MODULE TITLE : PROGRAMMABLE LOGIC CONTROLLERS TOPIC TITLES : PROGRAMMABLE FACILITIES AND ADDITIONAL FACILITIES TUTOR MARKED ASSIGNMENT 3
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1 THIS BOX MUST BE COMPLETED Student Code No.... Student's Signature... Date Submitted... Contact ... MODULE TITLE : PROGRAMMABLE LOGIC CONTROLLERS TOPIC TITLES : PROGRAMMABLE FACILITIES AND ADDITIONAL FACILITIES TUTOR MARKED ASSIGNMENT 3 NAME... ADDRESS HOME TELEPHONE... EMPLOYER WORK TELEPHONE... PLC TMA (v1)
2 Published by School of Science & Engineering Teesside University Tees Valley, UK TS1 3BA +44 (0) All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without the prior permission of the Copyright owner. This book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher's prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser.
3 1 IMPORTANT Before you start please read the following instructions carefully. 1. This assignment forms part of the formal assessment for this module. If you fail to reach the required standard for the assignment then you will be allowed to resubmit but a resubmission will only be eligible for a Pass grade, not a Merit or Distinction. You should therefore not submit the assignment until you are reasonably sure that you have completed it successfully. Seek your tutor's advice if unsure. 2. Ensure that you indicate the number of the question you are answering. 3. Make a copy of your answers before submitting the assignment. 4. Complete all details on the front page of this TMA and return it with the completed assignment including supporting calculations where appropriate. The preferred submission is via your TUOL(E) Blackboard account: 5. Your tutor s comments on the assignment will be posted on Blackboard.
4 2 1. Design and draw a ladder diagram circuit suitable for a PLC which will fulfil the following control requirement: A momentary push switch is to be recognised, remembered and used to switch on an output for a period of 30 seconds. After 30 seconds this output is to be switched off and must be off for 0.5 seconds before a second output switches on. The second output remains on until a second push switch is operated to turn it off. If the second push is operated at any time then the current output must turn off and the system await the press of the first push. The rungs of the ladder diagram must contain interlock contacts which prevent both outputs being on at the same time. 2. Redesign and improve the pelican crossing ladder diagram given of FIGURE 1 of lesson PLC by adding timer rungs and counter rungs between rungs 12 and 14 (or any similar workable scheme) together with the necessary contacts inserted in the amber and green man lights of rungs 7 and 10, etc. The chart below shows the required sequence of events. Note that a section of the chart is repeated a total of 16 times. The time intervals are given below. Time periods Green road light ON ON OFF OFF OFF OFF... OFF OFF ON Red road light OFF OFF OFF ON OFF OFF... OFF OFF OFF Amber road light OFF OFF ON OFF ON OFF... ON OFF OFF Wait sign OFF ON ON OFF OFF OFF... OFF OFF OFF Green man OFF OFF OFF ON ON OFF... ON OFF OFF Red man ON ON ON OFF OFF OFF... OFF OFF ON first sixteenth occurrence time
5 3 Time period 1 is the 'normal' conditions. Time period 2 is after the pedestrian presses the push button. The change from period 2 to period 3 can only be made after at least one five second check of the road sensors. The time interval between 3 and 4 is 4 seconds. The time interval between 4 and 5 is 10 seconds. The time interval between 5 and 6 is 0.5 seconds. The time interval between 6 and 7 is 0.5 seconds. It is not necessary to show the whole of the traffic light ladder diagram of lesson PLC - 6-2, only rungs which have been modified. There must, however, be a comprehensive explanation of the operation of the modified rungs accompanying the modified ladder diagram.
6 4 3. The chart below shows a required set of step sequences with the same time interval between steps. Provide a ladder diagram and a comprehensive explanation as a solution for this chart by using two eight-bit shift registers (SFT0 controls relays 50 to 57, SFT1 controls relays 60 to 66). The sequence is to have an initial start signal and thereafter can be free running. A reset control and timer to clock the shift registers must be provided. STEP No. OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 RESET all outputs off RESET 1 ON 1 2 ON ON 2 3 ON ON ON 3 4 ON ON ON 4 5 ON ON ON 5 6 ON ON ON 6 7 ON ON 7 8 ON 8 9 ON ON 9 10 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON STEP 1 and 15 Return to step 2
7 5 4. (a) An A/D conversion circuit with 10 bit resolution has an input range of 0 5 V. A second has a 12 bit resolution and an input range of 0 10 V. Calculate the digital output value that will represent a 2 V input for both of the A/D converters. Convert the digital levels in both cases to hexadecimal and then to binary values. (b) Explain briefly from what you notice about the digital output values in (a) why a digital output value of an A/D converter is rarely the exact same digital value as the analogue input value. (c) State briefly why a PLC A/D module haveing 4 analogue input channels would probably not incorporate 4 internal A/D circuits. (d) State briefly which of the two digital output values in (a) is the more accurate and why. 5. Explain briefly the technique of multiplexed switching of analogue signals. 6. The diagram of FIGURE 1 shows a 3 input R/2R digital to analogue converter circuit. By working back from the output (or otherwise) to find the equivalent input resistance in order to determine the input voltage, show that the output voltage values for the following digital input combinations are as shown below. A B C V (volts) out (i) (ii) (iii) (iv) V 12 4 V 12 3 V 12 in in in or 1 V 3 in or 1 V 4 in
8 6 A B C 2R 2R 2R F R E R D Analogue output 2R 2R V out 0 volts FIG State briefly: (i) what is meant by a LAN (ii) types of LAN (iii) an application of LANs (iv) the types of cable likely to be used in a LAN (v) the meaning of RTU (vi) what the current title of EIA 422 is and to what it relates (vii) to what the protocal IEEE-488 relates.
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