The microcontroller based systems are having kind of artificial efficiency as microcontroller can be programmed as per the system requirement. The microcontroller is programmed to count the carton passing from conveyer and also to measure weight of carton box. As this system has its drawback on microcontroller measuring weight with advance measuring weight demands. There are many such systems are available which use online check-weightier to calculate the weight of object. If we use microcontroller then cost price of the system get increased. The major drawback of using microcontroller is that its hardware requirements will also go on increasing as it does not contain inbuilt timer, counter[4]. All this drawback of existing system is overcome in PLC based object sorting automation which sort object according to the height.