Programmable Logic Controller
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13-10-2010, 10:47 AM



.ppt   Basic_PLC.ppt (Size: 4.06 MB / Downloads: 133)


Introduction

Programmable Logic Controller ( PLC ) is a special purpose computer with digital processing capabilities, designed for real time control in industrial applications.


Controller: an equipment adapting outputs to changes in inputs as per requirement of the process
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22-11-2010, 09:17 AM

Abstract

A digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. PLCs are used in many industries and machines is called a programmable logic controller (PLC) / programmable controller. The PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact.
A PLC has many "input" terminals, through which it interprets "high" and "low" logical states from sensors and switches. It also has many output terminals, through which it outputs "high" and "low" signals to power lights, solenoids, contactors, small motors, and other devices lending themselves to on/off control. In an effort to make PLCs easy to program, their programming language was designed to resemble ladder logic diagrams. Thus, an industrial electrician or electrical engineer accustomed to reading ladder logic schematics would feel comfortable programming a PLC to perform the same control functions.
Many early PLCs did not have accompanying programming terminals that were capable of graphical representation of the logic, and so the logic was instead represented as a series of logic expressions in some version of Boolean format, similar to Boolean algebra. As programming terminals evolved, it became more common for ladder logic to be used, for the aforementioned reasons. Newer formats such as State Logic and Function Block (which is similar to the way logic is depicted when using digital integrated logic circuits) exist, but they are still not as popular as ladder logic. A primary reason for this is that PLCs solve the logic in a predictable and repeating sequence, and ladder logic allows the programmer (the person writing the logic) to see any issues with the timing of the logic sequence more easily than would be possible in other formats.

References:
en.wikipediawiki/Programmable_logic_controller
allaboutcircuitsvol_4/chpt_6/6.html
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