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Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 7, Problem 6RQ
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.
Timer:
- Timer is mainly used to keep an output ON for a specific length of time.
- It provides a preset delay to the control actions.
- In a timer, the output will be energized when the preset value becomes equal to the accumulated value.
- Three different types of timers include Delay-OFF timer, Delay-ON timer and Delay-ON-Retentive timer.
Explanation of Solution
b.
Resetting the accumulated count to zero:
- The accumulated count of retentive timers can be reset to zero by using a separate reset signal.
- This separate signal is known as Retentive Timer Reset (RES) instruction.
- When RES is true, the accumulated value of the timer is reset to zero...
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Students have asked these similar questions
What is the use of the prescalar in the operation of the timer?
Select one:
O a. for fast calculations
O b. for removing the concept of the reloading of count
Oc.
for increasing the time delay given by the timer by decreasing its frequency of operation
O d. for easy counter operations
Briefly answer the following question (No partial credits)
Suppose that we want to use the following timer/counter structure as part of a turnstile
machine to detect the number of passengers passing through a gate entrance. We will use a
sensor placed on the turnstile machine such that every time a passenger passes through the
gate entrance, the sensor will send a pulse to the timer/counter to indicate that a new
passenger has passed through the entrance.
In order to correctly count the events (number of passengers passing through), indicate the
logic value that we should set in the "Ctr" signal in the "Clock Select" block in the diagram
below. Justify your answer.
TOVN
DATA BUS
(Int.Req.)
Clock Select
Count
Edge
Detector
Tn
clear
cik
TCNTn
Control Logic
direction
(From Prescaler)
Ctr
bottom
top
Given the following C code, what does the printf statement print? Please use the table next
to the code to show your answer.
tinclude
Loop iteration varl var2 var3
#include
i=1
uint8_t varl;…
Write python code for a "Count down clock and timer"
Explain how the code works
Chapter 7 Solutions
Activities Manual for Programmable Logic Controllers
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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