... 2. PROGRAMMABLE LOGIC CONTROLLERS Topics: • PLC History • Ladder Logic and Relays • PLC Programming • PLC Operation • An Example Objectives: • Know general PLC issues • To be able to write simple ladder logic programs • Understand the operation of a PLC 2.1 INTRODUCTION Control engineering has evolved over time. In the past humans were the main method for controlling a system. More recently electricity has been used for control and early electrical control was based on relays. These relays allow power to be switched on and off without a mechanical switch. It is common to use relays to make simple logical control decisions. The development of low cost computer has brought the most recent revolution, the Programmable Logic Controller (PLC). The advent of the PLC began in the 1970s, and has become the most common choice for manufacturing controls. PLCs have been gaining popularity on the factory floor and will probably remain predominant for some time to come. Most of this is because of the advantages they offer. • Cost effective for controlling complex systems. • Flexible and can be reapplied to control other systems quickly and easily. • Computational abilities allow more sophisticated control. • Trouble shooting aids make programming easier and reduce downtime. • Reliable components make these likely to operate for years before failure. 2.1.1 Ladder Logic Ladder logic is the main programming method used for PLCs. As mentioned before, ladder logic has been developed...
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...Study Guide: Lesson 4 A Little Logic Lesson Overview Logic is the primary tool or methodology in studying philosophy. Philosophy is about analyzing and constructing arguments and a good understanding of the basics of logical reasoning is essential in performing that task. The next 3 lessons will focus on logic and analyzing arguments. In this lesson, you will first be introduced to the laws of logic. These are the first principles for all reasoning. We will then discuss the specialized terminology we use in logic. Finally, we will examine 2 major kinds of logical reasoning: deductive and inductive. We will consider different forms of arguments under each and discuss how to evaluate these arguments. Take note that a large part of this lesson is about learning the terminology for logic. Tasks Read and take notes from chapter 5 of Philosophy: Critically Thinking about Foundational Beliefs, “A Little Logic.” As you read, make sure you understand the following points and questions: * Why are the laws of logic foundational? * The Law of Logic makes discourse possible. If they are not recognized as true, than nothing we claim makes any sense. Therefore, it is important to have a firm grasp of these laws. * List and explain the 3 laws of logic. 1. Noncontradiction – “Something cannot both be and not be at the same time and in the same respect. Expressed symbolically: ~ (P•~P).² It reads, “It is not the case that there can be both P and non-P”. 2....
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...LOGIC GATES In electronics, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output. Depending on the context, the term may refer to an ideal logic gate, one that has for instance zero rise time and unlimited fan-out, or it may refer to a non-ideal physical device[1] (see Ideal and real op-amps for comparison). Logic gates are primarily implemented using diodes or transistors acting as electronic switches, but can also be constructed using electromagnetic relays (relay logic), fluidic logic, pneumatic logic, optics, molecules, or even mechanical elements. With amplification, logic gates can be cascaded in the same way that Boolean functions can be composed, allowing the construction of a physical model of all of Boolean logic, and therefore, all of the algorithms and mathematics that can be described with Boolean logic. Logic circuits include such devices as multiplexers, registers, arithmetic logic units (ALUs), and computer memory, all the way up through complete microprocessors, which may contain more than 100 million gates. In practice, the gates are made from field-effect transistors (FETs), particularly MOSFETs (metal–oxide–semiconductor field-effect transistors). Compound logic gates AND-OR-Invert (AOI) and OR-AND-Invert (OAI) are often employed in circuit design because their construction using MOSFETs is simpler and more efficient than...
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...Boolean Algebraic Identities Boolean Addition and Subtraction Complementary Gates (NOT) Boolean complementation finds equivalency in the form of the NOT gate, or a normallyclosed switch or relay contact: Topic Notes: • Boolean addition is equivalent to the OR logic function, as well as parallel switch contacts. • Boolean multiplication is equivalent to the AND logic function, as well as series switch contacts. • Boolean complementation is equivalent to the NOT logic function, as well as normallyclosed relay contacts. 1 Boolean algebraic identities The algebraic identity of x + 0 = x tells us that anything (x) added to zero equals the original ”anything,” no matter what value that ”anything” (x) may be. Like ordinary algebra, Boolean algebra has its own unique identities based on the bivalent states of Boolean variables. The first Boolean identity is that the sum of anything and zero is the same as the original ”anything.” This identity is no different from its real-number algebraic equivalent: No matter what the value of A, the output will always be the same: when A=1, the output will also be 1; when A=0, the output will also be 0. The next identity is most definitely different from any seen in normal algebra. Here we discover that the sum of anything and one is one: Next, we examine the effect of adding A and A together, which is the same as connecting both inputs of an OR gate to each other and activating them with the same signal: Introducing the uniquely...
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...Implementing knowledge bases 1. Concepts in Knowledge representation methods • Some of the techniques applied include o Relational Databases o Production Rules o Logic Representation o Frames o Case-bases • Graphic Representations include: o Semantic Networks o Decision Trees o 2. Production Rules Production Rules are program codes that follow the format IF…THEN…ELSE Eg IF international Conflict Begins AND it is in Middle East THEN oil price goes up. ✓ Symbolically: ✓ IF A AND B THEN C Example Consider the following information given by consumers surveying bureau of Kenya Let the rules and symbols be as follows: ✓ “if one leaves near Muthaiga road (A)and has a plump salary(B) then he is likely to join muthaiga golf club(C). ✓ One can say he leaves near Muthaiga road(A) if he leaves less than 15 kilometers off the road.(D) ✓ The survey also reveals that you have to have a plump income (B) and be a who-is-who in Nairobi(E) so that you can join an exclusive club(F). ✓ If you can join an exclusive club(F) then you are likely to meet politicians(G). ✓ One who meets politicians (G)is said to be well connected(H). ✓ If one can join exclusive (F) and is a who-is-who in Nairobi (E) then he is well connected.(H) ✓ If well connected then (H)one can join Muthaiga golf...
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...number of the book's printing. For example, a printing code of 92-23 shows that the twenty-third printing of the book occurred in 1992. Printed in the United States of America. Preface I don't like to revise books. Correct, yes. Revise, no. So I won't. A book becomes history the instant it appears in print. To tamper with history messes with what others and I were thinking at the time and distorts the way things were, forcing new contexts. With the TTL Cookbook, it is now January 1982, and this book is eight years old. It is also one of the best selling technical paperback classics of all time. And looking around, both nothing has changed and everything has changed. ITL is still the largest and most popular general purpose logic family, although it now shares the spotlight with an only somewhat...
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...Work and has a price tag of $12.95. The author, D.Q. McInerny, is a professor of philosophy and has taught logic at several institutes of higher learning before ending up at Our Lady of Guadalupe Seminary in Lincoln, Nebraska. He has written works on religious philosophy and has collaborated on three text books concerning philosophy and logic. McInerny has written with conviction but believes that logic must be exercised in the educational process (McInerny, 2005). In this particular work, McInerny attempts to make his readers understand logic by seeing their surroundings and environments in an objective and critical manner (McInerny, 2005). He is able to do so in lay-man’s terms that almost any reader would be able to comprehend. This piece was written as a handbook for presenting the very basic values of logic to people who have never had the chance to practice it before. Those that have been well versed in logic before may easily lose interest in a work this simplified. Summary Being Logical is organized into five parts: 1) Preparing the Mind for Logic; 2) The Basic Principles of Logic; 3) Argument: The Language of Logic; 4) The Sources of Illogical Thinking; and 5) The Principal Forms of Illogical Thinking (McInerny, 2005). Every part is broken down further and goes more in depth to its specific components. This helps to make the teaching of logic to not be too overwhelming. The first three serve as a foundation for logical thinking. The last two sections...
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...DESIGNING SYNCHRONOUS FIFO AND ITS VERILOG IMPLEMENTATION IN HARDWARES Submitted in partial fulfillment for the requirement for the award of degree of bachelor of technology in Electronics and Telecommunication Engineering [pic] School of Electronics Engineering KIIT UNIVERSITY Batch: 2008-2012, Group-8 Under the guidance of Mr. S.Padhi An End-Semester Project Report Submitted by: Akshay Prakash-804008 Avinash Kumar-804029 Ayush Bansal-804031 Barun Kumar-804034 Deepak Kumar Barnwal-804044 KIIT UNIVERSITY, BHUBANESWAR [pic] CERTIFICATE This certificate is to certify that this report entitled “AUTOMATIC VEHICLE PASS USING IMAGE PROCESSING” being submitted by Group-34: Akshay Prakash-804008 Avinash Kumar-804029 Ayush Bansal-804031 Barun Kumar-804034 Deepak Kumar Barnwal-804044 in partial fulfillment of the degree of Bachelor in Technology in “Electronics and Telecommunication engineering” is a bonafide work carried out at KIIT University under the supervision of project guide Prof. S.Padhi Prof A. K. Sen Mr. S.Padhi Dean E&TC Deptt. E&TC Deptt. KIIT University KIIT University TABLE OF CONTENTS: • ACRONYMS ………………………………………………………...3 • ACKNOWLEDGEMENT …………………………………………...4 • HISTORY ……………………………………………………………5 • ABSTRACT...
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...proposal for the Directed Research Project (DRP). The DRP, a major research paper on a topic (or problem) in your discipline, is a requirement of your graduate work at Strayer. The proposal for the DRP comprises the following sections: 1. Context of the problem. 2. Statement of the problem. 3. Research questions. 4. Significance of the study. 5. Research design and methodology. 6. Organization of the study. 7. Tentative reference list. You will develop and submit one (1) of these sections every week. After each has been graded and returned to you, you will have an opportunity to revise it before assembling all of the sections into your final paper, to be submitted in Week 11. Note that the DRP Manuscript Guidebook is available at https://sunow.strayer.edu/sites/academics/ap/pi/Memos/DRP Manual.pdf Context of the Problem “The Context of the Problem sets up the research statement with background, purpose, and perhaps some support from the literature or acceptable literature alternatives. It is here that the DRP problem or issue is discussed and gives a transitory explanation of what the completed research work-product will most likely contain.” DRP Manuscript Guidebook This is the first section of your Research Proposal paper. Submit a one to two (1-2) page description of the problem, following these criteria: 8. Describe the history of the problem and why it is a problem. 9. Identify where and for...
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...LO Extraction: Part 3 Extractor Logic Applies to: SAP BI, SAP BW, ECC, ABAP, Business Intelligence Summary This part of the article explains the logic behind the LO Extractors and the relevant backend tables with the details on important function modules. Author: P Renjith Kumar Company: SAP Labs India Pvt Ltd Created on: 26 August 2010 Author Bio P Renjith Kumar is presently working in SAP Labs India Pvt Ltd and specializes in Extraction and Modeling areas of BI. Basically as an ABAP consultant, he has extensive cross functional experience and has been with end to end SAP ERP and BI implementation projects across manufacturing domain. . SAP COMMUNITY NETWORK © 2010 SAP AG SDN - sdn.sap.com | BPX - bpx.sap.com | BOC - boc.sap.com | UAC - uac.sap.com 1 LO Extraction: Part 3 Extractor Logic Table of Contents The Design of the New Extract Structures ......................................................................................................... 3 Datasource.......................................................................................................................................................... 4 Datasource Activation ......................................................................................................................................... 5 Extraction Structure ............................................................................................................................................ 5 Setup Table...
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...Introduction to Discrete Structures --- Whats and Whys What is Discrete Mathematics ? Discrete mathematics is mathematics that deals with discrete objects. Discrete objects are those which are separated from (not connected to/distinct from) each other. Integers (aka whole numbers), rational numbers (ones that can be expressed as the quotient of two integers), automobiles, houses, people etc. are all discrete objects. On the other hand real numbers which include irrational as well as rational numbers are not discrete. As you know between any two different real numbers there is another real number different from either of them. So they are packed without any gaps and can not be separated from their immediate neighbors. In that sense they are not discrete. In this course we will be concerned with objects such as integers, propositions, sets, relations and functions, which are all discrete. We are going to learn concepts associated with them, their properties, and relationships among them among others. Why Discrete Mathematics ? Let us first see why we want to be interested in the formal/theoretical approaches in computer science. Some of the major reasons that we adopt formal approaches are 1) we can handle infinity or large quantity and indefiniteness with them, and 2) results from formal approaches are reusable. As an example, let us consider a simple problem of investment. Suppose that we invest $1,000 every year with expected return of 10% a year. How much...
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...[pic] |Leadership and Organizational Behavior – BUS 520 | |Student Course Guide | |Prerequisite: None | |Quarter |Fall 2010 | |Meeting Days/Time |Wednesday 6pm-10pm | |Instructor |Karmetria Burton | |Instructor Phone |678 362 0842 | |Instructor E-mail |Karmetria.burton@strayer.edu | |Instructor Office Hours/Location |5-6 pm Wednesdays or by appointment | |Academic Office Phone Number | | |INSTRUCTIONAL MATERIAL - Required ...
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...J-K Flip-Flop Basic R-S Flip-Flop Basic flip-flops are designed to ‘store’ a logic state. The simplest flip-flop is known as the R-S flip-flop, which consists of two NAND gate wired to give negative feedback and is shown in Figure 1. S NAND Q R NAND Q R-S Flip-Flop Figure 1 Simple NAND R-S Flip-Flop In normal operation the, with the reset (R) set to logic ‘0’ the output Q will follow the logic level applied to the set (S) input. When R is set to logic ‘1’ whatever was set on Q will remain regardless on whether the S input continues to change until the reset input is returned to logic ‘0’. The major drawback of this circuit is that it is not possible to predict the output when a logic ‘1’ is simultaneously applied to the S & R inputs. Therefore, more complex Flip-flops are designed to ensure that these indeterminate states do not exit and the most common circuits are D-type and J-K Flip-flops. Sheet 2 of 3 J-K Flip-Flop The basic J-K Flip-flop is shown in Figure 2. J NAND NAND Q Clk K NAND Q NAND Slave Latch Figure 2 Simple J-K Flip-flop Like the R-S flip-flop the outputs follow the inputs when the Clk is logic, but there are two inputs, traditionally labelled J and K. If J and K are different then the output Q takes the value of J at the next clock edge. If J and K are both low then no change occurs. If J and K are both high at the clock edge then the output will toggle from one state to the other. It can perform the functions...
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...appeals the logic of the individual in order to jointly make an impression on each reader. These three methods of persuasion have remained throughout the evolution of advertising, and with the impact they allow advertisements to make, they will continue to be a constant aspect of advertising in the future. This Post It advertisement is a humorous appeal to the everyday reader. The average person, young or old, cannot wait for the weekend and the adventures that come along with it. This particular aspect of those adventures deal with the morning after releasing all of that weekday angst. That awkward moment when you wake up and want to know what happened, where it happened, and who with. Whether they had a one night stand or simply were too inebriated to remember a new friend’s name, everyone has had an awkward moment like this pictured above. The note attached to the woman’s forehead seems to be the key to avoid such an awkward situation and being a bad host. This advertisement implies that with Post It notes in hand, the reader will not have to worry about seeming like a bad person and that if unavoidable, these notes will help to aid whatever situation comes their way. The advertisement also uses Pathos to exploit each reader’s emotions. The embarrassment, shame, and confused feelings that each person experiences when confronted with this type of situation are exactly what Pathos is appealing to. This picture portrays a mortifying situation, but the Post It note saves the...
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... |Matric No: | Laboratory 2 : Interfacing to Liquid Crystal Display(LCD) module. Objectives: i) To learn how to initialise the LCD module. ii) To learn how to output messages. Equipment: i) Computer with floppy drive/USB port ii) MPLAB ICD 2 and target board Software: i) MPLAB IDE v8.xx ii) MCC18 ver3.33 References: i) MPLAB-IDE User’s Guide ii) MPLAB C18 C Compiler Getting Started iii) MPLAB C18 C Compiler User’s Guide iv) MPLAB ICD2 In-Circuit Debugger User’s Guide Note: Each student is to bring along the PIC18F4520 Concise Data Book and a storage device that is reserved for this subject for every lab session. In order that you benefit fully from this laboratory exercise, you are strongly encouraged to read the following reading notes before you come for this laboratory session. Reading Notes For microcontroller applications, it may be required to interact with a human being. Examples include displaying messages using a LCD module (known as output device) and entering information using the keypad (known as input device). One of the most commonly used LCD module is the 16x2 displays that can display 2 lines of 16 characters each. Fortunately, a very popular standard from Hitachi exists that allows the users to communicate with the vast...
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