does the term 'determinism' mean in the context of industrial communication protocols?

    Answer: Data delivery occurs within a guaranteed, predictable time frame

    Determinism in industrial networks means that message delivery times are bounded and predictable, which is critical for real-time control applications.

  4. AS-Interface (AS-i) is primarily designed for connecting which type of devices at the lowest level of the automation hierarchy?

    Answer: Binary sensors and actuators

    AS-Interface is a low-cost, simple two-wire fieldbus specifically designed to connect binary (on/off) sensors and actuators at the field level.

  5. Which wireless protocol standard, operating in the 2.4 GHz ISM band, is most commonly used for industrial wireless sensor networks (WirelessHART)?

    Answer: IEEE 802.15.4

    WirelessHART is built on the IEEE 802.15.4 physical and data link layer standard, which provides low-power, low-data-rate mesh networking in the 2.4 GHz band.

  6. In Modbus TCP/IP, what is the default port number used for communication?

    Answer: 502

    Modbus TCP/IP uses TCP port 502 as the well-known port for all Modbus client-server transactions over Ethernet.

  7. What is the purpose of a 'terminating resistor' at each end of a PROFIBUS or RS-485 network?

    Answer: To absorb signal reflections and prevent data corruption

    Terminating resistors match the cable's characteristic impedance, absorbing signal energy at the cable ends to prevent reflections that would corrupt data.