Car Parking System using PLC Programming

Car parking system is one of the examples in PLC program using RSLOGIX 500.

Car Parking System

There are two garages for parking four wheelers in the building. Each garage occupies maximum of 5 cars at a time. Each time cars enters PLC automatically counts it to a total sum of cars found in the garage.

Car Parking System using PLC Programming

If Limit exceeds, garage filled lamp should turn ON and directs other drivers to Gate 2 garage parking.

If Limit exceeds in both Gate 1 & 2, parking closed signal will turn on that a garage is full and notifying other drivers not to enter because there is no space available.

PLC Car Parking System

List of Inputs and Outputs

PLC Car Parking Sensors

PLC Car Parking System

Car Parking using PLC
Automatic Car Parking System using PLC Program

PLC Car Parking Logic Description


Latching rung to operate the system through Master Start and Stop PB.


Gate 1 entry to allow vehicles to enter using entry sensor.

RUNG0002 & RUNG 0003

To count the number of cars(maximum 5 cars in each garage) entry using  counter, If limit exceeds, Garage Gate 1 filled lamp will turn ON.

RUNG 0004 & RUNG 0005

When exit sensor turns ON, Exit gate should on to make a count using counters.

Rung 0006, 0007, 0008, 0009, 0010

When Garage 1 is completely filled; Gate 2 garage follows the same procedure as above mentioned logic.


  1. Up counters are used to accumulate car entry, Down counters are used to reduce one in the accumulator valve.
  2. One shot is used to give single pulse to counter.


The above explained Car Parking process is for example only. It may vary from real time. We can use this example program to understand the working of Counters and interlocking concept function in AB PLC.

Author : Hema Sundaresan

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