The Dual Node Module is a chassis containing one or two nodes. Each node performs an independent function and occupies a specific address on the Local Control Network (LCN). The types of nodes available in the Dual Node Module include Application Modules, Network Interface Modules, History Modules, Universal Stations, Hiway Gateways, and other types of gateways.

The Dual Node Module can accommodate (one) three-board node and (one) two-board node. Each node has its own unique power supply-the Dual Node Power Supply (DNPWR). The Dual Node Module also includes a front panel, and a cooling fan assembly. The chassis consists of a card cage and backpanel assembly. The component cards (boards) mount in the front of the card cage assembly, and the associated input/output (I/O) boards mount in the rear, similar to the method used in Five- and Ten-Slot Modules.