PLC Automatic Door Control System – Programming Example

This is a PLC Program for an automatic door control system. Learn PLC programming with example problems for students.

Automatic Door Control

Problem Description

Implement logic for the automatic door open & close system in PLC using ladder diagram programming language.

Problem Diagram

Problem Solution

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

In this system when someone enters the infrared sensing field, opening motor starts working to open the door automatically till the door touches the door opening limit switch.

If the door touches the opening limit switch for 8sec and no body enters the sensing field/area, then closing motor starts to close the door automatically till the door touches the closing limit switch.

Stop the closing action immediately if someone enters the sensing field during the door closing process.

List of inputs/outputs

List of inputs

• Infrared sensor :- I0.0
• Closing limit switch :- I0.1
• Opening limit switch :- I0.2

List of outputs

• Opening motor :- Q0.0
• Closing motor :- Q0.1

PLC Programming for Automatic Door Control System

Program Description

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

Network 1:

When infrared sensor is detected (I0.0), door opening motor (Q0.0) will start. The door will be open. When it touches the close limit switch (I0.1), opening motor will be stop.

Network 2:

When the door touches the opening limit switch (I0.2), timer will be executed.

Network 3:

After 8sec time closing motor (Q0.1) will start. When it touches the closing limit switch, closing motor (Q0.1) will turn OFF.

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 automatic door open and close application, 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

Author: Bhavesh

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