Honeywell 51306673-100 / EPNI – Enhanced Plant Network Interface for TDC/TPS Nodes

Honeywell 51306673-100, commonly referred to as EPNI, is the Enhanced Plant Network Interface used in legacy TDC 3000 / TPS environments to present node data onto the plant Ethernet network. From my experience, it’s the go‑to board when you want stable, OEM‑supported Ethernet connectivity without reworking cabinet wiring or changing node configuration. You might notice that a like‑for‑like EPNI swap typically brings the plant network link back in minutes—handy during tight outage windows or brownfield migrations to Experion.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock; no more than 1 month at the latest
• Payment method: 50% advance payment; full payment for delivery
• Express delivery methods: FedEx, UPS, DHL

Key Features

• Plant Network interface – Presents TDC/TPS node data onto plant Ethernet; typically used for operator stations, servers, and peer links.
• Backplane integration – Draws power and control signals through the Honeywell node chassis; no external PSU in most cases.
• Drop‑in replacement – Like‑for‑like board change usually restores service without cabinet rewiring.
• Service‑friendly design – Clearly labeled connectors and status indicators make verification faster during outages.
• Legacy migration friendly – Useful in staged upgrades where the LCN/TPS side is retained while plant network services evolve.

Technical Specifications

Specs reflect what’s commonly associated with Honeywell EPNI hardware. Share your cabinet tag, node type, and network details, and we’ll confirm the exact fit before shipment.

Application Fields

• TDC 3000 / TPS control rooms linking nodes to plant Ethernet for operator stations and servers
• Brownfield migrations where Experion services consume data from legacy nodes
• Peer‑to‑peer node communications and historian connectivity over the Plant Network
• Spare strategies to de‑risk plant network outages on mature systems

Advantages & Value

• Low integration risk – In many cases a direct, like‑for‑like swap that preserves wiring and node setup.
• Uptime focused – A verified spare EPNI often turns a network fault into a same‑shift recovery.
• Compatibility – Native fit for Honeywell node backplanes and plant Ethernet practices.
• Lifecycle support – Traceable part numbers and a 365‑day warranty align with planned outages.

Installation & Maintenance

• ESD handling – Use a grounded wrist strap and antistatic surface during board changes.
• Networking – Assign IP address and subnet per site policy; verify link speed/duplex and port security.
• Cable routing – Keep Ethernet away from high‑EMI conductors; maintain bend radius and strain relief.
• Commissioning – Check link/activity LEDs, confirm node visibility on the Plant Network, and verify application services.
• Routine care – Inspect connectors for oxidation; document any network configuration changes in the cabinet log.

Quality & Certifications

• UL/CE conformity typical for control room modules (revision dependent)
• RoHS status varies by vintage; we can confirm per required build
• Manufacturer’s warranty: 12 months from shipment

What we hear from sites: “Swapped the EPNI and the node was back on the Plant Network before shift change.” Share your node type, cabinet tag, and network settings, and we’ll validate the 51306673‑100 EPNI fit and ship on your schedule.