• 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 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. SOL A Motor Full sensor switch Empty sensor switch - SOL B Start/stop control station

Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter3: Magnetic Starters
Section: Chapter Questions
Problem 16SQ
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Write PLC to execute this.

• 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 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.
SOL A
Motor
Full
sensor
switch
Empty
sensor
switch
- SOL B
Start/stop
control station
Allocations:
Symbol
Address
Field Device
ESTOP
10.0
N.C. momentary contact pushbutton
START
10.1
N.O. momentary contact pushbutton
EMPTY
10.2
N.O. Level sensor
FULL
10.3
N.O. Level sensor
MOTOR
Q0.0
Motor starter
SOL_A
Q0.1
Solenoid valve
SOL_B
Q0.2
Solenoid valve
Transcribed Image Text:• 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 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. SOL A Motor Full sensor switch Empty sensor switch - SOL B Start/stop control station Allocations: Symbol Address Field Device ESTOP 10.0 N.C. momentary contact pushbutton START 10.1 N.O. momentary contact pushbutton EMPTY 10.2 N.O. Level sensor FULL 10.3 N.O. Level sensor MOTOR Q0.0 Motor starter SOL_A Q0.1 Solenoid valve SOL_B Q0.2 Solenoid valve
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