Honeywell 51402614-100 K2LCN-2 LCN Processor Board

Description

Product Introduction & Engineering Value

The Honeywell 51402614-100 is associated with the K2LCN-2 generation of TDC 3000 hardware, combining processor, memory, and Local Control Network interface functions on a single circuit-board assembly. This makes the part relevant to maintenance work on legacy TDC 3000 Universal Station and LCN-based architectures where an exact board-level replacement is required.

The 51402614-100 should be identified by its complete part number and board revision before installation. Supplier documentation also associates it with assembly 51402615-200, described as a K2LCN-2 circuit board with 2 megawords of memory.

Technical Specifications

The K2LCN architecture combined the Motorola 68020 processor, memory, and LCN interface on one board, according to available Honeywell-part catalog information for the K2LCN family.

Important identification note: Some current online listings describe 51402614-100 as an Ethernet or generic TDC interface board. Other records specifically cross-reference it to the K2LCN-2 / 51402615-200, 2-megaword configuration. Because these descriptions conflict, the board label, assembly number, hardware revision, and existing system documentation should be checked before treating a listing as an exact technical equivalent.

51402614-100

51402614-100

Field Application & the “Trench” Experience

A realistic maintenance scenario is an aging TDC 3000 installation where one Universal Station begins reporting an LCN-related hardware fault. The control strategy itself may still be valid, but the processor/LCN board becomes the suspect point. Rather than changing multiple system components, the maintenance team identifies the installed board by its 51402614-100 marking, compares the hardware revision against the spare, and verifies the associated K2LCN configuration before returning the station to service.

That distinction matters on legacy Honeywell systems. A board that looks physically similar is not automatically a valid substitute.

Niche applications

• TDC 3000 Universal Station LCN processing — maintaining processor and network-interface hardware in established operator stations.
• Legacy process-control workstation maintenance — replacing an aging K2LCN-2 board without redesigning the existing LCN architecture.
• Critical DCS spare-parts programs — holding an identified processor/LCN board for planned outage replacement rather than sourcing an unknown board after failure.

Transparency SOP: QA & Testing

For New Surplus inventory, the useful distinction is between physical condition and verified functionality. A practical incoming inspection should include:

1. Part-number inspection — confirm 51402614-100 and photograph the identification label.
2. Assembly verification — check whether the board carries the expected 51402615-200 association and verify the stated memory configuration where documented.
3. PCB inspection — examine connectors, socketed devices, components, traces, corrosion, contamination, and signs of previous repair.
4. Revision check — record hardware and firmware markings before dispatch.
5. Functional testing — where appropriate test the board in a compatible TDC 3000/K2LCN test environment rather than relying solely on a visual inspection.
6. ESD-controlled packaging — protect the board from electrostatic discharge during storage and shipment.

A supplier listing currently identifies 51402614-100 as a Honeywell TDC interface/circuit board and states a 12-month warranty, while other supplier records identify the same part number with the K2LCN-2 configuration. Warranty and test status should therefore be confirmed against the actual unit being purchased.

The Veteran’s Tech Trap Guide

⚠️ Trap #1 — Confusing the part number with the assembly number.
Do not order solely from a photograph or from the description “TDC interface board.” 51402614-100 and 51402615-200 can appear together in supplier records, but they are not necessarily interchangeable nomenclature. Verify what is printed on the existing board and its assembly documentation.

⚠️ Trap #2 — Ignoring revision markings.
Legacy Honeywell boards can have hardware and firmware revision identifiers that matter during replacement. Record the revision from the installed board before removing it.

PRO TIP: Treat this as a board-level replacement, not a generic Ethernet-card swap. One current marketplace describes 51402614-100 as an Ethernet board, while other records identify it specifically with the K2LCN-2 processor/LCN architecture. That discrepancy is enough reason to verify the system documentation before installation.

⚠️ Trap #3 — Skipping ESD controls.
A processor/LCN PCB should be handled using appropriate ESD precautions. Avoid touching edge contacts, IC pins, or connector contacts unnecessarily, and use conductive packaging for storage.

Dynamic FAQ

Q1: What system uses the Honeywell 51402614-100?
It is associated with the Honeywell TDC 3000 family and the K2LCN-2 Local Control Network architecture.

Q2: Is 51402614-100 the same as 51402615-200?
They are closely associated in supplier records: 51402615-200 is listed as an assembly using 51402614-100 as its part number, with a 2-megaword K2LCN-2 configuration. Verify the actual board and assembly markings before ordering.

Q3: What should I verify before replacing this board?
Confirm the complete part number, hardware revision, firmware marking, assembly number, existing K2LCN configuration, and the TDC 3000 system documentation.

Q4: Can a board described as an “Ethernet board” automatically replace 51402614-100?
No. Current online descriptions are inconsistent. Some catalogs call 51402614-100 an Ethernet/interface board, while other records identify it as a K2LCN-2 processor/LCN board. The physical board markings and system documentation should take precedence over a generic marketplace description.

Q5: Is New Surplus the same as used or refurbished?
No. “New Surplus” normally refers to unused excess inventory rather than a board that has been repaired or previously operated. For this part, request photographs of the actual label and PCB condition and confirm whether functional testing has been performed.

Q6: What warranty should I expect?
Warranty terms depend on the supplier and the actual stock condition. One current supplier listing for Honeywell 51402614-100 states a 12-month warranty, but the warranty offered with a specific unit should be confirmed before purchase.