The Honeywell 51304511-200 (NIM) Interface board is the CE I/O for the Enhanced Process Network Interface (EPNI) board 51401583-100 which is the main logic board that identifies the NIM (Network Interface Module). The NIM provides the interconnection between the Universal Control Network (UCN) and the Local Control Network (LCN) containing xPM and LM nodes and their point databases. Firmware revision 'H' for board 51401583-100 is required if SOE time synchronization is required.

The 51304511-200 Modem is the CE Compliant paddle card in the NIM with connections for the UCN network cables, A & B. This single paddle board replaces the functions of the PNM, the PNM I/O, the PNI I/O, and the mini-coax in the older configurations of the NIM. The MODEM can be used for a carrier band PIN (Plant Information Network) in the Network Gateway.

NETWORK INTERFACE MODULE (NIM)_The UCN point which defines where the UCN resides, and the node-specific points that define the nodes on that UCN, including the NIM and the PM, are built in this activity. Also, the PM data points are built in this activity. Usually, the NIM consists of a pair of redundant NIMs.

The Non-CE compliant NIM I/O is 51304511-100
The replacement CE NIM I/O is 51305896-200

The earlier configuration of the NIM used the older PNI and PNM boards to perform the functions that are now managed by the EPNI.