Write a program to implement the process illustrated in Figure. The sequence of

Question

Write a program to implement the process illustrated in Figure. The sequence of operation is to be as follows: Normally open start and normally closed stop push buttons are used to start and stop the process When the start button is pressed, solenoid A energizes to start filling the tank. As the tank fills, the empty level sensor switch closes. When the tank is full, the full level sensor switch closes. Solenoid A is de energized. The agitate motor starts automatically and runs for 3 min to mix the liquid. When the agitate motor stops, solenoid B is energized to empty the tank. When the tank is completely empty, the empty sensor switch opens to de-energize solenoid B. The start button is pressed to repeat the sequence Study the ladder logic program in Figure and answer the questions that follow: 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, what pilot light will automatically come on when the power is restored?

Explanation / Answer

When inputs I/1, I/2 is closed and I/3 is open, first condition is satisfied. When I/3 is closed, second condition is satisfied. When I/3 is closed, third condition is satisfied. Relay is in latched state Relay is in unlatched state. PL2 will be on as the relay will be in unlatched state.

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