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5. Study the ladder logic program in Figure 7-34 on page 198, 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? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is true, and EN is 1, TT is 0, and DN is 1. T4:2 (EN) 1.0 1780 (DN) 0 PL Output 6. You have a machine that cycles on and off during its operation. You need to keep a record of its total run time for maintenance purposes. Which timer would accomplish this? 7. Write a ladder logic program that will turn on a light, PL, 15 s after switch S1 has been turned on. 8. Study the on-delay timer ladder logic program in Figure 7-35, and from each of the conditions stated, determine whether the timer is reset, timing, or timed out or if the conditions stated are not possible. L2

5. Study the ladder logic program in Figure 7-34 on page 198, 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? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is true, and EN is 1, TT is 0, and DN is 1. T4:2 (EN) 1.0 1780 (DN) 0 PL Output 6. You have a machine that cycles on and off during its operation. You need to keep a record of its total run time for maintenance purposes. Which timer would accomplish this? 7. Write a ladder logic program that will turn on a light, PL, 15 s after switch S1 has been turned on. 8. Study the on-delay timer ladder logic program in Figure 7-35, and from each of the conditions stated, determine whether the timer is reset, timing, or timed out or if the conditions stated are not possible. L2

Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter39: Programming A Programmable Logic Controller
Section: Chapter Questions
Problem 7RQ: A PLC requires that times be programmed in 0.1-second intervals. What number should be entered to...
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5. Study the ladder logic program in Figure 7-34 on page 198, 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? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is true, and EN is 1, TT is 0, and DN is 1. T4:2 (EN) 1.0 1780 (DN) 0 PL Output 6. You have a machine that cycles on and off during its operation. You need to keep a record of its total run time for maintenance purposes. Which timer would accomplish this? 7. Write a ladder logic program that will turn on a light, PL, 15 s after switch S1 has been turned on. 8. Study the on-delay timer ladder logic program in Figure 7-35, and from each of the conditions stated, determine whether the timer is reset, timing, or timed out or if the conditions stated are not possible. L2
Transcribed Image Text:5. Study the ladder logic program in Figure 7-34 on page 198, 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? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is true, and EN is 1, TT is 0, and DN is 1. T4:2 (EN) 1.0 1780 (DN) 0 PL Output 6. You have a machine that cycles on and off during its operation. You need to keep a record of its total run time for maintenance purposes. Which timer would accomplish this? 7. Write a ladder logic program that will turn on a light, PL, 15 s after switch S1 has been turned on. 8. Study the on-delay timer ladder logic program in Figure 7-35, and from each of the conditions stated, determine whether the timer is reset, timing, or timed out or if the conditions stated are not possible. L2
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