The Research On P-FMS Control System Network Platform Based On Intranet

Pseudo - Flexible manufacturing system(P-FMS) is a economical Flexible Manufacturing system for the situation of our country . It possesses the following main characters. First, it properply debases the degree of automation, and abandons the unattended appeal, so it permitts the NC machine tool, the common machine tool and the manual work worktable to exist in one product line. Sencond, by exerting the function of software, it preserves fully flexible character of system and gains very good benefit. To improve the roboticized level of our country's manufacturing , it is quite important to carry out the research and application on the Pseudo-Flexible manufacturing technology nowadays.It is a common and pivotal technology to design the control system in do-it-yourselfery constructing and developing P-FMS. The paper focuses on the establishment of the P-FMS Control Network platform , and presents the structure of P-FMS network owning two star-topology in term of the model of OSI/ISO and the structure of Ethernet + TCP/IP . The paper goes deep into TCP/IP protocol on the base of embedded Intenet technology , and develops a embedded gateway owning feature of P-FMS through elaborating software and hardware. The embedded gateway enables NC device and man-machine conversation terminal to connect with network for running instead of barely communicate with one computer. In terms of two star-topology and their different requirement on real time communications, the paper designs two real time communications models(they are virtual token passing model and master-slave model) on the basis of making detailed study on real time communications technology. The two models ensure the real time and order of the information transmission of P-FMS network. Through the close combination of the Manufacture Message Specification(MMS) and the P-FMS network's actual requirement, the paper selects five MMS service types to design the user sublayer . By utilizing network control of Delphi, the communications sublayer of P-FMS network is realized, and the relevant software is exploited. Finally, the network platform of the whole system is set up .The above network platform has been validated in the LAN of the laboratory, the performance of network and the result of system running that emerge from locale testing indicate the effectivity and practicality of the paper .