Research On Reconfiguration Technology For ONC System

Numerical control technology and equipments, which are the core part of advancedmanufacturing system, are considered as key enabling technology and basic equipmentsfor emerging new and high technology industries. With advances in electronic andinformation, mass customization, make-to-order, quickly changing manufacturingprocess and capacity, shrinking product lifecycle and supply chain, product variety andindividuality have become the main characteristics of new manufacturing system, andCNC (Computer Numerical Controller) is a key technology to fulfill these demands,such as high speed, high accuracy, integrated and composited machining, intelligent, etc.Considering developing requirements of manufacturing system, open CNC system andreconfiguration technology fully utilizes advanced control functions, hardwire devices,and other innovations, through function block integration or reuse and control logicreconfiguration, to continuously changing its functions, machining process, hardwiredevices and manufacturing capacity to improve the adaptability and quickresponsiveness. From the national point, domestic CNC industry has been left longbehind the developed countries'. In order to improve CNC research efficiency,innovation capacity and technical level, open CNC system platform have to beenhanced. So in the National mayor S&T project and S&T support plan, open CNCinnovation platform, open CNC system network and other key technologies are broughtup as the main research subjects.Considering main characteristics of open CNC system and relate work aboutreconfiguration technology, a research on reconfiguration technology for open CNCsystem is carried out in this paper. The main works concentrate on open systemdevelopment and function design, open system architecture design, interoperationmethod between function blocks, and so on. With the implemented system architecture,interoperation methods, and communication and application interfaces, new CNCsystem can be designed quickly and flexibly by choosing function blocks as neededwhen needed, and the open requirements, such as modular, scalability, interoperabilityand so on, can be satisfied. And moreover, a reconfiguration method for open CNCsystem is brought up. Based on ideas of script language and software connection, thedesigned reconfiguration method mainly describes the relationship and topologybetween function blocks, and uses RIIS (Reconfiguration Instructions InterpretingSystem) to configure or reconfigure function Blocks as described to fulfill the diverseand individual needs. The main works are listed below.1. System development and function design based on function block. Consideringthe modular requirements of open CNC system, some work about function block, IEC61131-3and IEC61499standards are carried out. Combined with the main functionalities and execution process of CNC system, a standard function block modeland its implementation procedure for open CNC system is brought up. As open CNCsystem are constructed with modular structure and open application interfaces, themodular, reusability, extendibility requirements are satisfied.2. Open system architecture design. System architecture is the discipline thataddresses the high-level structure of system, providing the framework which can choose,integrate, and schedule execution procedure of function blocks. In this paper, layeredsystem architecture for open CNC system is brought up, including hardware layer,real-time operating system layer, CNC support layer, and application layer. The CNCsupport layer can be subdivided into basic system services, communication managementservices, reconfiguration services and other application interfaces. By using layeredsystem architecture, requirements such as portability, scalability and extendibility canbe satisfied. And also, the second-hand development and third part software integrationare facilitated.3. Research and implementation of function block interoperation. In order toincrease the interoperability of function blocks, this paper provides a standarddescription method for function block parameters, functionalities and other information,and provides a visual display method for function block information. At one hand, thefunction block parameter, execution state and other information can be displayed by thevisual component. At the other hand, the visual component can trigger controlinstructions or events to configure, diagnose, or debug function blocks. Experimentresults show that the designed method can greatly improve interoperability betweenfunction blocks.4. Reconfiguration and its verification method for CNC system. In order to fulfillthe diverse and individual requirements of manufacturing industry, and to increaseadaptability and rapid responsiveness of CNC system, a reconfiguration method foropen CNC system is brought up. Based on ideas of script language and softwareconnection, the reconfiguration method mainly describes the relationship of functionblocks, and uses RIIS to configure or reconfigure the topologies among function Blocks,which can improve the control structure and machining process of CNC system.Considering the verification complexity and hardware dependency of reconfigurableCNC system, hardware-in-the-loop simulation, in which machining process is simulatedby computer software, is utilized to reduce the verification risk and cost. Through usingsoftware to simulate different system environments, the reconfiguration method can beverified effectively and efficiently.