Automatic Door Open Close System PLC Ladder Program - Example No 4
Automatic Door Open Close System PLC Ladder Program
PLC Ladder Practice Problem:
- 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.
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 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.
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