Latching Cercuit (Controlling The motor by pressing Start Stop Button)

Latching Circuit for Motor Control – Ladder Logic Application

Objective:

Control a motor using a momentary Start and Stop push-button setup. Once the motor is turned ON using the Start button, it remains ON until the Stop button is pressed—even if the Start button is released.

Working Principle:

• Start Button (I0.0): When pressed, it activates the motor.

• Latching Logic: Keeps the motor energized using feedback from the output coil (Q0.0), forming a memory loop.

• Stop Button (I0.1): Interrupts the circuit and stops the motor.

I/O Address Mapping

Device	Address
Start Button	I0.0
Stop Button	I0.1
Motor Output	Q0.0

Ladder Logic Program

 Explanation:

• Rung 1 activates Q0.0 (Motor) when:

  • Start (I0.0) is pressed

  • AND Stop (I0.1) is NOT pressed

  • AND Motor output (Q0.0) is held ON through latching

• The latching branch uses the motor’s output (Q0.0) to keep the rung true even after releasing the Start button.

• Pressing the Stop button breaks the rung logic, de-energizing the motor.