Implement the hardwired tank filling and emptying operation

Implement the hardwired tank filling and emptying operation shown in Logix format. The operation of the control circuit can be summarized as follows:

-Assuming the liquid level of the tank is at or below the empty level mark, momentarily pressing the FILL pushbutton will energize control relay 1CR.

-Contacts 1CR₁ and 1CR₂ will both close to seal in the 1CR coil and energize normally closed solenoid valve A to start filling the tank.

-As the tank fills, the normally open empty-level sensor switch closes.

-When the liquid reaches the full level, the normally closed full-level sensor switch opens to open the circuit to the 1CR relay coil and switch solenoid valve A to its de-energized closed state.

-Anytime the liquid level of the tank is above the empty-level mark, momentarily pressing the EMPTY pushbutton will energize control relay 2CR.

-Contacts 2CR₁ and 2CR₂ will both close to seal in the 2CR coil and energize normally closed solenoid valve B to start emptying the tank.

-When the liquid reaches the empty level, the normally open empty-level sensor switch opens to open the circuit to the 2CR relay coil and switch solenoid valve B to its de-energized closed state.

-The stop button may be pressed at any time to halt the process.

Solenoid A Full tank sensor L1 L2 Fill Stop 1CR 1CR1 Full tank senso 1CR2 Solenoid A Empty tank Empty tank sensor sensor Empty Control panel eX 2CR Stop Fill e Empty Solenoid EB 2CR1 Empty 2CR2 Solenoid B

Solution

The sequence of operation to implement the process follows:

1) Normally open start and normally closed stop pushbuttons are used to start and stop process.

2) When the start button is pressed,solenoid A energizes to start filling the tank.

3) As the tank fills,the empty level sensor swicth closes.

4) When the tank is full,the full level sensor swicth closes.

5) Solenoid A is de-energized.

6) Agitate motor starts automatically and runs for 3 min to mix the liquid.

7) When the agitate motor stops,solenoid B is energized to empty the tank.

8) When the tank is completely empty,the empty sensor swicth opens to de-energize solenoid B.

9) The start button is pressed to repeate the sequence.