Study the ladder logic program in the figure below, and answer thequestions that follow: (8 points, 1 point each)a. Under what condition will the latch rung 1 be true?b. Under what conditions will the unlatch rung 2 be true?c. Under what condition will rung 3 be true?d. When PL1 is on, the relay is in what state (latched or unlatched)?e. When PL2 is on, the relay is in what state (latched or unlatched)?f. If AC power is removed and then restored to the circuit, whatpilot light will automatically come on when the power is restored?g. Assume the relay is in its latched state and all three inputs arefalse. What input change(s) must occur for the relay to switch intoits unlatched state?h. If the examine if closed instructions at addresses I/1, I/2, and I/3are all true, what state will the relay remain in (latched orunlatched)?
Criteria analysis is for determining what solution, treatment, or approach is the best one to solve or mitigate a problem or best take advantage of an opportunity. It is an objective, as well as idealistic, approach. Idealistic in that you pretend that your resources are unlimited and that there are no legal or cultural obstacles. With all things being equal, with no concerns with laws, material resources, money, public acceptance, staffing, or time, what would be the best solution? Sometimes criteria analyses are called decision matrices. The feasibility test is where you become pragmatic. As your textbook states, on page 469, “Feasibility is a measure of the practicality of a course of action.”
April 19, 2018
5:35 pm
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