Home » PLC Program for Alarm Security System
PLC Tutorials

PLC Program for Alarm Security System

Alarm Security System

This is PLC Program for Alarm Security System.

Problem Description

Make burglar alarm system program in S7-1200 PLC for the house.

Consider one house, in this we want to arrange automatic burglar alarm security system. Alarm should be ON when any person will be detected by the motion sensor.

Problem Diagram

PLC Program for Burglar Alarm Security System

Problem Solution

  • We can solve this problem by using simple logic. Here we can use two sensors, one motion sensor and second window sensor. Window sensor is the loop of wires.
  • The motion sensor is designed such that when person is detected in a house or room, then the sensor will be activated (change its state to 1 or true)
  • Here important point in window sensor is that current is always passing until the breakage occurs in the glass. Hence output always true and when someone will try to break the window glass, current will not flow in the circuit.

List of Inputs/Outputs

Inputs List

  • System START :- I0.0
  • System STOP :- I0.1
  • Motion detector :- I0.2
  • Window sensor :- I0.3
  • Alarm stop button :- I0.4

Outputs List

  • Alarm :- Q0.0

M Memory

  • M0.0 :- Master coil.
  • M0.1 :- Alarm on condition.

PLC Ladder diagram for Alarm Security System

PLC Logic for Alarm Security Systems

PLC Alarm System PLC Burglar System

Program Description

In this problem we will consider S7-1200 PLC and TIA portal software for programming.

Network 1 :-

This network shows simple latching circuit for system ON and system OFF.

we used Normally Open (NO) contact of system START button (I0.0) and NC contact of system STOP button (I0.1) for system activation.

Network 2 :-

When system is activate and motion sensor (I0.2) detects the person entry, alarm on (M0.1) condition will be ON and it will activate the alarm (Q0.0).

Normally NC contact of window sensor (I0.3) is used in parallel so in normal condition it is true. If breakage of glass or window condition is detected, window sensor (I0.3) input goes false and it will activate the alarm condition (M0.1).

Network 3 :-

In this network latching circuit is used for alarm (Q0.0). If alarm condition is detected (M0.1), alarm will be ON and it can be stopped by pressing alarm STOP PB (I0.4).

Note :- Above logic is for explanation purpose only. We can implement this example by using hard wired relay logic also. S7-1200 PLC system is so costly for this simple system.

Runtime Test Cases

PLC based Security System

Author : Bhavesh

Articles You May Like :

PLC Program for Motor Starter

Analog Input Sampling in PLC

Positive Edge Output for One Cycle

Automatic Liquid Mixing Application

PLC Program START & STOP Buttons

Share With Your Friends

Related Articles

Top 100 PLC Objective Questions and Answers

S Bharadwaj Reddy

PLC Program for Fan Control Unit System for Industry

S Bharadwaj Reddy

Normally-open and Normally-closed Switch Contacts

S Bharadwaj Reddy

How to use Masked Move Instruction in PLC

S Bharadwaj Reddy

PLC Program for Bank Counter Application

S Bharadwaj Reddy

Series Tanks Level Control using PLC Ladder Programming

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

PLC Program for Alarm Security System

WordPress Image Lightbox

Send this to a friend