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[ pdf ] PROGRAMMABLE LOGIC CONTROLLERS

PROGRAMMABLE LOGIC CONTROLLERS Download
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Topic under  PLC (Programmable Logic Controller)
Source: www.eod.gvsu.edu 
File size: 220.83 KB
File type: pdf
Last download on: Thu May 25, 2017 06:40:18 PM
Short Desciption:
Topics: Objectives: • Know general PLC issues • To be able to write simple ladder logic programs • Understand the operation of a PLC • PLC History • Ladder Logic and Relays • PLC Programming • PLC Operation • An Example

Summary:
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.
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