Component Snapshot At-a-Glance

• Model: 51402455-100 (Internal designation MP-DNCF02-201, DNCF Dual Node Card File Backplane)
• Alt. P/N: 51401477-100 single-node backplane, non-interchangeable; this part supports dual-node redundant architecture only
• Product Series: Honeywell TDC3000 / TPS LCN Local Control Network classic chassis
• Hardware Type: Passive multi-layer PCB backplane, full DNCF card cage carrier with integrated fan mounting frame
• Key Feature: Electrically isolated dual independent node bus zones, heavy copper multi-rail power traces, dedicated LCN/UCN handshake signal routing for redundant node failover
• Primary Field Use: Main interconnect backbone inside dual-node DNCF chassis; carries DC power, LCN bus signals, chassis diagnostic telemetry for K4LCN, EPNI, SBHM, CLCN-A/B full-slot LCN node boards

Hard-Numbers: Technical Specifications

• Protocol Support: Passive signal routing only, Honeywell proprietary LCN 1Mbps synchronous bus, internal chassis parallel diagnostic bus
• Port Count: Multiple full-width gold finger card slots split into Node A / Node B isolated zones; rear edge connector for dual ACX633 power supply DC output; fan power header
• Baud/Data Rate: No on-board processing, signal timing matched to native LCN bus speed
• Operating Temperature: 0°C ~ +50°C cabinet operational; -40°C ~ +85°C storage
• Isolation Rating: 1500VAC galvanic isolation between Node A and Node B signal/power layers to block cross-talk noise
• Power Trace Capacity: Rated for dual 51196655-100 ACX633 power supplies, distributes +5V / ±12V / +27V to all slot cards
• Chassis Slot Layout: Zone A supports one 3-board node; Zone B supports one 2-board node, fully independent bus segmentation
• Physical Dimension: 19-inch rack mount (483mm W × 133mm H × 267mm D) full DNCF chassis cage assembly
• Vibration Tolerance: 0.5g continuous 10–60Hz cabinet vibration for offshore skid installations
• Certifications: CE Class B EMC, UL recognized, ATEX Zone 2 cabinet compliant
• Cooling Compatibility: Matched factory fan assembly for forced convection cooling of inserted processor/storage boards
• Weight: Bare backplane PCB ~0.42kg; complete DNCF chassis cage + fan ~9.1kg

The Real-World Problem It Solves

Single-node 51401477-100 backplanes cannot host dual redundant LCN nodes, making high-availability history/operator stations impossible to build. Replacing factory backplanes with discrete wiring looms creates loose vibration-induced contact faults, cutting LCN/UCN communication and causing permanent lost trend archive data during plant upsets. Generic aftermarket backplanes lack internal isolation barriers between Node A/B, bus cross-talk generates constant LCN node dropout alarms on large refinery LCN rings. Separate terminal power distribution blocks add extra rack hardware and introduce loose power connections leading to random board resets.Where you’ll typically find it:

• Refinery TPS dual redundant history DNCF chassis housing SBHM storage and K4LCN memory processor boards
• Fossil power plant boiler/turbine dual-node operator stations with EPNI Ethernet gateway and redundant CLCN-A/B LCN paddles
• Offshore FPSO legacy TDC3000 distributed dual-node control racks requiring fault-isolated redundant node bus segmentationThis integrated dual-zone backplane consolidates all power, LCN handshake and internal bus wiring onto one PCB, electrically segregates redundant node circuits and eliminates discrete wiring failure points.

Hardware Architecture & Under-the-Hood Logic

This is a fully passive interconnect PCB with no CPU, conversion or active processing circuits; it acts as the central wired backbone separating two electrically independent node zones for full dual-node redundancy.

1. Rear edge connector receives multi-rail DC power from dual redundant ACX633 power supplies; thick multi-layer copper traces distribute regulated voltages evenly to every slot position.
2. Internal PCB isolation barrier layers fully separate Node A and Node B signal zones, preventing single-side bus faults from propagating to the redundant partner node.
3. Dedicated parallel signal trace busses route LCN link status, UCN bridge handshake and chassis diagnostic telemetry to all full-slot processor/communication boards in each zone.
4. Precision gold finger slot edge pins maintain consistent low contact resistance under long-term cabinet vibration, avoiding intermittent board communication dropouts.
5. Integrated fan power header supplies operating voltage to the chassis cooling fan; airflow path designed to cool all inserted boards evenly and prevent thermal drift.
6. All chassis fault status signals routed through backplane traces to the primary node K4LCN board for logging into the TPS system event journal and operator alarm generation.

Field Service Pitfalls: What Rookies Get Wrong

Install Single-Node 51401477-100 Backplane Into Dual DNCF Chassis

New technicians substitute single-node spare backplanes to cut inventory costs. PCB trace layout only supports one node zone, the second node slot has no power or bus signal routing, fully breaking dual redundant node failover capability.Field Rule: All dual-node DNCF chassis must exclusively use 51402455-100 backplane; segregate single-node spares in clearly labeled storage bins to avoid mix-ups.

Only Wire One Redundant ACX633 Power Supply To Backplane Input

Crews leave the second redundant power supply disconnected to reduce wiring labor. Single power rail operation creates a full rack shutdown single point of failure if the active supply overheats or faults.Quick Fix: Terminate DC output cables from both matched 51196655-100 power supplies to the backplane dual power input terminals; verify balanced load sharing via chassis front panel LED indicators post-wiring.

Relocate Processor Boards Between Node A / Node B Zones Without Reconfiguring LCN Addressing

During spare swap-outs, technicians move K4LCN/EPNI/SBHM boards across zone boundaries without re-downloading node configuration. Cross-zone signal misalignment triggers LCN bus framing errors and mass node offline alarms on operator HMI displays.Field Rule: Fix all processor, storage and communication boards permanently to their original Node A/B backplane zones; re-download full LCN node configuration if any cross-zone board relocation occurs.

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.