PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 14, Problem 6RQ
Program Plan Intro
Closed-loop control system:
- A feedback path is employed in closed-loop control system to measure the original system parameters such as pressure, speed, and so on.
- Here, the controller produces an error signal which initiates corrective action and energize the output device.
- The main characteristic of a closed-loop control system is that it can sense and measure the actual output of the system.
- Examples of closed-loop systems include cooling system in car, water level controller, tracking radar systems, and many others.
Explanation of Solution
b.
Function of process variable:
- Process variable is also called as process value or process parameter and usually abbreviated as PV...
Explanation of Solution
c.
Function of error amplifier:
- Error amplifier is used to determine the matching between the set point and the process operation...
Explanation of Solution
d.
Function of controller:
- Controllers are used to produce output signals...
Explanation of Solution
e.
Function of output actuator:
- Output actuators are normally used to convert system output electrical signals into physical actions...
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5. The unit-step response of a control system is a
response when the signal applied to the input is
(a) A unit-step function
(b)
(c)
A sine function
None of the above
) In an open-loop control system:
(a) System variables effect the output signal
(b) Output signal has no control on the input signal
(c) None of the variables have any effect on the input signal
(d) None of these
Develop a PLC-based ladder logic program for automatic packaging system:
1.Draw and explain ladder logic diagram to run a conveyor motor using the following conditions:
a.AND Logic Function
b.NOR Logic Function
Analyze the following conditions:
a.Upgrade the ladder diagram such that the motor runs in both clockwise and anti-clockwise direction.
b.Use two light indicators to indicate the direction of motor rotation.
c.Use a photosensor to detect the package on the conveyor
d.Add start stop logic (Use both AND logic and OR logic, where necessary use switches to control the direction)
Chapter 14 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
Ch. 14 - Compare continuous and batch processes.Ch. 14 - Prob. 2RQCh. 14 - State the basic function of each of the following...Ch. 14 - State the purpose of each of the following types...Ch. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQ
Ch. 14 - Prob. 11RQCh. 14 - What term of a PID control is designed to...Ch. 14 - Prob. 13RQCh. 14 - Prob. 14RQCh. 14 - Prob. 15RQCh. 14 - Prob. 16RQCh. 14 - Prob. 17RQCh. 14 - Prob. 18RQCh. 14 - Prob. 19RQCh. 14 - List four types of communication tasks provided by...Ch. 14 - Prob. 21RQCh. 14 - What are the three general levels of functionality...Ch. 14 - Prob. 23RQCh. 14 - Prob. 24RQCh. 14 - Compare device and process bus networks.Ch. 14 - Prob. 26RQCh. 14 - Prob. 27RQCh. 14 - Prob. 28RQCh. 14 - Prob. 29RQCh. 14 - Summarize the collision detection network access...Ch. 14 - Prob. 31RQCh. 14 - Prob. 32RQCh. 14 - Prob. 33RQCh. 14 - Prob. 34RQCh. 14 - Prob. 35RQCh. 14 - Prob. 36RQCh. 14 - Prob. 37RQCh. 14 - Prob. 38RQCh. 14 - Prob. 39RQCh. 14 - Explain how redundant media works.Ch. 14 - Prob. 41RQCh. 14 - Prob. 42RQCh. 14 - Prob. 43RQCh. 14 - Prob. 44RQCh. 14 - Summarize the two main functions of a SCADA...Ch. 14 - Prob. 46RQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - How would an on/off controller respond if the...Ch. 14 - In a home heating system with on/off control, what...Ch. 14 - a. Calculate the proportional band of a...Ch. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Prob. 8P
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