A- W =- Paragraph AaBbCcD AaBbCcD AaBbC A Normal 1 No Spac... Heading 1 H Questions: 1. Name four pieces of data associated with PLC timers. 2. What is the difference between a Non-retentive and a retentive timer? 3. Which time of timer requires a reset? 4. How is a reset associated with a timer? 45. What is the name of a group of timers where each actives the next, and the last one resets the first. Problems 1. You have a machine that cycles on and off during its operation. You need to keep record of it total run time for maintenance purposes. Which would accomplish this? 2. What is the minimum timers were be needed to create a program that control four way traffic light system, were the is a all red state between the changing of directions? 3. Same as 2 but without the all red state. 4. Study the ladder logic program in Figure 7-42 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? N E 1 Normal 1 No Spac... Heading Paragraph E P82 Ladder logic program Output L2 T4:1 L1 Inputs P81 (RES T42 (RES) PL T41 (EN) 1.0 2900 ON) PB2 RTO PB1 RETENTIVE TIMER ON Timer Time base Prosot Accumulated RTO- PB1 T4:1 H Timer DN Time base Preset Accumulated 742 RETENTIVE TIMER ON Figure 7.42 Ladder logic program for Problem 6. T42 (EN) 1.0 1780 ° (ON) PL о N