Honeywell 51401583-100 EPNI | NIM Main Logic LCN-UCN Bridge Board for TDC3000/TPS DCS - Field Service Notes

Honeywell 51401583-100 EPNI | NIM Main Logic LCN-UCN Bridge Board for TDC3000/TPS DCS – Field Service Notes

Component Snapshot At-a-Glance

Model: 51401583-100 (EPNI, Enhanced Process Network Interface, NIM main logic board)
Alt. P/N: Legacy PNI 51401582-100 + PNM modem split board pair; cannot cross-substitute
Product Series: Honeywell TDC3000 / TPS LCN + UCN dual network NIM chassis
Hardware Type: Full-width rack slot main processor board for Network Interface Module (NIM)
Key Feature: Integrated dual LCN A/B transceivers + UCN bus translation logic, consolidates old two-board PNI/PNM hardware into single PCB
Primary Field Use: Act as bridge between LCN operator/history network and UCN controller HPM network, paired with 51305896-200 NIM Modem for Modbus RTU third-party device polling.