Honeywell 51305072-300 / CLCN-B – Dual-Node LCN Coax B I/O Board for TDC/TPS Systems

Honeywell 51305072-300, referenced as CLCN-B, is the Local Control Network (LCN) Coax B I/O board used in legacy Honeywell TDC 3000 / TPS nodes. From my experience, this is the companion to the Coax A interface—providing the second channel in dual-node or redundant LCN architectures so communications stay stable between consoles, controllers, and application modules. You might notice that keeping a spare CLCN-B on the shelf typically turns a network-side fault into a quick, like-for-like swap with no cabinet rewiring.

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

• LCN Coax B interface – Provides the node’s Channel B connection to the LCN trunk; complements Coax A for dual-node resiliency.
• Backplane powered – Draws power and data paths from the Honeywell node chassis; no external PSU wiring.
• Service-friendly connectors – Clearly labeled coax and terminal provisions make outage swaps faster and cleaner.
• Legacy stability – Typically drop-in compatible with existing TDC/TPS nodes and cable plant.
• ESD-conscious build – Designed for control room environments and continuous duty operation.

Technical Specifications

Details reflect common characteristics for Honeywell LCN Coax B boards. Share your node tag and LCN topology and we’ll confirm a precise fit before shipment.

Application Fields

• TDC 3000 / TPS networks interconnecting consoles, application modules, and controllers
• Control rooms maintaining or extending legacy coax LCN segments
• Brownfield projects keeping the LCN layer intact while nodes are refreshed over time
• Sites standardizing OEM spares to reduce downtime risk on critical network paths

Advantages & Value

• Low integration risk – In many cases a direct drop-in with existing cabinet wiring and topology.
• Uptime protection – A ready spare CLCN-B can restore a node’s Channel B within minutes.
• Compatibility – Designed for Honeywell node backplanes and approved LCN coax components.
• Spares strategy – Traceable part numbers and a 365‑day warranty fit outage planning and storeroom standards.

Installation & Maintenance

• ESD handling – Use a grounded wrist strap and antistatic surface during board changes.
• Coax best practices – Maintain proper impedance, termination, and bend radius; secure strain relief at entry points.
• Routing – Keep LCN coax separated from high‑EMI conductors and VFD cable bundles.
• Commissioning – Confirm node health on LCN, check error counters, and verify dual‑node redundancy behavior.
• Routine checks – Inspect connectors for oxidation, re‑seat if needed, and document any topology updates.

Quality & Certifications

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

A quick note from a site tech: “Swapped the CLCN‑B and our dual‑node link stabilized instantly—no drawing changes.” Share your node type, cabinet tag, and LCN segment details, and we’ll validate the 51305072‑300 / CLCN‑B fit so it ships ready for your maintenance window.