Activities Manual for Programmable Logic Controllers

5th Edition

ISBN: 9781259679568

Author: Petruzella, Frank

Publisher: MCGRAW-HILL HIGHER EDUCATION

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Textbook Question

Chapter 5, Problem 12RQ

Answer the following with regard to the Examine If Closed 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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Chapter 5, Problem 11RQ

Chapter 5, Problem 13RQ

Students have asked these similar questions

7. For both of the instructions shown below, the initial conditions are shown. The result (which the instruction stores in r1) is also shown. For each instruction, answer these questions: • What is the state of the flags (NZCV) after the instruction executes • If the operands were signed, are the results valid? Why or why not? • If the operands were unsigned, are the results valid? Why or why not? a) initial conditions: r0 = 0xAAAA_AAAA rl=0x5555_5555 ADDS rl,rl,ro Result: r1=0xFFFF_FFFF b) initial conditions: r0=0x7FFF_FFFD r1 = 0x0000_000F ADDS rl,ro,r1 Result: r1=0x8000_000C

Execute the following instruction using all previous instruction format types

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.