機械外文翻譯--分布式機床的設(shè)計（英文）

1、Design of the Distributed Architecture of a Machine-tool Using FIP Fieldbus Daping SONG, Thieny DIVOUX, Francis LEPAGE Centre de Recherche en Automatique de Nancy Universite de Nancy I, BP239, 54506 Vandoeuvre-les-Nanc

2、y cedex, France Abstract: In this paper we propose a distributed control system based on FIP fieldbus. It is applied to machine-tool as a replacement for the traditional CNC (Computerized Numerical Controller). The sy

3、stem is composed of a set of microprocessor-based modules (PCs, motion controllers, I/Os, ...) interconnected by FLP real-time network. The main idea is to enable each module to be intelligent, improving thus th

4、e jlexibility and the fault tolerant capability of the whole system. Each module being a sub-control system, accomplishes its own control task, some of them for motion control and others for evaluating sensors and reg

5、ulating actuators. The communication (information exchanges and synchronization) among these modules is ensured by FP. This system allows both task distribution as well as equipment topological distribution. We discus

6、s some distribution criteria and describe an experimental implementation. 1. Introduction Distributed system architecture has been the subject of many research activities in recent years. It plays a major role in syste

7、ms integration. In the machine-tool control domain, present CNC technology has its inherent shortcomings. It is centralized, lunited to a fixed number of axis, time-consuming, inflexible and diEcult to be integrated in

8、 CIM environment. The rapid development of VLSI microprocessor technology and communication network enables the distributed control to be considered. Distributed control systems present the advantage of improving perf

9、ormance, modularity, integrity and reliabihty while allowing incremental expansion without complete hardware replacement. It offers a promising alternative to control system architecture. This paper is dedicated to st

10、udy a distributed machine-tool architecture. It is based on intelligent devices interconnected on communication link. It is characterized by distributed tasks and distributed data, but w i t hunique control access syst

11、em[S]. It is designed by using standard devices and FIP fieldbus and verified by a experimental implementation, in which the system controls a multi-axis machine to successfully execute a coordinated motion as well as

12、to respond to sensors values changes. The paper is organized as follows. In section 2, the machine-tool control system architecture is described. Section 3 is dedicated to functional analysis, control function distrib

13、ution as well a sthe criteria and constraints of the distribution. Section 4 gives a brief description of FE' and Section 5 outlines our experimental implementation. We conclude in section 6 w i t hsome general re

14、marks and future research perspectives. 250 1063-6862/96 $5.00 0 1996 IEEE parallel architecture w i l lspeed up the total computation and improve the machining quality , productivity and precision. For auxiliary ope

15、ration control, there is the same problem, i.e., the more the devices there are, the more the sensors and actuators are needed. The logical automatism is based on a periodc processing. For a given set of sensors and ac

16、tuators, their values are readlcomputed in a periodic way. If the processing can be distributed over several nodes and carried out in a parallel way, then the period for computing each sub-set of sensors and actuators

17、will be smaller, lading to a considerable reduction of the initial pericd. Which allows us to meet more easily real-time requirements. 1 p1 I _........................................ “ I ' Fig. 2 Multi-axis s

18、ervo system A l lthus have led us to propose a new distributed architecture Fig. 3) for machine-tool control, where each node integrates a communication module and has a local decision power for actions on the physical

19、 devices. The general organization of these nodes is managed by a dedicated system which keeps global decision and distributes as well as coordinates remotes tasks. node 1 Fig. 3 Distributed machine-tool control archite

20、cture 3. Distribution criteria The fimctional architecture which is the result of the specification stage expressed in a formal way. This model is built disregarding the choice of hardware and communication network. The