描述
FF总线提供了Hl和H2两种物理层标准。Hl是用于过程控制的低速总线,传输速率为31.25Kbps,传输距离为200m、450m、1200m、1900m四种(加中继器可以延长),可用总线供电,支持本质安全设备和非本质安全总线设备。H2为高速总线,其传输速率为1Mbps(此时传输距离为750m)或2.5bps(此时传输距离为为500m)。H1和H2每段节点数可达32个,使用中继器后可达240个,Hl和H2可通过网桥互连。FF的突出特点在于设备的互操作性、改善的过程数据、更早的预测维护及可靠的安全性。
过程现场总线Profibus
Profibus由Siemens公司提出并极力倡导,己先后成为德国国家标准DIN19245和欧洲标准EN50170,是一种开放而独立的总线标准,在机械制造、工业过程控制、智能建筑中充当通信网络。Profibus由Profibus-PA、Profibus-DP和Profibus-FMS三个系列组成。Profibus-PA (Process Automation)用于过程自动化的低速数据传输,其基本特性同FF的H1总线,可以提供总线供电和本质安全,并得到了专用集成电路(ASIC)和软件的支持。Profibus-DP与Profibus-PA兼容,基本特性同FF的H2总线,可实现高速传输,适用于分散的外部设备和自控设备之间的高速数据传输,用于连接Profibus-PA和加工自动化。Profibus-FMS适用于一般自动化的中速数据传输,主要用于传感器、执行器、电气传动、PLC、纺织和楼宇自动化等。后两个系列采用RS485通信标准,传输速率从9.6kbps到12Mbps,传输距离从1200M到l00m(与传输速率有关)。介质存取控制的基本方式为主站之间的令牌方式和主站与从站之间的主从方式,以及综合这两种方式的混合方式。Profibus是一种比较成熟的总线,在工程上的应用十分广泛。
产品承诺
保 证 全新原装进口,
保 证 安全准时发货,
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优势价格,大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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