PLC Conveyor Motor Ladder Logic

PLC Programming Tutorials for PLC Conveyor Motor Ladder Logic or Conveyor Belt Control using a programmable logic controller (PLC).

PLC Conveyor Motor Ladder Logic

Objective: The sequential tasks as follows

1. When START button pressed
2. Motor will be started
3. RUN (Green Lamp) indication lamp will be activated
4. Motor Running, so Box will start Move
5. Proximity Sensor will detect when the box arrives at other end
6. Motor will be stopped
7. RUN (Green Lamp) indication lamp will be de-activated
8. STOP (Red Lamp) indication lamp will be activated
9. An Emergency Stop push button will be used to stop the motor at any time.

Relay Schematic

• R : STOP Indication lamp,
• G : RUN Indication lamp,
• M : Motor,
• OL : Overload Relay (Motor Protection Relay),
• LS1 : Proximity Switch,
• PB1 : Start push button,
• PB2 : Emergency Stop Pushbutton,
• CR : Contractor Relay

Operational Sequence

• Start button is actuated.
• CR1-1 closes to seal in CR1 or to latch the start command
• CR1-2 opens, switching the red stop pilot light off
• CR1-3 closes, switching the green run pilot light on
• CR1-4 closes to energize the motor starter and motor
• The box/package moves, and proximity switch (LS1) detects the box when it reached and de-energize coil CR1
• CR1-1 opens to open the seal-in contact ( unlatched start command)
• CR1-2 closes, switching the red pilot light on
• CR1-3 opens, switching the green pilot light off
• CR1-4 opens to de-energize the starter coil, stop the motor, and end the sequence

PLC Ladder Logic

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