Build the Nation

In: Social Issues

Submitted By premsaradhi27
Words 4945
Pages 20
INTERNATIONAL J OURNAL OF M ULTIDISCIPLINARY S CIENCES AND ENGINEERING, VOL . 2, NO. 8, NOVEMBER 2011

PLC and its Applications
Sadegh vosough1 and Amir vosough2 Department of Electronics, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran Department of Mechanics, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran vosough.sadegh@yahoo.com, vosoogh_amir@yahoo.com

Abstract— In this paper about the important concept of PLC and its application has been discussed. Early PLCs were designed to replace relay logic systems. These PLCs were programmed in "ladder logic", which strongly resembles a schematic diagram of relay logic. The main difference from other computers is that PLCs are armored for severe conditions (such as dust, moisture, heat, cold etc) and have the facility for extensive input/output (I/O) arrangements. PLC applications are typically highly customized systems so the cost of a packaged PLC is low compared to the cost of a specific custom-built controller design. On the other hand, in case of mass-produced goods, customized control systems are economic due to the lower cost of the components, which can be optimally chosen instead of a "generic" solution, and where the non-recurring engineering charges are spread over thousands or millions of units. Keywords– PLC-Feathers, Application of PLC and Ladder Logic

I.

INTRODUCTION

C

ontrol engineering has evolved over time. In the past humans were the main methods for controlling a system. More recently electricity has been used for control and early electrical control 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) [1]. The advent of the PLC began in the 1970s,…...

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