PROGRAMMABLE LOGIC CONTROLLERS (LL)
PROGRAMMABLE LOGIC CONTROLLERS (LL)
5th Edition
ISBN: 9781260844146
Author: Petruzella
Publisher: MCG
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Chapter 6, Problem 6P
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 are the assumptions regarding the hardwired control circuit.

  • A Normally Closed (NC) pushbutton PB1 is used.
  • Pushbuttons PB2 and PB3 are wired using one set of Normally Open (NO) contacts.
  • The Overload (OL) contact is hardwired.

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Create a PLC ladder logic diagram for an alarm that turns on when either A counts up to 10, or B counts down to 7.
Write a Ladder Logic PLC program for each of the following scenarios.  Label all contacts and coils in the PLC program. Scenario 1 Turn on a light when either one of two switches (I1, I2) is toggled on (construct an OR Gate).  Turn on a second light when both switches (Same inputs I1, I2) are toggled on (construct an AND Gate).  Turn on a third light when both switches (Same inputs I1, I2) are toggled off (construct a NOR Gate).  Turn on a fourth light when either switch (Same inputs I1, I2) is toggled off (construct a NAND Gate).  Print a copy of the program showing the construction of the four gate configurations.  Also, submit a truth table for the four input configurations.    Then modify your program so, only one light turns on at a time as you toggle the four truth table states. Scenario 2 Construct a seal-in circuit using a stop-and-start pushbutton and an internal coil to seal in.  Turn on a light for 10 seconds when the start button is pushed then turn it off automatically or…
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