6SL3224-0BE32-2UA0

描述

6SL3224-0BE32-2UA0

集中式数字控制系统于七八十年代占主导地位。采用单片机、PLC、SLC或微机作为控制器，控制器内部传输的是数字信 号，因此克服了模拟仪表控制系统中模拟信号精度低的缺陷，提高了系统的抗干扰能力。集中式数字控制系统的优点是易于根据全局情况进行控制计算和判断，在控制方式、控制机时的选择上可以统一调度和安排；不足的是，对控制器本身要求很高，必须具有足够的处理能力和极高的可靠性，当系统任务增加时，控制器的效率和可靠性将急剧下降。集散控制系统（DCS）于八、九十年代占主导地位。其核心思想是集中管理、分散控制，即管理与控制相分离，上位机用于集中监视管理功能，若干台下位机下放分散到现场实现分布式控制，各上下位机之间用控制网络互连以实现相互之间的信息传递。因此，这种分布式的控制系统体系结构有力地克服了集中式数字控制系统中对控制器处理能力和可靠性要求高的缺陷。在集散控制系统中，分布式控制思想的实现正是得益于网络技术的发展和应用，遗憾的是，不同的DCS厂家为达到垄断经营 的目的而对其控制通讯网络采用各自专用的封闭形式，不同厂家的DCS系统之间以及DCS与上层Intranet、Internet信息网络之间难以实现网络互连和信息共享，因此集散控制系统从该角度而言实质是一种封闭专用的、不具可互操作性的分布式控制系统且DCS造价昂贵。在这种情况下，用户对网络控制系统提出了开放化和降低成本的迫切要求。FCS正是顺应以上潮流而诞生，它用现场总线这一开放的，具有可互操作的网络将现场各控制器及仪表设备互连，构成现场总线控制系统，同时控制功能彻底下放到现场，降低了安装成本和维护费用。因此，FCS实质是 一种开放的、具可互操作性的、彻底分散的分布式控制系统，有望成为21世纪控制系统的主流产品。现场总线是将自动化最底层的现场控制器和现场智能仪表设备互连的实时控制通讯网络，遵循ISO的OSI开放系统互连参考模型的全部或部分通讯协议。FCS则是用开放的现场总线控制通讯网络将自动化最底层的现场控制器和现场智能仪表设备互连的实时网络控制系统

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