巴赫曼NT255Bachmann

NT255

现场总线和工业以太网是工业自动化领域中两种不同的通信技术，它们之间存在以下几个区别：

　　通信方式：现场总线采用总线结构，通过一条总线连接多个设备，实现设备之间的通信和数据交换；工业以太网采用星型、环型或者树型结构，通过交换机等设备连接多个设备，实现设备之间的通信和数据交换。

　　通信速率：现场总线通常采用串行通信方式，通信速率较低，一般为10Mbps以下；工业以太网采用并行通信方式，通信速率较高，一般为100Mbps或以上。

　　实时性：现场总线通常具有良好的实时性，可以满足工业自动化领域的实时控制需求；而工业以太网在实时性方面相对较弱，需要采用特殊技术和协议来提高实时性。

　　数据量：现场总线通常适用于数据量较小的场合，而工业以太网适用于数据量较大的场合。

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