LogixPro PLC Lab Manual for Programmable Logic Controllers
LogixPro PLC Lab Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259680847
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 13, Problem 9RQ
Program Plan Intro

Programmable Logic Controller (PLC):

  • Programmable Logic Controller (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.

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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.
If the PLC sends back to back four messages to the transformer and receives reply of first, second, third, and fourth messages after 24msec, 21msec, 19msec and 23msec respectively. What is the maximum latency in this case? Describe your answer briefly.
5 lamps are lit at intervals of 2 seconds with the start button. When all 5 lamps are lit, it waits for 5 seconds and continues to light up with 2 second intervals from the 1st lamp. If sensor 1 is active while lamp 1 is on, lamp 3 will continue to operate as above, without lamp number 2 turning on. with stop buttonlamps will be turned off at any time.draw the plc ladder diagram accordingly.
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