Description
The Honeywell 51304511-200 is a NIM modem paddle card manufactured by Honeywell, classified as a network interface module (NIM) I/O / modem card within the TDC 3000 distributed control system. It is the CE-compliant physical-layer interface that provides the UCN (Universal Control Network) cable connections inside the Network Interface Module.
The 51304511-200 is not a standalone controller — it is the “paddle card” that mates with the EPNI (Enhanced Process Network Interface) main logic board, typically 51401583-100, to form a complete NIM . Its job is to bridge the LCN (Local Control Network) and the UCN, carrying real-time process data, alarms, trends, and control commands between operator stations and UCN-based controllers such as APM and HPM. By consolidating the functions of the legacy PNM, PNM I/O, PNI I/O, and mini-coaxial assemblies onto one board, it simplifies the NIM architecture while preserving deterministic, redundant communication.
Application Scenarios
In a refinery crude-distillation unit running TDC 3000 since the 1990s, the original NIM still used the older PNI/PNM board set with hand-built mini-coax interconnects. During a planned upgrade, the instrument team replaced that tangle with the Honeywell 51304511-200 paddle card mated to an EPNI logic board. The single board cleaned up the card cage, eliminated the mini-coax harness as a failure point, and introduced the CE-compliant design the plant’s European operations required. With UCN A and B coaxial cables landed on the paddle’s redundant ports, a subsequent cable fault on one leg caused no interruption — the NIM failed over transparently and operators saw no data gap. The plant chose the 51304511-200 specifically as the direct replacement for the non-CE 51304511-100, avoiding a full migration to Experion PKS while meeting current compliance standards .
This case illustrates the practical role of the 51304511-200: it is the reliable physical gateway between the LCN supervisory layer and the UCN control layer in a TDC 3000 system. In petroleum refining, petrochemical plants, power generation, pharmaceutical manufacturing, and large pulp & paper facilities, the Honeywell 51304511-200 resolves recurring pain points — aging mini-coax harnesses, multi-board failure chains, non-CE legacy hardware in regulated regions, and the high cost and risk of a complete DCS migration. By restoring a clean, redundant, standards-compliant NIM interface, it protects real-time data flow and extends the life of a proven control investment.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 51304511-200 |
| Alternate Part Number | 51304511200; AC02W36-L0481 (cross-reference) |
| Manufacturer | Honeywell |
| Product Category | NIM Modem Paddle Card / NIM I/O Board (not a standalone controller) |
| System Platform | Honeywell TDC 3000 / TPS; Experion PKS integration capable |
| Paired Main Logic Board | EPNI (Enhanced Process Network Interface), e.g. 51401583-100 |
| Preceding (non-CE) Version | 51304511-100 |
| Successor (replacement CE NIM I/O) | 51305896-200 |
| Network Role | Bridge between LCN (Local Control Network) and UCN (Universal Control Network) |
| Physical Interfaces | Dual redundant coaxial ports for UCN Channel A and Channel B |
| Serial / Diagnostic Port | JPI serial (RX/TX) for firmware download and fault diagnosis |
| Backplane Connection | Gold-finger edge connector; mates to EPNI main board / NIM chassis backplane |
| Power Supply | Chassis 24 V DC (nominal; operating range 18–32 V DC typical) |
| Power Consumption | ≤ 15 W typical |
| Bus Type | UCN industrial real-time token-passing bus; millisecond-deterministic transport |
| Redundancy | A/B dual-link hot standby with fault-free, no-disturbance switching |
| Consolidated Legacy Functions | Replaces PNM, PNM I/O, PNI I/O, and mini-coax assemblies |
| Firmware Note | Firmware revision ‘H’ on 51401583-100 required for SOE time synchronization |
| Compliance | CE compliant (EMC and safety); RoHS where applicable by revision |
| Operating Temperature | 0 °C to +60 °C (cabinet installation) |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95%, non-condensing |
| Vibration | IEC 60068-2-6 compliant |
| Environmental Rating | IP20 / IP30 class (indoor cabinet) |
| Dimensions | 2.0 × 13.3 × 23.7 cm |
| Net Weight | 0.24 kg |
| Country of Origin | USA (Netherlands assembly reported by some suppliers) |
| HS / Tariff Code | 8537101190 |
| Condition (aftermarket) | New / refurbished, functionally tested, 12-month replacement warranty |
