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Inst Tools > Blog > PLC Tutorials > PLC Based Product Sorting Machine System – Lift Control

PLC Based Product Sorting Machine System – Lift Control

PLC based product sorting machine system is used to carry different products using the lift to separate the parts based on size.

Last updated: July 4, 2023 11:07 am
Editorial Staff
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In this advanced PLC program, PLC based product sorting machine system is used to carry different products using the lift to separate the parts based on size.

Contents
PLC Based Product Sorting Machine SystemInputs and OutputsProgram DescriptionPLC Logic

Here there are three positions available based on the size like small, medium, and large. The conveyors are used to transfer the products and place them on the trays.

PLC Based Product Sorting Machine System

The below simulation shows the PLC sorting system using the lift operation.

PLC Based Product Sorting Machine System

Inputs and Outputs

TypeDevice No.Device nameOperation
InputX0UpperON when part is detected.
InputX1MiddleON when the lift is at a lower position.
InputX2LowerON when the part is detected.
InputX3Part on liftON when the part is detected.
InputX4Lower lift positionON when the lift is at the middle position.
InputX5Middle lift positionON when the lift is at middle position.
InputX6Upper lift positionON when the part is on the lift.
InputX10SensorON when the part is detected at the left end.
InputX11SensorON when the part is detected at the left end.
InputX12SensorON when the part is detected at the right end.
InputX13SensorON when the part is detected at the left end.
InputX14SensorON when the part is detected at the right end.
InputX15SensorON when the lift is at the upper position.
OutputYOSupply commandOne part is supplied when YO is ON: Metal cylinder repeats in order S, L, M, L, M, S.
OutputY1Conveyor forwardON when the part is detected at the right end.
OutputY2Lift up commandThe lift moves up when Y2 is ON. The lift stops when Y2 is OFF.
OutputY3Lift down commandThe lift moves down when Y3 is ON. The lift stops when Y3 is OFF.
OutputY4Lift rotation commandThe conveyor moves forward when Y1 is ON.
OutputY5Lower conveyor forwardLift rotates to transfer part to conveyor when Y4 is ON.
Lifts rotates back to the original position when Y4 is OFF.
OutputY6Middle conveyor forwardThe conveyor moves forward when Y5 is ON.
OutputY7Upper conveyor forwardThe conveyor moves forward when Y6 is ON.

Program Description

The entire system comprises two components: General Control and Lifter Management.

General Control:

Activating the PB1 (X20) button on the operational panel initiates the Supply command (Y0) for the hopper. Deactivating the PB1 (X20) button turns the Supply command (Y0) off. Upon activation of the Supply command (Y0), the hopper delivers a part.

The conveyors initiate movement when the SW1 (X24) on the control panel is activated. Conversely, the conveyors halt movement when the SW1 (X24) is deactivated.

Upon detecting a part by the sensor X10, X12, or X14 positioned to the left of the conveyor, the corresponding conveyor initiates, transporting the part to the right-end tray. Three seconds post a part passing by the sensor X11, X13, or X15 to the right of the conveyor, the conveyor halts.

Parts of varying sizes (large, medium, small) on the conveyor are sorted by the inputs of the Upper (X0), Middle (X1), and Lower (X2) sensors.

Lifter Management:

Once the Part on the lift sensor (X3) in the lift is activated, the part is transported to one of the following conveyors based on its size:

  • Large part: Directed to the Upper conveyor
  • Medium part: Directed to the Medium conveyor
  • Small part: Directed to the Lower conveyor

The commands for Lifting Up (Y2) and Lifting Down (Y3) are managed based on the lift’s position, detected by the following sensors:

  • Upper: X6
  • Middle: X5
  • Lower: X4

Upon the part’s transfer from the lift to the conveyor, the Lifter Rotation command (Y4) is initiated.

Post the transfer of a part, the lift returns to its initial position and remains on standby.

PLC Logic

PLC Based Product Sorting Machine System
PLC Lift Control

Source: Mitsubishi Electric

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