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Inst Tools > Blog > PLC Tutorials > Smart Automation Solutions: PLC Logic for Stairway Lighting

Smart Automation Solutions: PLC Logic for Stairway Lighting

Implement smart home automation solutions using PLC logic for stairway lighting control with the help of sensors.

Last updated: May 2, 2024 12:30 pm
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Implement smart home automation solutions using PLC logic for stairway lighting control with the help of sensors.

Contents
Stairway LightingHome Automation SolutionsInputs and OutputsPLC LogicProgram DescriptionPLC Code Testing

Disclaimer: This PLC programming example is for educational purposes only and is provided to study the ladder logic with simple applications.

Stairway Lighting

Problem Statement:

Design a PLC ladder logic for the following application.

We are using three sensors to control 3 Lights. There is one sensor in each place, there are three places so we need 3 sensors. The sensor will detect if there is any presence of a person in the respective place.

The Light on each step (or place) of the stair should remain ON for 10 seconds after the last detected movement.

Home Automation Solutions

This video helps you to implement smart automation for your home application using sensors and lights.

Inputs and Outputs

Digital Inputs:

Sensor 1: I0.0

Sensor 2: I0.1

Sensor 3: I0.2

Digital Outputs:

Light 1: Q0.0

Light 2: Q0.1

Light 3: Q0.2

PLC Logic

PLC Logic for Stairway Lighting

Program Description

We have used Normally Open Contact for Sensor 1(I0.0), Sensor 2 (I0.1), and Sensor 3 (I0.2).

In Rung 0:

  1. Normally Open Contact is used for Sensor 1 (I0.0) to Turn ON the output  Light 1 (Q0.0).
  2. Timer TOF is used to delay the turn-OFF time of the output Light 1 (Q0.0) for some time.

In Rung 1:

  1. Normally Open Contact is used for Sensor 2 (I0.1) to Turn ON the output  Light 2 (Q0.1).
  2. Timer TOF is used to delay the turn-OFF time of the output Light 2 (Q0.1) for some time.

In Rung 2:

  1. Normally Open Contact is used for Sensor 3 (I0.2) to Turn ON the output  Light 3 (Q0.2).
  2. Timer TOF is used to delay the turn-OFF time of the output Light 3 (Q0.2) for some time.

PLC Code Testing

Let’s test our PLC code with the simulation of different input statuses. We may show only the required part of the logic or rung instead of the complete program. We recommend you watch the above video for full details.

Rung 0:

Automated Stairwell Lighting System

When Sensor 1 (I0.0) gets activated, the output Light 1 (Q0.0) will turn ON as Normally Open Contact is used for Sensor 1 (I0.0) and the signal will flow through it.

Sensor-Controlled Staircase Illumination

When Sensor 1 (I0.0) turns OFF, the output Light 1 (Q0.0) remains ON but for a limited time because Timer Function Block type TOF is used to delay the turning OFF time of the output Light 1 (Q0.0) and time is set to 10 seconds.

After 10 seconds, the output Light 1 (Q0.0) will turn OFF.

Stair Lighting Solution

Rung 1:

Smart Sensor-Activated Stair Lights

The output Light 2 (Q0.1) will turn ON, when sensor 2 (I0.1) gets activated.

Motion-Sensing Stairway Lights

When Sensor 2 (I0.1) turns OFF, the output Light 2 (Q0.1) remains ON but for a limited time because Timer Function Block type TOF is used to delay the turning OFF time of the output Light 2 (Q0.1) and time is set to 10 seconds.

After 10 seconds, the output Light 2 (Q0.1) will turn OFF.

PLC Stair Light Automation

Rung 2:

PLC-Programmed Stair Lighting Automation

When Sensor 3 (I0.2) gets activated, the output Light 3 (Q0.2) will turn ON as Normally Open Contact is used for Sensor 3 (I0.2) and the signal will flow through it.

Programmable Logic Controller Staircase Lights

When Sensor 3 (I0.2) turns OFF, the output Light 3 (Q0.2) remains ON but for a limited time because Timer Function Block type TOF is used to delay the turning OFF time of the output Light 3 (Q0.2) and time is set to 10 seconds.

After 10 seconds, the output Light 3 (Q0.2) will turn OFF.

Automation of Stair Lights using PLC Logic

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Read Next:

  • Ladder Diagram Control using Timers
  • PLC Examples on Industrial Automation
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