Ch. 6 Industrial Networks Test
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Questions and Answers

What is the definition of an industrial network?

  • A network with at least four devices connected in a commercial environment
  • A network with at least five devices connected in an industrial environment
  • A network with at least two devices connected in a commercial environment
  • A network with at least three devices connected in an industrial environment (correct)

    • What are the additional requirements for industrial networks, beyond those of commercial networks?

  • They must provide effective performance for resources used and predictable scheduling
  • They must offer predictable throughput and extremely low downtime (correct)
  • They must offer predictable throughput and predictable scheduling
  • They must have extreme low downtime and provide predictable scheduling

    • What is the term used to describe the functionality where network response times must fall within a specific window of time to avoid errors?

  • Stochasticity
  • Predictability
  • Determinism (correct)
  • Variability

    • Why must time-sensitive operations, such as computing a PID algorithm, provide a definitive window of time for data input?

    <p>To ensure real-time control and stability of the process operation</p> Signup and view all the answers

    What does 'five nines' refer to in the context of downtime requirements in modern industry?

    <p>Downtime must be less than 0.00001%</p> Signup and view all the answers

    Why do all designs for industrial networks involve compromises?

    <p>To meet key industrial requirements such as low downtime and others</p> Signup and view all the answers

    What is the purpose of launching into the discussion of selected industrial networks in the chapter?

    <p>To illustrate key principles through examples of selected industrial networks</p> Signup and view all the answers

    What term is used to describe the functionality where industrial requirements dictate that network response times must fall within a specific window of time?

    <p>&quot;Determinism&quot;</p> Signup and view all the answers

    In an industrial environment, what is the minimum number of devices required to form an industrial network?

    <p>Three devices</p> Signup and view all the answers

    What is the main purpose of an industrial network?

    <p>To connect devices through a shared media or distribution for functional communications in an industrial environment</p> Signup and view all the answers

    What is one way to achieve 99.999 percent of total system availability?

    <p>Using distributed control</p> Signup and view all the answers

    What does it mean for a system to be scalable from one to many?

    <p>The design remains efficient regardless of network size</p> Signup and view all the answers

    What is an essential characteristic of a well-designed industrial control system according to the text?

    <p>Operable by nonspecialists</p> Signup and view all the answers

    What advantage do distributed control systems (DCSs) offer over programmable logic controllers (PLCs)?

    <p>Peer-to-peer communications</p> Signup and view all the answers

    What is an evolution of the older standalone digital controller mentioned in the text?

    <p>Programmable automation controller (PAC)</p> Signup and view all the answers

    Which feature is associated with proprietary DCSs according to the passage?

    <p>Nice graphics and diagnostics</p> Signup and view all the answers

    What did the early DCS systems use to link all their components?

    <p>Vendor-proprietary LANs</p> Signup and view all the answers

    What is a characteristic of Allen-Bradley's Data Highway network?

    <p>Local area network for up to 255 nodes</p> Signup and view all the answers

    What is one essential aspect of industrial equipment according to the text?

    <p>'Industrially hardened' or enclosed in an industrial enclosure</p> Signup and view all the answers

    'Bumpless' redundancy and live configuration change capabilities are seen as essential in which industrial automation offerings?

    <p>'Bumpless' redundancy and live configuration change capabilities are essential in DCS-based offerings.</p> Signup and view all the answers

    What type of network is DeviceNet?

    <p>Low-level network for connecting simple industrial devices</p> Signup and view all the answers

    Which industrial network uses the Dynamic Host Configuration Protocol?

    <p>EtherNet/IP</p> Signup and view all the answers

    What kind of controllers provide advanced process control capabilities and have been accepted for industrial batch process automation?

    <p>Programmable automation controllers (PACs)</p> Signup and view all the answers

    What is the data rate provided by the HART protocol?

    <p>1200 bps</p> Signup and view all the answers

    What is the primary purpose of offering proprietary distributed control systems (DCSs)?

    <p>To perform continuous process control actions</p> Signup and view all the answers

    What differentiates PROFIBUS PA from PROFIBUS DP?

    <p>Physical media technology used</p> Signup and view all the answers

    Which industrial network uses the EIA-709 standard?

    <p>LonWorks</p> Signup and view all the answers

    What does FOUNDATION Fieldbus handle in two different modes?

    <p>Data in cyclic and acyclic modes</p> Signup and view all the answers

    What is the main purpose of HART instruments' advanced diagnostics?

    <p>Optimizing field device configuration</p> Signup and view all the answers

    What is LonWorks' major market according to the text?

    <p>Building automation</p> Signup and view all the answers

    What does EtherNet/IP use to allow devices to be added and removed from a network?

    <p>Dynamic Host Configuration Protocol (DHCP)</p> Signup and view all the answers

    What defines the current master in PROFIBUS?

    <p>Bidding process</p> Signup and view all the answers

    What is Foundation Fieldbus designed to interconnect?

    <p>Field instruments using distributed intelligence system</p> Signup and view all the answers

    What is ControlNet intended for?

    <p>Simultaneous I/O and explicit messaging</p> Signup and view all the answers

    What is the maximum number of nodes allowed on Data Highway Plus?

    <p>64</p> Signup and view all the answers

    Which signaling voltage does Data Highway Plus use?

    <p>+7 volts peak-to-peak</p> Signup and view all the answers

    What is the transmission protocol used by most other PLC manufacturers besides their proprietary method?

    <p>Modbus Remote Terminal Unit</p> Signup and view all the answers

    What is the maximum data rate of the Data Highway?

    <p>57.6 Kbps</p> Signup and view all the answers

    What is the transmission protocol originally had two modes: an ASCII mode and the RTU mode?

    <p>Modbus RTU</p> Signup and view all the answers

    What is the maximum length of a trunk line at the 57.6 Kbps data rate for Data Highway?

    <p>10,000 ft</p> Signup and view all the answers

    How does the floating master scheme in Data Highway work?

    <p>It provides a bid scheme for controllers to bid for the bus based on their priority and need.</p> Signup and view all the answers

    What does Modbus RTU protocol use as start and stop delimiters in MAC and Physical layer?

    <p>Idle time</p> Signup and view all the answers

    Which data rate is supported by Data Highway Plus?

    <p>+230 Kbps</p> Signup and view all the answers

    What type of arrangement is the Modbus RTU protocol based on?

    <p>-Master/slave polling arrangement</p> Signup and view all the answers

    What is the speed of HSE (High Speed Ethernet) in Mbps?

    <p>100</p> Signup and view all the answers

    How many devices can a non-intrinsically safe segment support in FOUNDATION Fieldbus?

    <p>2 to 30 devices</p> Signup and view all the answers

    What is the purpose of clock synchronization in FOUNDATION Fieldbus?

    <p>To maintain the same real time on all devices</p> Signup and view all the answers

    Which model does FOUNDATION Fieldbus use for background processes?

    <p>Publisher-subscriber model</p> Signup and view all the answers

    What is the main difference between the client-server model and the publisher-subscriber model?

    <p>Subscription process</p> Signup and view all the answers

    In which layer of FOUNDATION Fieldbus does system management address device tag assignment?

    <p>Application and User Layers</p> Signup and view all the answers

    What is the main purpose of the H1 fieldbus?

    <p>Connection to field devices</p> Signup and view all the answers

    'Manchester encoding' is used for placing data on the wire in which layer of FOUNDATION Fieldbus?

    <p>Data Link Layer</p> Signup and view all the answers

    What type of signal is used for preamble and start/stop delimiters in the Fieldbus Layer 2 Frame of FOUNDATION Fieldbus?

    <p>Non-valid signals</p> Signup and view all the answers

    What is the purpose of using function blocks in the Application and User Layers of FOUNDATION Fieldbus?

    <p>As interfaces between the communications protocol and the function block</p> Signup and view all the answers

    Which organization tests protocol stacks and devices for conformance to specifications in FOUNDATION Fieldbus?

    <p>Fieldbus Foundation</p> Signup and view all the answers

    What are the advantages of FOUNDATION Fieldbus compared to conventional devices?

    <p>High information flow and good control-loop performance</p> Signup and view all the answers

    What is the goal behind the ISA100 standard?

    <p>To provide reliable and secure wireless operation for monitoring, alerting, and control applications</p> Signup and view all the answers

    Which institute owns the ISA100 Compliant certification scheme?

    <p>ISA Automation Standards Compliance Institute</p> Signup and view all the answers

    What technology are SCADA systems predominantly used for?

    <p>Geographically dispersed processes</p> Signup and view all the answers

    What spurred the development of SCADA systems in the 1970s?

    <p>Introduction of 16-bit minicomputers</p> Signup and view all the answers

    What was the original purpose of the Modbus RTU protocol?

    <p>Communicating with PLCs</p> Signup and view all the answers

    What is necessary to obtain when using a device that communicates using Modbus protocol?

    <p>Vendor documentation defining function codes and data-to-register addresses</p> Signup and view all the answers

    What is the Distributed Network Protocol (DNP3) known for?

    <p>Simple, low-overhead RTU protocol</p> Signup and view all the answers

    What do all devices in a wireless subnet communicate using?

    <p>Time division multiple access (TDMA)</p> Signup and view all the answers

    What does the IEC stand for in relation to the ISA100 standard?

    <p>International Electrotechnical Commission</p> Signup and view all the answers

    What was the major purpose of forming the ISA100 committee in 2005?

    <p>To establish standards for wireless systems at the field level in automation and control environment</p> Signup and view all the answers

    What is the most basic form of RTU protocol that performs master-slave polling?

    <p>Modbus RTU protocol</p> Signup and view all the answers

    What does DNP3 support that Modbus does not?

    <p>Floating point and integer values</p> Signup and view all the answers

    What was the primary purpose of check codes in early RTU protocols?

    <p>To permit the identification of bad messages</p> Signup and view all the answers

    What feature became less of a requirement with the arrival of smart RTUs and more reliable communication error detection?

    <p>Check codes</p> Signup and view all the answers

    What does the RTU in electric utility market applications provide?

    <p>Virtual RTU to each host</p> Signup and view all the answers

    What has been a growing concern in recent years regarding RTU protocols traditionally developed for SCADA use?

    <p>Possibility of malicious manipulation of SCADA systems</p> Signup and view all the answers

    What was made possible by the computing power of RTUs reaching a certain point in the early 2000s?

    <p>Implementation of Ethernet and TCP/IP networking hardware and software</p> Signup and view all the answers

    What is a companion standard especially for basic SCADA tasks?

    <p>IEC 60870-5-101 Transmission Protocols</p> Signup and view all the answers

    What type of data does DNP3 support that SCADA RTU protocols traditionally lack?

    <p>Floating point and integer values</p> Signup and view all the answers

    What did the arrival of smart RTUs decrease as a requirement?

    <p>Check codes</p> Signup and view all the answers

    What is a major concern related to the devices used in the electric utility market?

    <p>Possibility of malicious manipulation of SCADA systems</p> Signup and view all the answers

    What was made possible by the computing power of RTUs reaching a certain point in the early 2000s?

    <p>Implementation of Ethernet and TCP/IP networking hardware and software</p> Signup and view all the answers

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