根据国际电工委员会（IEC）和美国仪表协会(ISA)的定义：现场总线是连接智能现场设备和自动化系统的数字、双向传输、多分支结构的通信网络，它的关键标志是能支持双向多节点、总线式的全数字通讯，具有可靠性高、稳定性好、抗干扰能力强、通信速率快、系统安全、造价低廉、维护成本低等特点。
●国际电工协会（IEC）的SP50委员会对现场总线有以下三点要求：
（1）同一数据链上过程控制单元（PCU）、PLC等与数字1/0设备互连；
（2）现场总线控制器可对总线上的多个操作站、传感器及执行机构等进行数据存取；
（3）通信媒体安装费用较低。

●SP50委员会提出的两种现场总线结构模型是：
（1）星型总线用短距离、廉价、低速率电缆取代模拟信号传输线
（2）总线型总线数据传输距离长、速率高，采用点对点、点对多点和广播式通信方式

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厦门仲鑫达自动化设备有限公司
欧阳英（销售经理）
移动电话：13394057292
电话：0592-5856292
传真：0592-5165561
邮箱：370848070@qq.com
Q Q ：370848070 , 2687338778
地址；厦门思明区湖滨东路湖光大厦8楼A单元
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专业销售大型控制系统及各种进口模块备件品牌销售：Allen Bradley（罗克韦尔）: 1756/1757/1747/1746/1771/1785系列、Reliance机电等产品。 Schneider（施耐德）：MODICON 140系列、Quantum内存卡、Quantum电源模块等。GE（美国通用电气）IC693/IC697系列PLC 模块，FOXOBORO FBM/CP30/CP40/CP60模块,TRICONEX冗余容错系统模块:3700A/3805E/3604E/3503E/3504E，等一些停产备品、备件的销售。
所有备件的质保期均为1年，经过专业测试认证。

如果您需要订购产品超过1件，请与我们联系，我们可以为您提供折扣。

我们仅采用快递方式递送备件。（顺丰）

如果您发现其他供货商为相同产品提供更为低廉的价格，我们也愿意参照其价格向您提供进一步的折扣。如果还有其他任何问题，请随时与我们联系。

请让我们知道您有任何，备品，备件，的需要，我们可以给您进一步的援助，我们等候您的询盘。

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