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Inst Tools > Blog > PLC Tutorials > PLC Program to Heat and Bend Glass Tubes

PLC Program to Heat and Bend Glass Tubes

PLC Program to Heat and Bend Glass Tubes : Glass industry, heated glass tubes are passing in a process line having a particular length which are to be bent.

Last updated: November 3, 2023 2:46 pm
Editorial Staff
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This is a PLC Program for heating and bending glass tubes.

Contents
Heat and Bend Glass TubesProblem DiagramProblem SolutionList of Inputs and OutputsPLC Ladder Logic to heat and bend glass tubesLogic Description

Heat and Bend Glass Tubes

Problem Description

  • In glass industry heated glass tubes are passing in a process line having a particular length which are to be bent.
  • We need to bend glass tube in U-shape. These bended glass tube is used for fluorescent bulbs.
  • Implement this process in PLC using ladder diagram programming language.

Problem Diagram

PLC Program to Heat and Bend Glass Tubes

Problem Solution

For this process, we will consider two pneumatic rods that force the glass tube through metal support for the bending process.

During this process metal support is continuously heated so that glass does not break while bending.

When the bending process is completed, two cutters are used to cut the bent glass.

Proximity switch detects the length to be cut by the cutter in the cutting process.

Metal supports are mounted close to each other so the bending rod and glass tube can pass through it.

List of Inputs and Outputs

Inputs List 

  • START PB :- I0.0
  • STOP PB :- I0.2
  • Glass detector :- I0.3
  • Glass length detector (proximity) :- I0.6

Outputs List 

  • Bend valve :- Q0.0
  • Cutter :- Q0.2
  • Return valve :- Q0.3

M memory 

  • Master coil :- M0.0
  • Relay coil 1:- M0.1

PLC Ladder Logic to heat and bend glass tubes

PLC Ladder Logic heat and bend glass tubes
PLC Glass Tube
PLC Heat Bend Glass
PLC Bend Glass
PLC Heat Glass
Heat and Bend Glass Tube

Logic Description

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

Network 1:

Master coil will be ON (M0.0) when START PB (I0.0) will be pressed and master coil can be stopped by pressing STOP PB (I0.2).

Network 2:

When glass detector sensor (I0.3) detects the glass, bending process will be ON or bend vale (Q0.0) will be ON.

Network 3:

When glass length sensor is detected (I0.6), relay coil 1(M0.1) will be ON for next command.

Network 4:

If relay coil 1(M0.1) is ON, cutter (Q0.2) will be ON

Network 5:

Timer will start to count time when relay coil 1 (M0.1) is ON after 20sec delay (here we assumed time for cutting) cutter (Q0.2) will turn OFF.

Network 6:

When cutter output is ON (Q0.2) and bend valve (Q0.0) is OFF, return valve (Q0.3) will be ON.

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 heating and bending of glass tube 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.

Author: Bhavesh

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1 Comment
  • Gnana Moorthy says:
    October 28, 2018 at 7:01 pm

    I/O addressing mismatching as per you description and ladder diagram . Please correct it.

    Reply

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