Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5, Problem 13RQ
Answer the following with regard to the Examine If Open instruction:
- a. What is another common name for this instruction?
- b. What is this instruction asking the processor to examine?
- c. Under what condition is the status bit associated with this instruction 0?
- d. Under what condition is the status bit associated with this instruction 1?
- e. Under what condition is this instruction logically true?
- f. What state does this instruction assume when it is false?
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Execute the following instruction using all previous instruction format types
1. Study this program , then answer the questions that follow :
MOV AL, 64H
ADD AL,27H
DAA
a) What does the accumulator contain immediately after the ADD instruction is executed ?
What do the CY and AC flags contain?
b) What does the accumulator contain after the DAA instruction is executed? What do the
CY and AC flags contain?
2. Write a subroutine that will perform the function of the DAA instruction.
In an instruction cycle the execute phase includes
Select one:
a.the operation of the decoded instruction on all the operands.
b.there is no correct answer here
c.incrementing the program counter by 2 addresses.
d.the step of decoding the instruction for execution.
e.the transfer of the content of memory address pointed by the program counter.
Chapter 5 Solutions
Programmable Logic Controllers
Ch. 5 - What does the memory map for a typical PLC...Ch. 5 - Compare the function of the PLC program and data...Ch. 5 - Prob. 3RQCh. 5 - Prob. 4RQCh. 5 - a. What information is stored in the input image...Ch. 5 - a. What information is stored in the output image...Ch. 5 - Prob. 7RQCh. 5 - List four factors that enter into the length of...Ch. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Answer the following with regard to the Examine If...Ch. 5 - Answer the following with regard to the Examine If...Ch. 5 - Answer the following with regard to the Output...Ch. 5 - A normally closed pushbutton is connected to a PLC...Ch. 5 - Prob. 16RQCh. 5 - Prob. 17RQCh. 5 - Prob. 18RQCh. 5 - Prob. 19RQCh. 5 - Prob. 20RQCh. 5 - Prob. 21RQCh. 5 - Explain the purpose of Windows based programming...Ch. 5 - Prob. 23RQCh. 5 - Prob. 24RQCh. 5 - Prob. 25RQCh. 5 - Prob. 26RQCh. 5 - Assign each of the following discrete input and...Ch. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Redraw the program shown in Figure 5-57 corrected...Ch. 5 - Redraw the program shown in Figure 5-58 corrected...Ch. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8PCh. 5 - Write the ladder logic program needed to implement...
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