2711-t10c3

描述

2711-t10c3

按功能比较，现场总线连接自动化最底层的现场控制器和现场智能仪表设备，网线上传输的是小批量数据信息，如检测信息、状态信息、控制信息等，传输速率低，但实时性高。简而言之，现场总线是一种实时控制网络。局域网用于连接局域区域的各台计算机，网线上传输的是大批量的数字信息，如文本、声音、图像等，传输速率高，但不 要求实时性。从这个意义而言，局域网是一种高速信息网络。衡量一套控制系统的总体成本，不仅考虑其造价，而且应该考察系统从安装调试到运行维护整个生命周期内总投入。相对DCS而言，FCS开放的体系结构和OEM技术将大大缩短开发周期，降低开发成本，且彻底分散的分布式结构将1对1模拟信号传输方 式变为1对N的数字信号传输方式，节省了模拟信号传输过程中大量的A/D、D/A转换装置、布线安装成本和维护费用。因此从总体上来看，FCS的成本大大低于DCS的成本。现场总线发展迅速，现处于群雄并起、百家争鸣的阶段。目前已开发出有40多种现场总线，如Interbus、Bitbus、DeviceNet、MODbus、Arcnet、P-Net、FIP、ISP等，其中最具影响力的有5种，分别是FF、Profitbus、HART、CAN和LonWorks（性能对照见表1）
FF（Foundation Fieldbus现场基金会总线）由美国仪器协会（ISA）1994推出，代表公司有Honeywell和Fisher-Rosemount，主要应用于石油化工、连续工业过程控制中的仪表。FF的特色是其通讯协议在ISO的OSI物理层、数据链路
层和应用层3层之上附加了用户层，通过对象字典OD（Object Dictionary）和设备描述语言DDL（Device Description Language）实现可互操作性。目前基于FF的现场总线产品有，美国Smar公司生产的压力温度变送器，Honeyweill&Rockweill 推出的ProcessLogix系统，Fisher-Rosemount推出的PlantWeb。

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DEC 54-24970-01 FIBER OPTICS MODULE

DEC 70-20579-01 SUPERSTAR BACKPLANE

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DEC 70-33289-01 SCSI ENCLOSURE*CHASS​IS*

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