AB 1756-CNBR/E ControlNet Communications Bridge Series E

You can use the 1756-CNB and 1756-CNBR Series E modules as standalone or in firmware version 11.xx as redundant control. For standalone control, only one set of modules is required. For redundant control, two ControlLogix chassis are populated with identical pairs of modules called partners. The chassis that performs active control is called the primary chassis and the modules in the chassis are called primary modules. The other chassis is called the secondary chassis and the modules in the chassis are called secondary modules. These installation instructions discuss both standalone and redundant control; read them carefully to distinguish the procedures and requirements for each type of control.

The figure Chassis Slot Numbering shows chassis slot numbering in a 4-slot chassis. Slot 0 is the first slot and is always the leftmost slot in the rack (the first slot to the right of the power supply). You can use any size ControlLogix chassis and install the module in any slot. You can also install multiple 1756-CNB and 1756-CNBR modules in the same chassis. You can install as many modules as your power supply can accommodate (such as the number for which the power supply is rated).