Page 35 - Programmable Logic Controllers, Fifth Edition Mobile 2

CHAPTER 1 PROBLEMS

1. Given two single-pole switches, write a program 5. Write a program for the relay ladder diagram
that will turn on an output when both switch A and shown in Figure 1-31.
switch B are closed.
2. Given two single-pole switches, write a program
that will turn on an output when either switch A or 120 VAC
switch B is closed. PB1
3. Given four NO (Normally Open) pushbuttons (A- S1 PS1 TS1 L1
B-C-D), write a program that will turn a lamp on if S2
pushbuttons A and B or C and D are closed. S3
4. Write a program for the relay ladder diagram
shown in Figure 1-30.
Figure 1-31 Circuit for Problem 5.
120 VAC

S1 LS1
L1

LS2

Figure 1-30 Circuit for Problem 4.

16 Chapter 1 Programmable Logic Controllers (PLCs)

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