分布式远动系统的结构与设计方法

ARCHITECTURE AND DESIGN METHODOLOGY FOR DISTRIBUTED SCADA SYSTEM

本文在论述了一般分布式数据处理系统的构成及其特点的基础上，讨论了分布式远动系统的结构，并提出了系统构成方法。结合作者的工作实践，对适用于分布式远动系统的监控局域网和通信规约进行了讨论。

The remote control system usually con-sists of master station and RTUS.Tbe artchtecture ofmaster or RTU canbedistributEd.In this way,apractical half-duplex communication network based onRS-422 is implemented in MS/RTU for electrical pow-er remote control systems.Each node in the RTU supports a transmissionline or a transformer set.Each node in the master sta-tion supports a data processing set,a CRT ,an LEDdisplay wall or a printer,etc. A dedicated OperatIng System is implemented inevery communication node in LAN. It manages theLAN communications,task scanning and interruptsprocessing.The LAN communication protocol has features of polling and token passing modes.With short fixedpackages and variable length data frames,it creates aflexible and efficient communication environment.