Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 38, Problem 1RQ
What industry first started using programmable logic controllers?
Expert Solution & Answer
To determine
The first industry to use programmable logic controllers.
Explanation of Solution
The programmable logic controllers were first used in the automotive industry. The automotive industry started using programmable logic controllers during the late 1960s.
The automotive industry had the necessity to change the control system operation for every newly designed automobile and it required to physically rewire the control system to perform the new operations that were expensive and time consuming.
Thus, the industry required a control system that could be changed without rewiring the system. The programmable logic controllers were then used to change the control system without excessive rewiring.
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(kmol/m³.s (Ax)), and ky'.a = 0.06 (kmol/m³.s (Ay)), kx/ky = 1.35, and the equilibrium
data are:
X 0 0.0133 0.033
y 0 0.01 0.0266
0.049 0.064 0.0747 0.0933 0.1053
0.0433 0.06 0.0733
0.111
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B:
Find the numerical solution for the 2D equation below and calculate the temperature values for
each grid point shown in Fig. 2 (show all steps).
(Do only one trail using following initial values and show the final matrix)
[T1]
T₂
T3
[T] 1
=
[0]
0
0
d
dx
dx)
(ka)+4(ka)
=
dy
-20xy, k = 1 + 0.3 T
ge
L=3cm, 4x= Ay
B.Cs.:
at x=0=LT=0°C
at y=0-L T=10°C
Fig. (2)
Chapter 38 Solutions
Understanding Motor Controls
Ch. 38 - What industry first started using programmable...Ch. 38 - Name two differences between PLCs and common home...Ch. 38 - Name the four basic sections of a programmable...Ch. 38 - Prob. 4RQCh. 38 - What device is used to program a PLC?
Ch. 38 - What device separates the central processing unit...Ch. 38 - What is opto-isolation?
Ch. 38 - Prob. 8RQCh. 38 - Prob. 9RQCh. 38 - Prob. 10RQ
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