PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
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Chapter 6, Problem 8P
Program Plan Intro

Programmable Logic Controller (PLC):

  • PLC is a specialized computer used in industrial segments to control machines and process.
  • PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
  • The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
  • When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
  • The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling programming language.

Given:

The following motor control specifications must be satisfied by the ladder logic program.

  • Each starter must operate from its own start/stop pushbutton station to wire three starters.
  • A master stop station is included, which will trip out all of the starters when pushed.
  • All pushbuttons must be wired by one set of Normally Open (NO) contacts.
  • An overload on any one of the starters will automatically drop all the starters by programming overload relay contacts.

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