Page 270 - Programmable Logic Controllers, Fifth Edition - Mobile version

L1 Input Ladder logic program Output L2 10. With reference to the math instruction program
shown in Figure 11-41, when the input goes
Fahrenheit
Celsius MUL true, what value will be stored at each of the
1 MULTIPLY following?
Source A I:012
2 I:012 O:013 a. N7:3
Source B 9
3 b. N7:4
Thumbwheel Destination N7:0 LED c. N7:5
switch Display d. N7:6
DIV
DIVIDE 11. Two part conveyor lines, A and B, feed a main
Source A N7:0
conveyor line, M. A third conveyor line, R,
Source B 5 removes rejected parts a short distance away from
Destination N7:1 the main conveyor. Conveyors A, B, and R have
parts counters connected to them. Construct a PLC
ADD
ADD program to obtain the total parts output of main
Source A N7:1 conveyor M.
Source B 32 12. A main conveyor has two conveyors, A and B,
Destination O:013 feeding it. Feeder conveyor A puts six-packs of
canned soda on the main conveyor. Feeder con-
Figure 11-39 Program for Problem 4. veyor B puts eight-packs of canned soda on the
main conveyor. Both feeder conveyors have coun-
ters that count the number of packs leaving them.
9. With reference to math instruction program shown Construct a PLC program to give a total can count
in Figure 11-40, when the input goes true, what on the main conveyor.
value will be stored at each of the following?
a. N7:3
b. N7:5
c. F8:1
Input
SUB
SUBTRACT
Input Source A N7:1
ADD 80
Source B N7:2
20
ADD Destination N7:3
Source A N7:1
208
Source B N7:2 MUL
114 MULTIPLY
Destination N7:3 Source A N7:3
MUL Source B 2
Destination N7:4
MULTIPLY
Source A N7:3
ADD
Source B N7:4 ADD
4 Source A N7:4
Destination N7:5
Source B 24
DIV
Destination N7:5
DIVIDE SQR
Source A N7:5
SQUARE ROOT
Source N7:5
Source B 5.000000
Destination N7:6
Destination F8:1
Figure 11-40 Program for Problem 9. Figure 11-41 Program for Problem 10.

Math Instructions Chapter 11 251

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