1C31233G04 西屋 国外一手货源

详情描述：

　以西门子公司的SIMATIC NET为例，在其提出的全集成自动化(TIA)的系统概念中，核心内容即包括组态和编程的集成、数据管理的集成以及通信的集成。通信网络是这个系统重要的、关键的组件，提供了部件和网络间完善的工业通信。
 
　　SIMATIC NET包含了三个主要层次：
 
　　AS-I网——传感器和执行器通信的国际标准，扫描时间5ms，传输媒体为未屏蔽的双绞线，线路长度为300m，多为31个从站。
 
　　PROFIBUS——工业现场总线，用于车间级和现场级的国际标准，传输率大12m/s，传输媒体为屏蔽双线电缆(长9.6km)或光缆(长90km)，多可接127个从站。
 
　　工业以太网——用于区域和单元联网的国际标准，网络规模可达1024站1.5km(电气网络)或200km(光学网络)。
 
　　在这一网络体系中，尤其值得一提的是PROFIBUS现场总线，PROFIBUS是目前成功的现场总线之一，已得到广泛地应用。它是不依赖生产厂家的、开放式的现场总线，各种各样的自动化设备均可通过同样的接口交换信息。为数众多的生产厂家提供了优质的PROFIBUS产品，用户可以自由地选择合适的产品。PROFIBUS已经成为德国国家标准DIN19245和欧洲标准pr EN50170，并在世界拥有了多的用户数量。
 
　　四、PLC与工业控制计算机(IPC)和集散控制系统(DCS)的比较
 
　　1、各自技术发展的起源
　　计算机是为了满足快速大量数据处理要求的设备。硬件结构方面，总线标准化程度高，兼容性强，软件资源丰富，特别是有实时操作系统的支持，故对要求快速、实时性强、模型复杂和计算工作量大的工业对象的控制占有优势。
 
　　集散系统从工业自动化仪表控制系统发展到以工业控制计算机为中心的集散系统，所以其在模拟量处理、回路调节方面具有一定优势，初期主要用在连续过程控制，侧重回路调节功能。

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