Research on CNC equipment interconnection based on OPC UA

• 1、Chongqing University State Key Laboratory of Mechanical Transmissions,Chongqing,400044

Abstract：OPC UA is one of the key enabling technologies of CNC equipment interconnection at present, and many manufacturers propose OPC UA communication scheme for their own equipment and private data acquisition protocol. However, due to lacking of standard CNC equipment information model specification in OPC UA, the equipment models constructed by different manufacturers are not uniform, it is difficult to truly realize semantic interoperability between various equipment. Therefore, this paper proposes a solution of CNC equipment interconnection, which includes data acquisition protocol integration, information modeling and development of model instantiation. Firstly, the object-oriented method based on meta model is used to build a complete, standard and extensible CNC equipment (machine tool and robot) information model, which provides a standard for the modeling of CNC equipment; Secondly, the unified rules of model mapping for OPC UA are defined; Then, XML technology, plug-in technology and OPC UA server development technology are used to instantiate information model, and by subscribing to data information of server using general OPC UA client, information sharing and interconnection between CNC equipment is achieved. Finally, KND machine tool and GSK loading robot are taken as examples to test on the platform set up by China National Machine Tools Quality Supervision Testing Center.

Keywords： mechanical manufacturing and automation CNC equipment interconnection information model OPC UA