PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Expert Solution & Answer
Chapter 6, Problem 1RQ
Explanation of Solution
Principle of an electromagnetic control relay:
- The working of an electromagnetic control relay is based on the principle of magnetic induction.
- It consists of an electromagnet or coil to switch contacts.
- When the coil is energized, the movable contacts in between the fixed contacts will swing and come in contact with the bottom fixed contact.
- This results in passing current through the coil of the relay.
- On the other hand, if the coil is de-energized, then the movable contact will be detached from the fixed contact and acts as an open circuit.
- Hence, no current will be passed through the relay.
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2. Signed Integers
Unsigned binary numbers work for natural numbers, but many calculations use negative
numbers as well. To deal with this, a number of different methods have been used to represent
signed numbers, but we will focus on two's complement, as it is the standard solution for
representing signed integers.
2.1 Two's complement
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-2
two's complement number can be written as: Σ2 2¹ di 2n-1 dn
• Otherwise exactly the same as unsigned integers.
i=0
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or 1 becomes 0) and then add 1 to the least significant bit.
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Chapter 6 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
Ch. 6 - Prob. 1RQCh. 6 - Prob. 2RQCh. 6 - Prob. 3RQCh. 6 - Prob. 4RQCh. 6 - Prob. 5RQCh. 6 - Prob. 6RQCh. 6 - Prob. 7RQCh. 6 - Prob. 8RQCh. 6 - What do the abbreviations NO and NC represent when...Ch. 6 - Prob. 10RQ
Ch. 6 - Prob. 11RQCh. 6 - Prob. 12RQCh. 6 - Compare the operation of a photovoltaic solar cell...Ch. 6 - What are the two basic components of a...Ch. 6 - Prob. 15RQCh. 6 - Give an explanation of how a scanner and a decoder...Ch. 6 - Prob. 17RQCh. 6 - Prob. 18RQCh. 6 - Prob. 19RQCh. 6 - Prob. 20RQCh. 6 - Prob. 21RQCh. 6 - Prob. 22RQCh. 6 - Prob. 23RQCh. 6 - Prob. 24RQCh. 6 - Prob. 25RQCh. 6 - Prob. 26RQCh. 6 - Prob. 27RQCh. 6 - Prob. 28RQCh. 6 - Prob. 29RQCh. 6 - Prob. 30RQCh. 6 - Prob. 31RQCh. 6 - Prob. 32RQCh. 6 - Prob. 33RQCh. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Design a PLC program and prepare a typical I/O...Ch. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8P
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