Roll No. ………………….. Lingaya’s University B .T ech 3 r d Year (T er m – I X ) E n d T erm E xa mi n ati on May - Ju n e 2012 Prog ra mmab l e L og i c Con trol l ers & S CADA (E E – 401 ) [Time: 3 Hours] [Max. Marks: 100] Before answering the question, candidate should ensure that they have been supplied the correct and complete question paper. No complaint in this regard, will be entertained after examination. Note: – Attempt five questions in all. All questions carry equal marks. Question no. 1 (Section A) is compulsory. Select four questions from Section B. Section – A Q-1. Part – A Select the correct answer of the following multiple choice questions: [10×1=10] (i) (ii) Which of the following is/are component of a typical PLC? (a) CPU (b) Memory module (c) Power supply (d) All of these Which of the following is not a programming device of a PLC? (a) Hand-held device (b) Printer 1 (c) Dedicated desktop programmer (d) Computer programmer (iii) Which of following is a type of volatile memory? (a) PROM (b) EPROM (c) EEPROM (d) RAM (iv) Input image table is a part of (v) (a) User memory (b) Storage memory (c) Output image table (d) None of these In PLC architecture, internal utility relays (dummy relays) are (a) Physically exist (b) Software simulated (c) Do not exist (d) None of these (vi) In ladder diagram, devices or components are generally shown in their (a) Excited condition (b) Normal condition (c) Energized condition (d) None of these (vii) In ladder diagram, devices, that perform a STOP function, are generally wired in (a) Parallel (b) Series (c) Both (a) and (b) (d) None of these (viii) If a ladder logic program is improperly written then the program execution time will be: (a) More (b) Less (c) Not affected (d) None of these 2 (ix) Which of the following is not a type of program control instruction a typical PLC (Allen-Bradley SLC-500)? (x) (a) JMP (b) LBL (c) DAA (d) RET Which of the following is not a component of SCADA? (a) Remote Technical Unit (RTU) (b) Master station and HMI computer(s) (c) Memory Distribution module (d) Communication infrastructure Q-1. Part – B (i) Define analog and discrete I/O modules with examples. [5] (ii) Briefly describe Pneumatic and cascading timers. [5] Section – B Q-2. (a) Draw a neat diagram of a typical PLC and explain its different components. [10] (b) Explain fixed I/O section and modular I/O sections. How fixed I/O section is different from modular I/O sections? [10] Q-3. (a) Explain memory organization of a PLC. Give the configuration of the storage memory of a typical PLC. [10] 3 (b) Explain guarding against electrostatic discharge (ESD) and precautions taken to reduce the possible damage from it. [10] Q-4. (a) What is a programming device? Explain different types of programming devices. [10] (b) Discuss advantages and disadvantages of different programming devices. [10] Q-5. (a) Explain the working of a basic stop/start circuit of a typical PLC. [10] (b) Define wiring diagram and ladder diagram. Briefly describe different ladder diagram rules. [10] Q-6. (a) Define and describe the importance of program control instruction in PLC programming. [10] (b) What do you mean by master control relay instruction? Explain with an example. [10] Q-7. (a) Explain the SCADA system with a neat block diagram. [10] (b) What is automatic SCADA? Describe the hierarchical of SCADA? [10] Q-8. Write short notes on any Two of the following-(i) Network limitation of a PLC (ii) Processor scan (iii) Remote Technical Unit (RTU) [20] 4