遙控網絡機箱。如果使用直接連接將數據傳輸到
每個I/O模塊都需要11個連接才能傳輸所有數據
數據（一個連接到通信模塊，一個連接
至十個I/O模塊中的每一個）。如果使用機架優(yōu)化連接
傳輸數據時，您只需要一個連接——連接
連接到通訊模塊。由于1756-CNB模塊僅限于64個
連接，使用機架優(yōu)化連接可以節(jié)省寶貴的資源。
重要提示：盡管機架優(yōu)化連接提供了一種
使用資源，它們的使用有一些限制：
•您只能使用機架優(yōu)化連接發(fā)送數據
進出離散數字I/O模塊。模擬輸入/輸出
需要直接連接。
•機架優(yōu)化連接可以包含I/O數據和狀態(tài)
僅供參考。其他模塊信息，例如
診斷，不可通過機架優(yōu)化
聯系
•您必須對單個數據庫中的所有數據使用一致的RPI
機架優(yōu)化連接。因為你用的是一個
連接發(fā)送數據時，所有數據都將
以統(tǒng)一速率在同一消息中傳輸。
混合通信格式
當同一機箱中存在多個I/O模塊時，用戶可以混合使用
不同I/O模塊的通信格式。I/O模塊設置為使用
機架優(yōu)化將以配置的RPI速率進行通信
1756-CNB模塊。為直接通信配置的I/O模塊
將以設定的RPI進行通信，而忽略CNB RPI。
重要提示：在RSLogix5000中設置正確的I/O配置后，
ControlNet上的I/O通信直到
RSNetWorx for ControlNet軟件已運行。使用RSNetWorx
設置ControlNet網絡的網絡參數。
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.
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