矿大(北京)表与自动化_9(2学时).ppt

第九章 计算机控制系统 Chapter 9 computer control system;Requirements:;本章内容： 第一节 概述 P216 第二节 集散控制系统 P219 第三节 现场总线控制系统 P227 ;第一节 概述;计算机控制的工作过程;计算机控制系统的组成;? ? ? 系统软件 支持软件 应用软件;二、计算机控制系统的组成;三、计算机控制系统的发展过程;1. 直接数字量控制;Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer).;The system installed at the University of Melbourne used a serial communications network, connecting campus buildings back to a control room front end system in the basement of the Old Geology building. Each remote or Satellite Intelligence Unit (SIU) ran 2 Z80 microprocessors whilst the front end ran 11 in a Parallel Processing configuration with paged common memory. ;2. 集中型计算机控制系统;优越性：从表面上看——信息集中，集中型计算机控制可以实现先进控制、联锁控制等各种更复杂控制功能；便于实现优化控制和优化生产。;3. 集散控制系统;A distributed control system (DCS) refers to a control system usually of a manufacturing system, process or any kind of dynamic system, in which the controller elements are not central in location (like the brain) but are distributed throughout the system with each component sub-system controlled by one or more controllers. ; The first industrial control computer system was built 1959 at the Texaco Port Arthur, Texas, refinery with an RW-300 of the Ramo-wooldridge Company [1] The DCS was introduced in 1975. Both Honeywell （霍尼韦尔公司）and Japanese electrical engineering firm Yokogawa (日本横河) introduced their own independently produced DCSs at roughly the same time, with the TDC 2000 and CENTUM [2] systems, respectively. US-based Bristol also introduced their UCS 3000 universal controller in 1975. In 1978 Metso (known as Valmet in 1978) introduced their own DCS system called Damatic (latest generation named Metso DNA[3]). In 1980, Bailey (now part of ABB-ASea Brown Boveri [4]) introduced the NETWORK 90 system. Also in 1980, Fischer Porter Company (now also part of ABB) introduced DCI-4000 (DCI stands for Distributed Control Instrumentation). ;DCS is a very broad term used in a variety of industries, to m