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Module 18 Assignment Questions Topic 18.1 - Introduction to PLCs (30 marks) Q1 Name the three parts of a P&ID symbol (3 marks) Type your answer here Assessor Feedback Q2 Briefly describe four functions of a PLC (in other words; what it does/can do). (4 marks) Type your answer here Assessor Feedback Q3 List five differences between PLCs and PACs. (5 marks) Type your answer here Assessor Feedback Q4 What is a SoftPLC? Use your own words. (2 marks) Don’t use the words “feature-rich”, please. Type your answer here Assessor Feedback Q5 Name four PLC program languages, and briefly describe each one. (4 marks) Type your answer here Assessor Feedback Q6 Describe the following regarding the logic ‘AND’ function: (a) what it is, (b) how it is implemented with PLC ladder logic, and (c) how it is implemented physically with relay logic. You may snag hand-drawn sketches and paste them below. (5 marks) Type your answer here Assessor Feedback Topic-18.2 Attributes of SCADA & DCS systems (20 marks) Q7 Answer the following for HMI: (a) what can it, and (b) how it can communicate with other devices. (3 marks) Type your answer here Assessor Feedback Q8 Briefly discuss the architecture of a typical SCADA system. (2 marks) Type your answer here Assessor Feedback Q9 Explain how (a) data acquisition and (b) control functions are carried out in a DCS. (4 marks) Type your answer here Assessor Feedback Q10 Describe four differences between SCADA & DCS systems. (4 marks) Type your answer here Assessor Feedback Topic-18.3 Basics of Industrial Data Communication systems (76 marks) Q11 What are the layers of the OSI model and at which layer of the OSI model is a path (routing) decision made, based upon an IP address? (4 marks) Type your answer here Assessor Feedback Q12 What is the main function of Data Link Layer? (2 marks) Type your answer here Assessor Feedback Q13 Describe the typical voltages used in an RS-232 system, and which voltage represents which typical digital value (i.e. a logical 1 or a logical 0) for the data lines. (4 marks) Type your answer here Assessor Feedback Q14 Describe four differences between RS-232 & RS-485. (4 marks) Type your answer here Assessor Feedback Q15 Please answer the following questions a) What is an Ethernet? b) To which OSI layer(s) do(es) Ethernet belong? c) What are the most common data rates for Ethernet? d) What is the IEEE standard for Ethernet? (4 marks) Type your answer here Assessor Feedback Q16 Explain how/why modern Ethernet systems are no longer collision-based. (2 marks) Type your answer here Assessor Feedback Q17 What are the four layers of the TCP/IP model? (4 marks) Type your answer here Assessor Feedback Q18 What is the purpose of the Host-Host layer in the TCP/IP protocol suite? (1 mark) Type your answer here Assessor Feedback Q19 Name three benefits of using DeviceNet Technology. (3 marks) Type your answer here Assessor Feedback Q20 Outline four differences between ProfiBus DP & ProfiBus PA. (4 marks) Type your answer here Assessor Feedback Q21 What is the difference between IEEE 802.11 and IEEE 802.15.4? (2 marks) Type your answer here Assessor Feedback Q22 What are the advantages of IEEE 802.15.4? (2 marks) Type your answer here Assessor Feedback Q23 Discuss the concept of a layered approach in industrial network security (4 marks) Type your answer here Assessor Feedback Q24 The following terms are often used in industrial network security. Briefly describe each one: (3 marks) (a) Authentication (b) Encryption (c) Firewalls Type your answer here Assessor Feedback Q25 What is OPC? (1 mark) Type your answer here Assessor Feedback Q26 What is the relationship between OPC Client & OPC Server? (2 marks) Type your answer here Assessor Feedback Topic-18.4 The operation of Process control systems (24 marks) Q27 What is the purpose of a P&ID and how do the symbols and diagrams assist in process control? (2 marks) Type your answer here Assessor Feedback Q28 An example of P&ID shown below. Please identify the items numbered 1 to 12 (6 marks) 1 2 3 4 5 6 7 8 9 10 11 12 Q29 What is Cascade Control? Explain some of the Advantages of Cascade Control. (2 marks) Type your answer here Assessor Feedback Q30 Draw a very simple diagram of a cascade control system, indicating the nature of each controller (master / slave, etc.). Note: Draw by hand, do not copy from a textbook. (5 marks) Type your answer here Assessor Feedback Q31 Explain what the D part of PID control does, and exactly how it is implemented. (2 marks) Type your answer here Assessor Feedback Topic-18.5 The Concept and Implementation of Business systems (50 marks) Q32 What is a Manufacturing Execution System? Explain why a manufacturer would implement such a system? (5 marks) Type your answer here Assessor Feedback Q33 Name four functional areas in which MES might operate? (4 marks) Type your answer here Assessor Feedback Q34 Describe the S88 batch language. (3 marks) Type your answer here Assessor Feedback Q35 Describe the scope of ISA-88 (3 marks) Type your answer here Assessor Feedback Q36 Identify and describe at least four concepts in System integration that we think lead to great designs. (4 marks) Type your answer here Assessor Feedback Q37 Describe four major differences between ISA-88 & ISA-95? (4 marks) Type your answer here Assessor Feedback Q38 Briefly describe the parts of ISA-95. (3 marks) Type your answer here Assessor Feedback Q39 Briefly describe the function and application of MOM. (2 marks) Type your answer here Assessor Feedback Question 1 Devices such as temperature transducers, pressure and flow transmitters are continuous type field devices(True/False) True False Question 2 Identify the incorrect statement Functions of user accessible memory (RAM) include 1. Storing the user PLC program 2. Storing the status of inputs and outputs 3. Storing timer, counter and register values 4. All of the above Question 3 PACs utilise a single tag-name data base and a logical address system to identify and map I/O points as needed (True/False) True False Question 4 With a 16-channel I/P card, one can access/connect to 1. 8 individual field inputs 2. 16 individual field inputs 3. 32 individual field inputs 4. 88 individual field inputs Question 5 Which statement regarding IEC 61131-3 languages is incorrect? IEC 61131 includes: 1. Relay ladder logic (RLL or LL) 2. Function Block Diagram (FBL) 3. Sequential Function Chart (SFC) 4. Instruction List (IL) 5. Structured Text (ST) 6. None- all of them are correct Question 6 In the ladder logic diagrams below, which one represents a logical OR Function? A, B, C or D on the picture below. 1. A 2. B 3. C 4. D Question 7 Which of these is not true regarding RTUs? 1. Standalone data acquisition and control unit 2. Monitors and controls equipment at some remote location from the central station 3. Not microprocessor based 4. Medium sized RTUs have 100 digital and 30 to 40 analog inputs Question 8 The data highway in DCS systems is capable of speeds only up to 1 MBits/sec (True/False) True False Question 9 SCADA, HMI, PLC & DCS all are same in their configuration. True / False True False Question 10 The layers of the OSI model, from the top down, are: 1. Application, Presentation, Session, tTansport, Network, Data link, Physical 2. Session, Presentation, Data transport, MAC, Network, Physical 3. Physical, Data link, Network, Transport, Session, Presentation, Application 4. Presentation, Application, Session, Network, Transport, Data link, Physical 5. Application, Encryption, Network, Transport, Logical link control, Physical Question 11 FTP is an application protocol that uses the Internet's TCP/IP protocols to transfer Web page files to a server. It's also used to download programs and other files from a server to your computer. True / False True False Question 12 Which of these statements is incorrect regarding IEDs? 1. IEDs are connected on a fieldbus such as Profibus, DeviceNet or Foundation Fieldbus to the PC 2. IEDs include enough intelligence to acquire data, communicate to other devices and hold their part of the overall program 3. An IED could combine an Analog Input Sensor, Analog Output, PID control, communication system and program memory in the one device 4. PC to IED fieldbus system requires large scale wiring

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Q1:
The three parts are:
a. The pictorial representation of the symbol
b. The tag giving its details
c. The connections the system component permits
Q2:
The four functions are as follows:
a. The PLC reads inputs from sensors, transducers, other PLC devices or control signals.
b. The PLC executes the code written to govern its operations.
c. The PLC produces output signals to control machinery or sends information to other PLC devices
d. The PLC device rescans the memory to check for change in the code written in it.
Q3:
a. The PLC has one processor module per rack and the PAC multiple processors per rack.
b. PLCs can be programmed using ladder logic language and PAC can be programmed using structured text, function block diagrams and ladder logic.
c. The PLC usually has memory of up to 64k whereas PAC can have memory up to 32,000K.
d. The PLC has one microprocessor per module. On the other hand the PAC has at least 2 high performance multitasking processors per module
e. The PLC can only sequentially scan logic and this is not true for the PAC
Q4:
SoftPLC is a software engine. It facilitates of emulating a PLC on a standard CPU or conventional computers. Better data manipulation and recording are possible while several different applications can be run together.
Q5:
Four PLC programming languages will be:
a. Instruction list programming: As the name implies, the instructions are listed one after another as a list and the code is executed from top to bottom.
b. Structured text programming: A high level alternative, the language is structured and is much more intuitive to understand. Arrays and loops can be declared and executed just as they are in C and FORTRAN.
c. Functional block programming: The entire program is represented using standard blocks which define the operations to be performed. Lines are used to connect one block (operation) to another.
d. Ladder logic programming: It is a graphical programming language which lists the steps of the operation in tiers sequentially
Q7:
a. An HMI or a Human machine interface is basically an interface using which a human operator is able to get informed about the system’s operation. The operator learns about the system’s operational properties such as pressure, temperature etc. measured at different process points. The operator also is able to manipulate these variables when he has the opportunity to visualize the system’s operations.
b. The operator is given a pictorial visualization of the system’s operation in which the process elements are represented by symbols and the necessary parameter values are shown at the appropriate places. Often the interface is accompanied by a simple drawing program using which the user can generate a customized symbol for a process element.
Q8:
The typical architecture includes an HMI interface, which could well be a conventional computer. This could also be just an independent operating or control panel. The control panel is usually simulated in a computer operating system. This is connected to the network using LAN or WAN (Local Area Network or Wide Area Network). The PLCs and the RTUs are connected to the HMI over the networks. These PLCs and RTUs are responsible for sending control signals to the process elements such as motors, actuators, sensors etc. The communication in between all members of the system can be two-way...

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