Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 9, Problem 4RQ
Program Plan Intro
a.
Jump instruction:
In PLC
Jump to Label instruction:
The jump to label instruction either jumps forward or backward to the corresponding label instruction.
Explanation of Solution
b.
Affecting jumped rungs:
- At the time of executing a jump-to-label instruction, the jumped rungs are not scanned by the processor...
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Question D.4: FIFO Page Replacement
Consider the following page reference string:
e, c, b, e, a, g, d, c, e, g, d, a
Considering 4 frames, fill in the following table and then answer how many page faults would occur with the
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RS: reference string; FO: frame 0, F1: frame 1, etc.
Hint: all frames are initially empty, so your first unique pages will all cost one fault each.
Time
1234567891011
12
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e
cb
e agd ce g d
a
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F1
F2
F3
Page fault?
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process. How many bits are required for the pointer in the process table? Show all your steps.
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following process execution graph:
P6
P2
P7
P1
P3
P4
P5
Use all of the following semaphores in your answer:
s1=0; s2=0; s3=0; s4=0; s5=0; s6=0;
Chapter 9 Solutions
Activities Manual for Programmable Logic Controllers
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