Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 7, Problem 8RQ
Program Plan Intro
Timer:
- Timer is mainly used to keep an output ON for a specific length of time.
- It provides a preset delay to the control actions.
- In a timer, the output will be energized when the preset value becomes equal to the accumulated value.
- Three different types of timers include Delay-OFF timer, Delay-ON timer and Delay-ON-Retentive timer.
Timer On Delay (TON):
- TON refers to an on-delay timer.
- The on-delay timer is the most commonly used timer.
- TON counts the time-based intervals as soon as the instruction becomes true.
- Here, the output changes its state from low to high when the timer provides time delay (instruction goes from OFF to ON state).
Explanation of Solution
b.
Timer-timing bit of a timer instruction:
- When the accumulated value of a timer changes, the timer-timing bit becomes true.
- The accumulated value refers to the current delay of the timer.
- The timer instruction becomes true when the control line of the timer is energized by the power s...
Explanation of Solution
c.
Done bit of a timer:
- The accumulated value refers to the current delay of the timer.
- The preset value refers to the delay period of the timer...
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Chapter 7 Solutions
Activities Manual for Programmable Logic Controllers
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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- A programmer needs to design a delay using the attached snippet of code. If the Clock frequency supported from oscillator is 1 MHz then after executing this code how long will be the period of this delay.(Note that the previous value of counter1 is D'250') dell nop 31 суcle ;1 cycle 2 cycle decfsz counter1,f goto dell Select one: O a. 4 sec b. None of the answers.- C. 5 msec O d. 4 msec О е.4 useсarrow_forwardWhat would cause the current instruction to be reset if there was a problem?arrow_forwardComputer Science - Assembly language code: Q1. A) A microprocessor is wired into a sensing control circuit so that the memory locations 42 and 43 each contain the values 0 or 1. Memory location 50 is connected to a light switch. When the value in 50 is 1 the light is on and when it is 0 the light is off. Write a program to switch on the light on when the values in locations 42 and 43 are both 1, and to switch off the light when the values in locations 42 and 43 are both 0. Only use the ARM assembly language instructions, MOV, JMP and JNZ. Assume that the MOV instruction updates the flags with the status register.arrow_forward
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