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 (B)</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% (C)</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 (A)</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 (C)</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; (D)</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 (A)</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 (D)</p> Signup and view all the answers

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

<p>Using distributed control (A)</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 (B)</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 (C)</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 (A)</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) (C)</p> Signup and view all the answers

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

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

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

<p>Vendor-proprietary LANs (B)</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 (C)</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 (C)</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. (B)</p> Signup and view all the answers

What type of network is DeviceNet?

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

Which industrial network uses the Dynamic Host Configuration Protocol?

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

What is the data rate provided by the HART protocol?

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

What differentiates PROFIBUS PA from PROFIBUS DP?

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

Which industrial network uses the EIA-709 standard?

<p>LonWorks (C)</p> Signup and view all the answers

What does FOUNDATION Fieldbus handle in two different modes?

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

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

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

What is LonWorks' major market according to the text?

<p>Building automation (A)</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) (B)</p> Signup and view all the answers

What defines the current master in PROFIBUS?

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

What is Foundation Fieldbus designed to interconnect?

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

What is ControlNet intended for?

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

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

<p>64 (D)</p> Signup and view all the answers

Which signaling voltage does Data Highway Plus use?

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

What is the maximum data rate of the Data Highway?

<p>57.6 Kbps (A)</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 (B)</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 (B)</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. (C)</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 (D)</p> Signup and view all the answers

Which data rate is supported by Data Highway Plus?

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

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

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

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

<p>100 (B)</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 (D)</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 (B)</p> Signup and view all the answers

Which model does FOUNDATION Fieldbus use for background processes?

<p>Publisher-subscriber model (D)</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 (A)</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 (A)</p> Signup and view all the answers

What is the main purpose of the H1 fieldbus?

<p>Connection to field devices (D)</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 (B)</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 (B)</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 (D)</p> Signup and view all the answers

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

<p>Fieldbus Foundation (B)</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 (B)</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 (C)</p> Signup and view all the answers

Which institute owns the ISA100 Compliant certification scheme?

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

What technology are SCADA systems predominantly used for?

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

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

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

What was the original purpose of the Modbus RTU protocol?

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

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

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

What do all devices in a wireless subnet communicate using?

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

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

<p>International Electrotechnical Commission (A)</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 (A)</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 (D)</p> Signup and view all the answers

What does DNP3 support that Modbus does not?

<p>Floating point and integer values (B)</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 (A)</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 (A)</p> Signup and view all the answers

What does the RTU in electric utility market applications provide?

<p>Virtual RTU to each host (A)</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 (B)</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 (C)</p> Signup and view all the answers

What is a companion standard especially for basic SCADA tasks?

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

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

<p>Check codes (D)</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 (A)</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 (D)</p> Signup and view all the answers

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