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Inst Tools > Blog > PLC Tutorials > PLC Program – Controls Conveyors ON and OFF Sequence

PLC Program – Controls Conveyors ON and OFF Sequence

How PLC controls conveyors sequence ? Design a Conveyor belt control using PLC programming with conveyors ON and OFF sequence control logic.

Last updated: November 3, 2023 1:37 pm
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This is a PLC Program for controlling conveyors ON sequence and OFF sequence.

Contents
PLC Controls Conveyors ON and OFF SequenceProblem DiagramProblem SolutionList of inputs & outputsList of inputsList of outputsM memoryPLC control conveyors ON sequence and OFF sequenceProgram ExplainedNetwork 1:Network 2:Network 3:Network 4:Network 5:Network 6:Network 7:Network 8:Network 9:Network 10:Network 11:Result

PLC Controls Conveyors ON and OFF Sequence

Problem Description

There are three belt conveyor in the system. We need to control sequences of conveyors both ON sequence and OFF sequence.

Problem Diagram

PLC Controlling Conveyors ON Sequence and OFF Sequence

Problem Solution

We will use PLC S7-300 for this application. Also we will use TIA portal software for programming.

Conveyor belt 1 or conveyor belt 2 can be started by the corresponding START push buttons and can be stopped by corresponding STOP push buttons.

Conveyor belt 3 should always transport when either conveyor belt 1 or conveyor belt 2 is transporting.

When OFF push button is pressed, belt 1 or belt 2 is to continue running for 20 sec. and belt 3 for 60 seconds to clear the belts of material and Then stopped.

There is 10 Hz. monitoring signal for belt status monitoring for all three belts. If there is fault in any one of the belts then the entire belt should turn off immediately.

And OFF indications of previously running belts should flash with 5 HZ frequency.

List of inputs & outputs

List of inputs

  • System ON/OFF switch :- I2.0
  • Belt 1 START :- I0.0
  • Belt 1 STOP :- I0.1
  • Belt 2 START :- I0.2
  • Belt 2 STOP :- I0.3
  • Belt 1 fault :- I1.0
  • Belt 2 fault :- 1.1
  • Belt 3 fault :- I1.2

List of outputs

  • Conveyor belt 1 :- Q0.0
  • Conveyor belt 2 :- Q0.1
  • Conveyor belt 3 :- Q0.2
  • Belts running indication :- Q0.3
  • Fault indication :- Q0.4
  • Fan 3 ON Indication :- Q0.6
  • Main supply ON indication :- Q0.7

M memory

  • Cycle ON :- M0.0
  • 5HZ clock pulse :- M0.5
  • 10HZ clock pulse :- M1.0

PLC control conveyors ON sequence and OFF sequence

PLC Controls Conveyor
Conveyor belt control using PLC
PLC Conveyor Belt
PLC Conveyor Belt Logic
Conveyor Belt PLC Programming
PLC based Conveyor belt Control
plc conveyor belt project
plc conveyor logic example
conveyor belt ladder diagram
conveyor belt automation using plc
plc based conveyor control system

Program Explained

For this application, we used S7-300 PLC and TIA portal software for programming.

Network 1:

When system ON switch (I2.0) is pressed, cycle ON (M0.0) bit will be ON.

Network 2:

When belt 1 START PB (I0.0) is pressed, Conveyor belt 1(Q0.0) will be ON.

Network 3:

When conveyor belt 1 STOP button (I0.1) is pressed, timer will start to count time and after 20s timer will stop the conveyor belt 1 (Q0.0). If fault occur in conveyor belt 1, belt 1 should be STOP.

Network 4:

When belt 2 START PB (I0.2) is pressed, conveyor belt 2 (Q0.1) will be ON.

Network 5:

When conveyor belt 2 STOP button (I0.3) is pressed, Timer will start to count time and after 20s timer will stop the conveyor belt 2 (Q0.1). If fault occur in conveyor belt 2, belt 2 should be STOP.

Network 6:

Either conveyor belt 1 (Q0.0) or conveyor belt 2 (Q0.1) is ON, Conveyor belt 3 (Q0.2) will be ON. If fault occur in conveyor belt 3, it should be STOP.

Network 7:

When both conveyors are OFF, Conveyor 3 off timer will be executed.

Network 8:

When conveyor belt 3 timer is executed, after 30s it will stop the conveyor belt 3 (Q0.2).

Network 9:

Either conveyor belt 1 STOP PB (I0.1) or conveyor belt 2 STOP PB (I0.3) is pressed, conveyor 1&2 reset timer will be executed.

Network 10:

If three conveyors are running in healthy condition, belts running indication lamp (Q0.3) blinks on 10HZ frequency.

Network 11:

If any conveyor belt is faulty out of three belts, fault indication lamp (Q0.7) will start to blink on 5HZ frequency.

Note :- Above application may be different from actual application. This example is only for explanation purpose only. We can implement this logic in other PLC also. This is the simple concept of conveyor ON and conveyor OFF sequence in industry, we can use this concept in other examples also.

All parameters considered in example are for explanation purpose only, parameters may be different in actual applications. Also all interlocks are not considered in the application.

Result

plc conveyor belt project,

Author: Bhavesh

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1 Comment
  • nathan kamla says:
    November 20, 2022 at 1:26 am

    Sir, error in network 7 repeated output Q0.0 in XIO twice

    Reply

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