Abstract:

      This paper presents a PLC based application instance of robot palletizing product line. An industrial computer and a PLC exist in this instance, which constitute an upper and a lower computer control system. The functionalities of the upper computer are instruction control and information management, while the lower computer is responsible for logic control. The upper computer and the lower computer communicate through a free port and a user can devise a communications protocol by himself, which make system control be more flexible and convenient. Practical application indicates that such design can implement automatic palletizing, and also has such advantages as better reliability and stability.

Key words: PLC, control system, palletizing, free-port communications mode