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Inst Tools > Blog > PLC Tutorials > PLC Program for Paint Spraying

PLC Program for Paint Spraying

Design automatic spray painting of objects which are moving on the conveyor using PLC ladder diagram.

Last updated: November 3, 2023 2:54 pm
Editorial Staff
PLC Tutorials
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PLC Program to control paint spraying of objects.

Contents
PLC Program for Paint SprayingProblem DiagramProblem solutionList of Inputs and OutputsPLC Ladder Diagram for Paint SprayingProgram Description

PLC Program for Paint Spraying

Problem Description

Design automatic spray painting of objects which are moving on the conveyor using PLC ladder diagram.

Problem Diagram

PLC Program Paint Spraying

Problem solution

  • Spray painting is mostly used in automobile industries.
  • This method is similar to bottle capping process in food beverage plant.
  • Two proximity sensors are used in this applications.
  • One to detect hanger and other is for parts / objects.
  • Bit shift register is used to spray parts.
  • Oven is used to dry the parts after they are sprayed and this output is continuously ON.

Also Read : PLC Program for Automatic Heating & Mixing of Products

List of Inputs and Outputs

Inputs List

  • START PB :- I0.0
  • STOP PB :- I0.1
  • Part detector :- I0.3
  • Hangar detector :- I0.2

Outputs List

  • Master coil :- Q0.0
  • Oven :- Q0.1
  • Spray :- Q0.2

Memory

  • Relay coil :- M11.0
  • Shift register :- MW10

PLC Ladder Diagram for Paint Spraying

Spray Painting PLC Ladder Logic

Program Description

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

Network 1:

When START PB (I0.0) pressed master coil (Q0.0) will be ON and it can be stopped by pressing STOP PB (I0.1).

Network 2:

When master coil is ON, oven (Q0.1) will start.

Network 3:

When part is detected, relay coil will be set for logic purpose. And it will set the first bit of MW10.

Network 4:

Here we used bit shift register so after detection of part it will count hanger detection and after. Here assume distance of spray from part detector proximity is 3 steps. So as per shift register logic M10.2 will be ON after 3 steps.

Network 5:

When M10.2 is ON, spray will be activated.

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 spray painting of parts in industries, we can use this concept in other examples also.

All parameters and graphical representations considered in this example are for explanation purpose only, parameters or representation may be different in actual applications. Also all interlocks are not considered in the application.

Also Read : PLC Program for Conveyor System

Author: Bhavesh

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1 Comment
  • ferhat says:
    June 25, 2023 at 3:25 am

    formidable leçon merci de votre part

    Reply

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