In recent times, automation has taken boom all over the world and it looks impossible to live without automated things. We can see automated things in our daily life. Automatic door open and close is also one of the automated things in the world. We can see automatic door opening and closing systems in corporate offices, malls, elevators, etc.
Automatic Door Open and Close system
The main working principle of automatic door open and close is to sense an object next to the door with the help of sensors and give this input to the PLC for the opening and closing operation of the door.
The biggest advantage of an automatic door open and close system is that there is no requirement of any supervision for its operation.
List of Input Outputs
|I0.2||Object Detecting Sensor (S)||Input|
|I0.3||Limit Switch 2 (LS2)||Input|
|I0.4||Limit Switch 1 (LS1)||Input|
PLC Program and Explanation
The complete program is divided into two networks, network 1 and network 2. Don’t be afraid, you can divide a program into as many networks as you want.
Network 1 is used to Start and Stop the system, and Network 2 is used for the door open and close ladder program.
The system is started and stopped using the switches.
If you want to start and stop the system using a single push button only, then you can refer to the following article, Single Push Button Start/Stop Ladder Logic Diagram
When the object detection sensor senses an object or people, it will open the door by a mechanism until Limit Switch 2 (LS2) is turned ON.
When there is no object in front of the object detection sensor and the door is open, the door will be closed with the help of a mechanism.
Before closing the door timer of 10 seconds is counted.
While closing the door, if the object detecting sensor senses an object, the closing of the door will immediately stop and the door will open again.