艾伦-布拉德利1756-CNB或控制网桥模块是一个接口模块，用于将Controllogix机架连接到控制网网络。与艾伦-布拉德利1756-CNBR模块相比，1756-CNB用于标准的非冗余配置。如果用户应用程序的每个通信模块有40到48个Logix通信连接，那么这个模块是完美的。它的通信速率为每秒5兆字节，有99个节点可用。1756-CNB模块处理两件事，即当它与Logix5550控制器一起用于计划数据和非计划数据时对I/O数据的控制，在ControlLogix底板和ControlNet网络之间桥接数据。确保路径信息是正确的，以便正确地路由它接收的消息。1756CNB模块最多可支持64个与其它ControlNet设备的双向连接。它可以是计划连接和非计划连接的混合。但是，支持的连接数也取决于网络配置。如果应用程序需要更多的连接，用户可以添加另一个1756CNB模块，但他们必须确保在与第一个模块相同的机箱和网络中添加。它还可以为未连接的消息支持多达20个缓冲区。
1756-CNBD
它还有两个端口一个控制网BNC端口和一个控制网RJ45端口。这种ControlNet桥与Allen-Bradley平台的ControlNet模块兼容，如HFlexlO系统、POINTIO、SLC和PLC5ControlNet、ControlNet接口卡，包含合作伙伴模块。它可用于实现分布式/O应用，其中安装了大量包含Controllogix l/O模块的机架。它还可以用来桥接不同协议的网络，并通过ControlNet网络交换信息。在控制网系统中，与单个控制网桥模块的连接允许有一条到网络中主控制器的直接通路，在那里可以执行程序修改和测试。此外，该协议还可用于与人机界面(HMI)和监控与数据采集(SCADA)应用程序接口。它还能够通过访问显示连接屋性和错误计数器的模块在线背板连接来实现自我诊断。模块的前面板也提供有文本显示，其循环变化以显示模块名称、连接状态、节点地址和其他参数。
1756-CNBD
The Allen Bradley 1756-CNB or Control Bridge Module is an interface module used to connect the Controllogix rack to the control network. Compared to the Allen Bradley 1756-CNBR module, the 1756-CNB is used in standard non redundant configurations. If each communication module of the user application has 40 to 48 Logix communication connections, then this module is perfect. Its communication rate is 5 megabytes per second, with 99 nodes available. The 1756-CNB module handles two things, namely controlling I/O data when used with the Logix5550 controller for both planned and unplanned data, bridging data between the ControlLogix backplane and the ControlNet network. Ensure that the path information is correct in order to correctly route the messages it receives. The 1756CNB module can support up to 64 bidirectional connections with other ControlNet devices. It can be a mixture of planned and unplanned connections. However, the number of supported connections also depends on the network configuration. If the application requires more connections, users can add another 1756CNB module, but they must ensure that it is added in the same chassis and network as the first module. It can also support up to 20 buffers for unconnected messages.
1756-CNBD
It also has two ports, one control network BNC port and one control network RJ45 port. This ControlNet bridge is compatible with the ControlNet modules of the Allen Bradley platform, such as the HFlexlO system, POINTIO, SLC and PLC5ControlNet, ControlNet interface cards, and includes partner modules. It can be used to implement distributed/O applications, where a large number of racks containing Controllogix l/O modules are installed. It can also be used to bridge networks with different protocols and exchange information through the ControlNet network. In a control network system, the connection to a single control bridge module allows for a direct path to the main controller in the network, where program modifications and testing can be performed. In addition, this protocol can also be used to interface with human-machine interfaces (HMI) and monitoring and data acquisition (SCADA) applications. It can also achieve self-diagnosis by accessing the online backplane connection of modules that display connectivity and error counters. The front panel of the module also provides text display, which loops to display the module name, connection status, node address, and other parameters.
1756-CNBD
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