Study the ladder logic program in Figure 7-43 and answer the questions that follow:
a. What is the purpose of interconnecting the two timers?
b. How much time must elapse before output PL is energized?
c. What two conditions must be satisfied for timer T4:2 to start timing?
d. Assume that output PL is on and power to the system is lost. When power is restored, what will the status of this output be?
e. When input PB2 is on, what will happen?
f. When input PB1 is on, how much accumulated time must elapse before rung 3 will be true?
