Activities Manual For Programmable Logic Controllers
5th Edition
ISBN: 9781259682476
Author: Frank Petruzella
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 9, Problem 13RQ
Program Plan Intro
Pushbutton:
- It refers to a normal switch process that is used to control some aspects of machine or process.
- Pushbuttons are normally built of hard materials such as plastic or metal.
- Pushbuttons are normally used in calculators, kitchen appliances, and various other
mechanical and electronic devices.
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. Differentiate between continuous and discrete systems. How does their nature affect the selection of simulation techniques?
hi, I need help to resolve the case, thank you
The following table shows the timestamp and actions by two users. Choose the best option that describes the outcome of the actions.
Time JohnSara
10:14 select* from hr.employees;
10:15 Update hr.employees set salary= 100
where employee_id= 206;
10:16 Commit:
Select* from hr.employees;
10:18 Commit:
10:20 Select* from hr.employees;
Commit:
John's query willreturn the same results all three times it is executed as they are run in the same session.
John's queries run at10:16 and10:20 produce the same result, which is different from the one at 10:14
John's query run at 10:16 waits until 10:18 to produce results, waiting for the commit to happen.
John's queries run at 10:14 and 10:16 produce the same result, which is different from the one at 10:20
Chapter 9 Solutions
Activities Manual For Programmable Logic Controllers
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