1756-CNBD 桥接模块是用于将ControlLogix机架连接到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, then this module is perfect. It has a communication rate of 5 megabytes per second and has 99 nodes available. The 1756-CNB module handles 2 things, namely when it is used with the Logix5550 controller, controlling I/O data, for planned and unplanned data, bridging data between the ControlLogix backplane and the ControlNet network. Make sure the path information is correct so that the messages it receives are correctly routed.

The 64-CNB module supports 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 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 choose 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 1756-CNB has a current consumption of 970 mA at 5.1 volts DC and 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. This module is a single-slot module that integrates one (1) BNC connector for non-redundant media operation and one (1) integrated communication port for NAP (RJ-45 8-pin tape shield).