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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/
Module Title: Mechatronics 3
Module Code: MECH
School: Mechanical and Process Engineering
Programme Title: Bachelor of Engineering in Mechanical Engineering – Year 3 Bachelor of Engineering in Manufacturing Engineering – Year 3 Bachelor of Engineering in Mechanical Engineering (ACCS) – Year 3
Programme Code: EMECH_7_Y EMANF_7_Y EMECN_7_Y
External Examiner(s): Mr Mike McKeon, Dr Eamonn Ahearne Internal Examiner(s): Mr Michael Murray
Instructions: Candidates are required to answer FOUR questions
Duration: 2 Hours
Sitting: Winter 2011
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination. If in doubt please contact an Invigilator.
Q1. (a) A motor, driving a conveyor, is switched by a contactor and controlled using a start push-button and a stop push-button. When the start button is pressed, an alarm sounds for 5 seconds before the conveyor starts. On pressing the stop button all activity ceases. Write a PLC program to perform this task. [10 marks]
(b) For the following switching function:
f ABCD ABCD ABCD ABCD ABCD ABCD
i. Draw the Truth Table. [5 marks] ii. With the aid of a Karnaugh map reduce the function to its simplest form. [10 marks]
Q2. A pneumatic training board, controlled by a PLC, is required to move a small
object from one holder to another, a distance less than 600mm.
Produce a design brief of the product that will include:
- A drawing of the proposed board, [5 marks]
- Information on sensors, switches and actuators to be used, [ 10 marks]
- A PLC program to demonstrate the functionality of the board [ 10 marks]
Q3. (a) Describe a closed loop control system of your choice using a block diagram to
illustrate your answer. Explain what is meant by ‘disturbance’ and discuss how its effect on system response can be minimised. [15 marks] (b) Describe what is meant by the terms ‘error signal’ and ‘dead band’. [10 marks]
