计算机和网络技术的飞速发展,引起了自动化控制系统结构的变革,一种世界上最新型的控制系统即现场总线控制系统(Fieldbus Control System,FCS)在上世纪九十年代走向实用化,并正以迅猛的势头快速发展。现场总线控制系统是目前自动化技术中的一个热点,正越来越受到国内外自动化设备制造商与用户的关注。现场总线控制系统的出现,将给自动化领域在过程控制系统上带来又一次革命,其深度和广度将超过历史的任何一次,从而开创自动化的新纪元。
FCS可以说是第五代过程控制系统,是由PLC(Programmable Controller)或DCS(Distributed Control System)发展而来的。FCS与PLC及DCS之间有千丝万缕的联系,又存在着本质的差异。本文针对PLC、DCS、FCS三大控制系统的特点、性能和差异作一分析。
1 PLC、FCS三大控制系统的基本特点
目前,在连续型流程生产工业过程控制中,有三大控制系统,即PLC、DCS和FCS。它们各自的基本特点如下:
PLC
1.从开关量控制发展到顺序控制、运算处理,是从下往上的。
2.逻辑控制、定时控制、 计数控制、 步进(顺序)控制、连续PID控制、 数据控制――PLC具有数据处理能力、 通信和联网等多功能。
3.可用一台PC机为主站,多台同型PLC为从站。
4.也可一台PLC为主站,多台同型PLC为从站,构成PLC网络。这比用PC机作主站方便之处是:有用户编程时,不必知道通信协议,只要按说明书格式写就行。
5.PLC网络既可作为独立DCS/TDCS,也可作为DCS/TDCS的子系统。
6.主要用于工业过程中的顺序控制,新型PLC也兼有闭环控制功能。
FCS
1.FCS是第五代过程控制系统,它是21世纪自动化控制系统的方向。是3C技术(Communication,Computer, Control)的融合。基本任务是:本质(本征)安全、危险区域、易变过程、难于对付的非常环境。
(2)全数字化、智能、多功能取代模拟式单功能仪器、仪表、控制装置。
3.用两根线联接分散的现场仪表、控制装置,取代每台仪表的两根线。“现场控制”取代“分散控制”;数据的传输采用“总线”方式。
4.从控制室到现场设备的双向数字通信总线,是互联的、双向的、串行多节点、开放的数字通信系统取代单向的、单点、并行、封闭的模拟系统。
5.用分散的虚拟控制站取代集中的控制站。
6.把微机处理器转入现场自控设备,使设备具有数字计算和数字通信能力,信号传输精度高,远程传输。实现信号传输全数字化、控制功能分散、标准统一全开放。
7.可上局域网,再可与internet相通。既是通信网络,又是控制网络。
8.3类FCS的典型应用:1) 连续的工艺过程自动控制如石油化工,其中“本安防爆”技术是绝对重要的;2)分立的工艺动作自动控制如汽车制造机器人、汽车;3)多点控制如楼宇自动化。
这三大控制系统,尤其是DCS、PLC,都在电站得到了广泛应用,而且效果也非常好。
系统差异
差异
2.1.1 DCS或PLC
PLC系统与DCS系统的结构差异不大,只是在功能的着重点上的不同,DCS着重于闭环控制及数据处理。PLC着重于逻辑控制及开关量的控制,也可实现模拟量控制。
DCS或PLC系统的关键是通信。也可以说数据公路是分散控制系统DCS及PLC的脊柱。由于它的任务是为系统所有部件之间提供通信网络,因此,数据公路自身的设计就决定了总体的灵活性和安全性。数据公路的媒体可以是:一对绞线、同轴电缆或光纤电缆。
DCS的特点是:(1)控制功能强。可实现复杂的控制规律,如串级、前馈、解耦、自适应、最优和非线性控制等。也可实现顺序控制。(2)系统可靠性高。(3)采用CRT操作站有良好的人机界面。(4)软硬件采用模块化积木式结构。(5)系统容易开发。(6)用组态软件,编程简单,操作方便。(7)有良好的性价比。
通过数据公路的设计参数,基本上可以了解一个特定DCS或PLC系统的相对优点与弱点。
1.系统能处理多少I/O信息。
2.系统能处理多少与控制有关的控制回路的信息。
3.能适应多少用户和装置(CRT、控制站等)。
4.传输数据的完整性是怎样彻底检查的。
5.数据公路的最大允许长度是多少。
6.数据公路能支持多少支路。
7.数据公路是否能支持由其它制造厂生产的硬件(可编程序控制器、计算机、数据记录装置等)。为保证通信的完整,大部分DCS或PLC厂家都能提供冗余数据公路。
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