Practice Test Geeks(CCST) Certified Control Systems Technician Practice Test
← All CCST Flashcard Decks

CCST Communications & Networking in Control Systems Flashcards

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

Read the first 6 CCST Communications & Networking in Control Systems flashcards as text

  1. Which Foundation Fieldbus segment type operates at 31.25 kbit/s and is intrinsically safe for use in hazardous areas?

    Answer: FF H1

    Foundation Fieldbus H1 operates at 31.25 kbit/s and can be powered intrinsically safely, making it suitable for Zone 0/1 hazardous locations.

  2. In Modbus RTU communication, what is the function of the CRC (Cyclic Redundancy Check) appended to each message frame?

    Answer: Detecting transmission errors in the data frame

    The CRC in Modbus RTU is a 16-bit error-detection code that allows the receiver to identify corrupted data frames.

  3. What is the role of a Device Type Manager (DTM) in an FDT/DTM framework used in modern field device management?

    Answer: It provides a device-specific software component for configuration and diagnostics within an FDT frame application

    A DTM is a device-specific software plug-in that runs inside an FDT Frame application to provide full configuration, calibration, and diagnostic access to a field instrument.

  4. When configuring a Modbus TCP/IP connection, which default TCP port number is used?

    Answer: 502

    Modbus TCP/IP uses TCP port 502 as its standard registered port for communication between master and slave devices.

  5. Which industrial protocol is specifically designed for time-sensitive applications and uses IEEE 802.1AS for clock synchronization?

    Answer: PROFINET IRT

    PROFINET IRT (Isochronous Real-Time) uses IEEE 802.1AS Precision Time Protocol for sub-microsecond clock synchronization to meet strict motion control timing requirements.

  6. A technician observes excessive collisions on a legacy industrial Ethernet segment. What is the most likely cause?

    Answer: Devices operating in half-duplex mode on a shared hub

    Collisions occur in half-duplex shared Ethernet (hub-based) environments where only one device can transmit at a time, and simultaneous transmissions cause collisions.