Basic PLC Ladder Programming Example 15

Basic PLC  Ladder Programming Training Example 15 :

Automatic Door Open Close System PLC Ladder
Program
Basic PLC Ladder Programming Training Examples for Beginners. Hi Friends here we are starting a series of Free Training on PLC Ladder Programming. These PLC Ladder Programs are important to get basics of Ladder Programs

PLC Ladder Practice Problem:

Basic PLC Ladder Programming Example 15
Basic PLC Ladder Programming Example 15

  • When someone enters the infrared sensing field, opening motor starts working to open the door automatically till the door touches the opening limit switch  If the door touches the opening limit switch for 7 sec and nobody
    enters the sensing field, the closing motor starts working to close the door automatically till the closing limit switch touched together. 
    Stop the closing action immediately if someone enters the sensing field during the door closing process.
Topics Covered in this example is Automatic opening closing Door PLC Program .
Number of PLC Inputs Required 
 
X0 – X0 = ON when someone enters the sensing field.
X1 – Closing limit switch. X1 = ON when 2 switches touched together.
X2 – Opening limit switch. X2 = ON when the door touched the switches. 
Number of PLC Outputs Required 
 
Y0 -Opening motor
Y1 – Closing motor  
Number of PLC Timers Required 
 
T0 – 7 sec timer. Time base: 100ms 
Number of PLC internal memory flag Required
 
M1013 – 1s clock 

PLC Ladder Programming: 

 
PLC Ladder Program for Automatic Door open Close

PLC Ladder Programming Description: 

  •  X0 = ON if someone enters the sensing field of the infrared sensor. Y0 will be ON and latched, and the door will be opened as long as the opening limit switches X2 = OFF. 
  • When the door touches the opening limit switches, X2 = ON. The timer T0 will start to count for 7 sec if no one enters the sensing field (X0 = OFF). After 7 sec., Y1 will be ON and latched and the door will be closed.
  • During the closing process, X0 = ON if someone enters the sensing field. The NC contact X0 will be activated to turn Y1 off. Because X0 = ON, X2 = OFF and Y1 = OFF, Y0 will be ON and the door will be opened once again. 

http://www.plc-scada-dcs.blogspot.com

Leave a Comment

Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.

Powered By
CHP Adblock Detector Plugin | Codehelppro