Programmable Logic Controllers - With Access
5th Edition
ISBN: 9781259933523
Author: Petruzella
Publisher: MCG
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Question
Chapter 7, Problem 6RQ
Program Plan Intro
Programmable Logic Controller (PLC):
- PLC is a specialized computer used in industrial segments to control machines and process.
- PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
- The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
- When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
- The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling
programming language.
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.
Explanation of Solution
b.
Resetting the accumulated count to zero:
- The accumulated count of retentive timers can be reset to zero by using a separate reset signal.
- This separate signal is known as Retentive Timer Reset (RES) instruction.
- When RES is true, the accumulated value of the timer is reset to zero...
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Chapter 7 Solutions
Programmable Logic Controllers - With Access
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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- Make a state diagram and the timing squences as x changesarrow_forwardWrite the equation between the time delay generated by the 8051’s Timer in mode 1 and the initialvalues to be loaded into THx and TLx. Assume XTAL the external frequency is 11.0592MHz.arrow_forwardDraw a ladder logic diagram for the timer scenario shown (draw out the timer delays too) (It's not for a grade stop rejecting it)arrow_forward
- Draw a ladder logic diagram for the timer scenario shown (draw out the timer delays too)arrow_forwardWhat is the resolution of the timing procedure clock() and gettimeofday()?arrow_forwardDraw the state machine for a luggage belt system. The belt is started when the start button is pressed and runs until either the stop button is pressed or until there is no luggage detected on the belt for 60 seconds.arrow_forward
- Draw a ladder logic diagram for the timer scenarios given below. (I've asked you guys PLC questions multiple times please just answer them). IT'S A SOFTWARE QUESTION STOP REJECTING IT.arrow_forwardDraw a ladder logic diagram for the timer scenario shown.arrow_forwardThere are still problems: 1. if we set the time a day earlier which is 1440 minutes, the result is not the same as our input time. 2. If the early wakeup time is the same as the wake-up time in minutes, then the alarm should go off at midnight (00 00 in 24 hr time)arrow_forward
- If the real-time clocks in a group of workstations can drift 15 seconds max per day, how frequently should the clocks be synchronized for each approach to keep them within 2 second of each other using: a) Christian’s Algorithm and b) The Berkeley Algorithm?arrow_forwardWhat is the following situation? In some situations particular input sequences will never occur as inputs to a sequential circuit. In other cases, the output from a sequential circuit is only observed at certain times rather than at every clock time. These situations lead to unspecified next states or outputs in the state table. a. An incompletely specified state table. b. An imperfect state table. c. A partial state table. d. A gapped state table.arrow_forwardAssume we are writing a testbench for a sequential circuit that has three control inputs (cA, cB, cC) and a periodic clock (clk). If we define CLK_PERIOD as a localparameter with a value of 50 (nsec), write the testbench segment that would ensure all possible combinations of the control inputs were tested on a clock rising edge. This is can be done more elegantly if you define each time step in terms of the constant CLK_PERIOD. Your answer should include the statements that define clk, cA, cB, and cC over time. Hint: think of how you would show all combinations of three variables on a truth table and replicate that over time, where each combination is held over a timespan with a clock triggering edge.arrow_forward
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