Solution Manual Programmable Logic Controllers 4th Edition By Frank – Test Bank

CHAPTER 11
Math Instructions

TEST 11 . 2

Place the answers to the following questions in the
answer column at the right. Answer

1. Math instructions enable the programmable controller 1. computer
to take on some of the qualities of a ____ system.

2. The ability of a PLC to perform math functions is 2. False
intended to allow it to replace a calculator.

3. PLC math functions perform arithmetic on ____ stored 3. values
in memory words.

4. The four basic math functions performed by PLCs 4a. addition
are: (a) ____, (b) ____, (c) ____, and ____ (d) . 4b. subtraction
4c. multiplication
4d. division

5. All PLC manufacturers use the same format for 5. False
math instructions. (True or False)

6. The rung of Figure 11-14 is telling the processor to 6a. N7:0 N7:1
add the values stored in words (a) ____ ____ and 6b. N7:2
store the sum in word (b) ____ whenever (c) ____ 6c. A
is true.

Figure 11-14 Logic rung for question 6.

7. The rung of Figure 11-15 is telling the processor to 7a. N7:05
subtract the value stored in word (a) ____ 7b. N7:10
from the value stored in word (b) ____ and store the 7c. N7:20
difference in word (c) ____ .

Figure 11-15 Logic rung for question 7.

8. The rung of Figure 11-16 is telling the processor 8a. N7:8 N7:10
to multiply the values stored in words (a) ____ _____ 8b. N7:2
and store the product in word (b) ____ .

Figure 11-16 Logic rung for question 8.

9. The rung of Figure 11-17 is telling the processor 9a. N7:4
to divide the value of word (a) ____ by the value 9b. N7:6
of word (b) ____and store the quotient in word (c) ____ . 9c. N7:3

Figure 11-17 Logic rung for question 9.

10. The program of Figure 11-18 is telling the processor 10a. N7:5 N7:8
to energize output 0:2/3 whenever the sum of the values 10b. equal to
stored in words (a) ____ ____ is (b) ____or (c) ____ 10c. greater than
the value stored in word (d) ____ . 10d. N7:4

Figure 11-18 Program for question 10.

11. The program of Figure 11-19 is telling the 11a. I:3/7
processor to energize output 0:6/2 whenever (a) ____ is 11b. N7:4 N7:3
true and the difference between the values stored 11c. N7:6
in words (b) ____ ____ is equal to the value stored
in word (c) ____ .

Figure 11-19 Program for question 11.

12. For the program of Figure 11-20, if output 0:5/8 12. 1520
is to be energized when the product of the values stored
in words N7:1 and N7:2 is equal to 1520, then the value
of the number stored in word N7:4 must be ____ .

Figure 11-20 Program for question 12.