IC660EBA025
IC660EBA025
IC660EBA025
IC660EBA025
(3) 双向传输:传统的4-20mA电流信号，一条线只能传递一路信号。现场总线设备则在一条线上既可以向上传递传感器信号，也可以向下传递控制信息。
(4) 自诊断:现场总线仪表本身具有自诊断功能，而且这种诊断信息可以送到中央控制室，以便于维护。
(5) 节省布线及控制室空间:在FCS中多台现场设备可串行连接在一条总线上，这样只需极少的线进入中央控制室，大量节省了布线费用，同时也降低了中央控制室的造价。
(6) 多功能仪表:可在一个仪表中集成多种功能，做成多变量变送器，集检测、运算、控制于一体。
(7) 开放性与互操作性:现场总线标准保证不同厂家的产品可以互操作，这样就可以在一个企业中由用户根据产品的性能、价格选用不同厂商的产品集成在一起，避免了传统控制系统中必须选用同一厂家的产品限制，促进了有效的竞争，降低了控制系统的成本。
(8) 智能化与自治性:现场总线设备能处理各种参数、运行状态信息及故障信息，具有很高的智能化，能在部件、甚至网络故障的情况下独立工
作，大大提高了整个控制系统的可靠性和容错能力。
2.2.2 IEC61158国际标准规定的几种常见总线及适用领域：
(1)基金会现场总线，即Foundation Fieldbus,简称FF。其前身是以美国Fisher-Rosemount公司为首，联合Foxboro、YOKOGAWA、ABB、SIEMENS等80家公司制定的ISP协议和以Honeywell公司为首、联合欧洲等地150家公司制定的WordFIP协议。FF总线是针对过程自动化而设计，它是通过数字、串行、双向的通信方法来连接现场装置的。
基金会总线分低速H1和高速H2两种通信速率。H1的传输速率为31.2kbps,通信距离可达1900m（可加中继器延长），可支持总线供电，支持本质安全防爆环境。H2的传输速率为1Mbps和2.5Mbps两种，其通信距离为750m和500m。
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