1756-CNBD ControlNet 网络的接口模块 

Allen-Bradley 1756-CNB 或 ControlNet 桥接模块是用于将 ControlLogix 机架连接到 ControlNet 网络的接口模块。与 Allen-Bradley 1756-CNBR 模块相比，1756-CNB 用于标准的非冗余配置。如果用户应用程序每个通信模块有 40 到 48 个 Logix 通信连接，则该模块是完美的选择。它的通信速率为每秒 5 兆字节，并且有 99 个可用节点。1756-CNB 模块处理 2 件事，即当 I/O 数据与 Logix5550 控制器一起用于计划数据和非计划数据时，在 ControlLogix 背板和 ControlNet 网络之间桥接数据。请确保路径信息正确无误，以便正确路由它收到的消息。

64-CNB 模块最多可支持与其他 ControlNet 设备的 1756 个双向连接。它可以是计划内连接和计划外连接的混合。但是，支持的连接数还取决于网络配置。如果应用程序需要更多连接，用户可以添加另一个 1756-CNB 模块，但他们必须确保在与第一个模块相同的机箱和同一网络上执行此操作。对于未连接的消息，它还可以支持多达 20 个缓冲区。它还具有 2 个端口 - 1 个 ControlNet BNC 端口和 1 个 ControlNet RJ45 端口。用户在安装1756-CNB模块时，需要先设置模块的节点地址开关。他们可以从 01 到 99 中选择唯一的节点地址。然后，用户可以通过使用 1 组模块将该模块用作独立控制模块，或者通过使用相同的模块对（合作伙伴）将其用作冗余控制设置。请注意，使用冗余控制时，节点地址交换机应具有相同的节点地址。1756 伏直流电下的 5.1-CNB 电流消耗为 970 毫安，如果电流消耗为 1 伏直流电，则为 7.24 毫安。其额定功耗为 5.14 瓦。

1756-CNB 是一款 ControlLogix 通信适配器，用于将任何 ControlLogix 机架连接到 ControlNet 数据高速公路。该模块是一个单插槽模块，带有一 （1） 个用于非冗余介质操作的 BNC 连接器和一 （1） 个 NAP（RJ-45 8 针，带屏蔽）的集成通信端口。

该 ControlNet 桥接器与 Allen-Bradley 平台的 ControlNet 模块兼容，例如 Flex IO 系统、POINT IO、SLC 和 PLC5 ControlNet、ControlNet 接口卡、包含合作伙伴模块。

它可用于实现分布式 I/O 应用程序，其中安装了大量包含 ControlLogix I/O 模块的机架。它还可用于跨不同协议的网络桥接，并通过ControlNet网络交换信息。在 ControlNet 系统中，连接到单个 ControlNet 桥接模块允许直接连接到网络中的主控制器，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） 以及监控和数据采集 （SCADA） 应用程序连接。

它还能够通过访问模块的在线背板连接来实现自我诊断，该连接显示连接属性和错误计数器。模块的前面板还提供了一个文本显示，可以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 ControlNet 网络的接口模块 

The Allen-Bradley 1756-CNB or ControlNet Bridge module is an interface module used to connect the ControlLogix rack to the ControlNet network. Compared to the Allen-Bradley 1756-CNBR module, the 1756-CNB is used in a standard non-redundant configuration. If the user application has 40 to 48 Logix communication connections per communication module, this module is the perfect choice. It has a communication rate of 5 megabytes per second and has 99 nodes available. The 1756-CNB module handles 2 things, namely bridging data between the ControlLogix backplane and the ControlNet network when I/O data is used with the Logix5550 controller for planned and unplanned data. Make sure that the path information is correct so that it can correctly route the messages it receives.

The 64-CNB module can support up to 1756 bidirectional connections with other ControlNet devices. It can be a mix of planned and unplanned connections. However, the number of connections supported also depends on the network configuration. If the application needs more connections, users can add another 1756-CNB module, but they must make sure to do so in the same chassis and on the same network as the first module. It can also support up to 20 buffers for unconnected messages. It also has 2 ports - 1 ControlNet BNC port and 1 ControlNet RJ45 port. Before installing the 1756-CNB module, you need to set the node address switch of the module. They can select unique node addresses from 01 to 99. The user can then use this module as an independent control module by using 1 set of modules, or as a redundant control setting by using the same pair of modules (partners). Note that when using redundant control, the node address switch should have the same node address. The current consumption of 5.1-CNB at 1756 volts DC is 970 mA, or 7.24 ma if the current consumption is 1 volt DC. Its power consumption rating is 5.14 watts.

The 1756-CNB is a ControlLogix communications adapter for connecting any ControlLogix rack to the ControlNet data highway. The module is a single slot module with one (1) BNC connector for non-redundant media operation and one (1) integrated communication port for NAP (RJ-45 8-pin, shielded).

The ControlNet bridge is compatible with the ControlNet module of the Allen-Bradley platform, Examples include Flex IO systems, POINT IO, SLC and PLC5 ControlNet, ControlNet interface cards, and partner modules.

It can be used to implement distributed I/O applications where a large number of racks containing ControlLogix I/O modules are installed. It can also be used to bridge networks across different protocols and exchange information over the ControlNet network. In ControlNet systems, connecting to a single ControlNet bridge module allows a direct connection to the primary controller in the network, where program modifications and testing can be performed. In addition, the protocol can be used to connect with Human machine interface (HMI) and supervisory control and data acquisition (SCADA) applications.

It is also capable of self-diagnosis by accessing the module's online backplane connection, which displays connection properties and error counters. The front panel of the module also provides a text display that can be looping to display the module name, connection status, node address, and other parameters.