Question

use logo! plc program

ladder program

Water process Tank Write a program to implement the process ilustrated in the Figure shown. The sequence of operation is to be as follows: Normally open start and normally closed stop pushbuttons 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 agitator motor starts automatically and runs for 3 min SOL A to mix the liquid. Motor .This process is repeated three times. After the third time, 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. Ful Empty Startstop coo station

Answer 1

Answer:-

According to the given figure,

Motor Full sensor switch Empty sensor switch ← SOLB Start/stop control station

Tags are created for different areas and controller for different purposes. Two pushbuttons have been considered to start and stop the process. Full level sensor switch is used to indicate the maximum level of the tank and it gets closed when the tank level is full. Empty level sensor switch is used to indicate the tank is empty and it gets closed as soon as the tank starts filling. Solenoid A and B are used to fill and empty the tank respectively. In rung 1, when the start button is pressed and full level sensor switch is not closed then solenoid A is energized to start filling the tank. In order to keep solenoid A ON even though the start push button is released , a parallel path with a normally open switch having address similar to the solenoid A is connected. As soon as the tank is completely filled, fill level sensor is activated, de-energizing the solenoid A. As the solenoid A switch makes a true to false transition, the timing bit of the timer T4 gets energized and it remains ON till the accumulated time equals the preset time. The timing bit of the timer T4 energized the Agitate motor and it runs for 3 minutes. The Agitate motor remains ON for 3 minutes as the preset value of the timer is changed to 180 for a time base of 1 second. The Agitate motor stops mixing the liquid as the timing bit of the timer T4 gets de-energized after 3 minutes. In rung 4, as the timing bit of the timer is made zero and the empty level sensor switch remains closed, the selenoid B . Finally the start button is pressed again to repeat the process. Hence the mixing process is controlled using ladder program.

I LAD 2 0:2/2 B3:0/0 Process start B3:00 Process start Rung to energizes Solenoid A I:3V0 001 B3:0/0 0:2/0 Process start Empty level se Full level sensor 0:2/0 Rung to run Agitate motor for 3 min 002 TON Timer On Delay Timer Time Base Preset Accum T4:0 1800 114 0:2/1 003 Agitate motor Rung to energizes Solenod B 004 T4:0/DN :3/0 0:2/2 Empty level sensor Rung to Count system restart 005 1/0 TU Count Up С5:0 Preset Accum 006 END