If anyone help me, I have to do a Ladder Program of a Parking Lot with a capacity of 20 cars. When a car drive in to the parking Lot a sensor (input1) lift a barrier and keep it up for 20 seconds and then takes its original position, when a car want to exit the parking, another sensor (input2) lift anopther barrier and keep it up too for 20 seconds. The important thing is when the capacity comes to 20 cars, the system must disabled.
Ok Thanx
Ok Thanx