Abstract: Developed with the PLC/Converter Technology is a roller table control system capable of getting steel tube stably head-tail aligned and separated within a specified 6-meter distance.Specifically speaking,this very control system can realize the operation of quick head-tail alignment of tubes with slight bumping at a position on the roller table with a 6-meter distance to the head of the main machine.As soon the tail end of the first tube runs out of the detector platform,the tail end of the first tube and the head-end of the second one are separated quickly so as to bring about single-piece discharge operation.And then the speed of the roller table keeps the same as that of the detecting machine in order to ensure the flaw detection precision.