遥控网络机箱。如果使用直接连接将数据传输到
每个I/O模块都需要11个连接才能传输所有数据
数据（一个连接到通信模块，一个连接
至十个I/O模块中的每一个）。如果使用机架优化连接
传输数据时，您只需要一个连接——连接
连接到通讯模块。由于1756-CNB模块仅限于64个
连接，使用机架优化连接可以节省宝贵的资源。
重要提示：尽管机架优化连接提供了一种
使用资源，它们的使用有一些限制：
•您只能使用机架优化连接发送数据
进出离散数字I/O模块。模拟输入/输出
需要直接连接。
•机架优化连接可以包含I/O数据和状态
仅供参考。其他模块信息，例如
诊断，不可通过机架优化
联系
•您必须对单个数据库中的所有数据使用一致的RPI
机架优化连接。因为你用的是一个
连接发送数据时，所有数据都将
以统一速率在同一消息中传输。
混合通信格式
当同一机箱中存在多个I/O模块时，用户可以混合使用
不同I/O模块的通信格式。I/O模块设置为使用
机架优化将以配置的RPI速率进行通信
1756-CNB模块。为直接通信配置的I/O模块
将以设定的RPI进行通信，而忽略CNB RPI。
重要提示：在RSLogix5000中设置正确的I/O配置后，
ControlNet上的I/O通信直到
RSNetWorx for ControlNet软件已运行。使用RSNetWorx
设置ControlNet网络的网络参数。
Assume you have set up a system that contains 10 discrete I/O modules in a remote ControlNet chassis. If you used direct connections to transfer data to each of the these I/O modules, you would need 11 connections to transfer all of the data (one connection to the communication module and 1 connection to each of the ten I/O modules). If you used a rack-optimized connection to transfer the data, you would only need a single connection – the connection to the communication module. Since the 1756-CNB module is limited to 64 connections, using rack-optimized connections can save valuable resources. Important:Although rack optimized connections offer an efficient way to use resources, there are a few limitations on their use: • You can only use rack optimized connections to send data to and from discrete digital I/O modules. Analog I/O requires direct connections. • Rack optimized connections can contain I/O data and status information only. Additional module information, such as diagnostics, is not available through a rack-optimized connection. • You must use a consistent RPI for all data in a single rack-optimized connection. Since you are using a single connection to send the data, all of the data will be transferred in the same message at a uniform rate. Mixing Communication Formats When multiple I/O modules exist in the same chassis, the user can mix Comm Formats for the different I/O modules. I/O modules set up to use Rack Optimization will communicate at the rate of the RPI configured for the 1756-CNB module. I/O modules configured for direct communication will communicate at their set RPI and ignore the CNB RPI. Important:After the proper I/O configuration is set up in RSLogix5000, I/O communication on ControlNet is not established until RSNetWorx for ControlNet software is run. RSNetWorx is used to set up the network parameters of a ControlNet network.
客服1