TIA Portal: Automatic Door Opener Program

This article discusses the PLC program for the Automatic Door Opener system using TIA Portal software. The system is designed to detect the presence of approaching humans or other objects, then automatically open the door to allow them through. After an object passes, the door will close again automatically. Apart from that, this system also has a feature that allows it to hold the door open.

Contents

Program Objective

Automatic Door Opening System Steps:

Initialization: System is ready to operate, door is closed.
Detection: The sensor detects an approaching object.
Open Door: The motor moves the door until it is fully opened.
Hold: The door remains open briefly for 4 seconds.
Close Door: The motor moves the door until it is fully closed.
Hold Mode: The door will remain Open if the Selector Switch is set in “HOLD” mode.
Repeat: Return to step 2 for the next detection.

This system has a sensor to detect objects and a limit switch to limit door opening/closing movements.

Automatic Door Opener Program

I/O Details

S.No.	Comment	Input (I)	Output(Q)	Memory Bits	Timer
	MOTOR_SLIDER_OPEN		Q0.0
	MOTOR_SLIDER_CLOSE		Q0.1
	HOLD_SWITCH	I0.5
	LS_DOOR_CLOSE	I0.4
	LS_DOOR_OPEN	I0.3
	OBJECT_SENS	I0.2
	STOP	I0.1
	START	I0.0
	SYSTEM_ON			M0.0
	HOLD_DOOR			M0.1
	IR_TIMER			M0.2
	TIMER_OPEN				DB1

TIA Portal

NETWORK 1 : (START SYSTEM)

In this network, when the START (I0.0) button is Pressed, the memory bit SYSTEM_ON (M0.0) will be in the HIGH state. Because it uses Latching, even though the START (I0.0) button has been released the memory bit SYSTEM_ON (M0.0) will remain in the HIGH state.

If the STOP (I0.1) button is Pressed, the memory bit SYSTEM_ON (M0.0) will be in the LOW state.

NETWORK 2 : (HOLD THE DOOR)

In this network, if the NO contact of the Selector Switch HOLD_SWITCH (I0.5) and the memory bit SYSTEM_ON (M0.0) are in the HIGH state, then the memory bit HOLD_DOOR (M0.1) will be in the HIGH state.

Motion sensor based door control with PLC

NETWORK 3 : (DOOR OPEN)

In this Network, the MOTOR_SLIDER_OPEN (Q0.0) output will be ON if the NO contact of the memory bit SYSTEM_ON (M0.0) and the sensor OBJECT_SENS (I0.2) are in the HIGH state. Because it uses Latching, the MOTOR_SLIDER_OPEN (Q0.0) output will remain in the ON state even though the NO contact of the sensor OBJECT_SENS (I0.2) is in the LOW state.

Or, the MOTOR_SLIDER_OPEN (Q0.0) output will be ON if the NO contact of the memory bit HOLD_DOOR (M0.1) is in the HIGH state.

The MOTOR_SLIDER_OPEN (Q0.0) output will be OFF when the NC contact of the Limit Switch LS_DOOR_OPEN (I0.3) is in the HIGH state.

TIA Portal ladder logic for automatic door

NETWORKS 4

The TIMER_OPEN (DB1) timer will start counting when the NO contact of the memory bit SYSTEM_ON (M0.0) and the Limit Switch LS_DOOR_OPEN (I0.3) are in the HIGH state. The timer TIMER_OPEN (DB1) will count to 4 seconds.

When the timer TIMER_OPEN (DB1) has finished counting, the memory bit IR_TIMER (M0.2) will be in the HIGH state.

If the NC contact of the memory bit HOLD_DOOR (M0.1) is in the HIGH state, then the timer TIMER_OPEN (DB1) will be reset.

NETWORK 5 (DOOR CLOSE)

The MOTOR_SLIDER_CLOSE (Q0.1) output will be ON when the NO contacts of the memory bits SYSTEM_ON (M0.0) and IR_TIMER (M0.2) are in the HIGH state. Because it uses Latching, the MOTOR_SLIDER_CLOSE (Q0.1) output will remain in the ON state even though the NO contact of the memory bit IR_TIMER (M0.2) is in the LOW state.

When the NC contact of the Limit Switch LS_DOOR_CLOSE (Q0.1) is in the HIGH state, the MOTOR_SLIDER_CLOSE (Q0.1) output will be OFF.

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