Many counting systems simply need to keep a record of the vehicles entering and leaving a car park and to display a ‘Full’ sign at the entrance when there are no free spaces. The entry barrier must be prevented from allowing vehicles to enter while the sign shows ‘Full’.

When the car park is empty, the count value is set to the total number of parking bays. As each vehicle enters the car park, the count is decremented. As each vehicle leaves the car park, the count is incremented. When the number of vehicles in the car park equals the total number of spaces, the sign at the entrance displays ‘Full’. At all other times the sign will display ‘Space’. The counter prevents the barrier control from allowing vehicles to enter while the sign shows ‘Full’.

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