Honeywell 51401946-100 K4LCN – Main Process Control Board | TDC 3000 LCN Platform
Engineering Background: The Honeywell TDC 3000 (Total Distributed Control) system has been the backbone of continuous process industries—refining, petrochemical, power generation, and pulp & paper—since the 1980s. The Local Control Network (LCN) is the high-speed peer-to-peer data highway that interconnects all intelligent nodes within the TDC 3000 architecture. The 51401946-100 K4LCN is the fourth-generation LCN Main Process Control Board, engineered to deliver deterministic real-time control with enhanced memory capacity and improved fault tolerance over its predecessors.
Product Positioning: Designed for procurement engineers and maintenance teams responsible for sustaining legacy TDC 3000 installations, this board serves as the central processing unit of the K4LCN node. It executes control strategies, manages LCN communications, and interfaces with I/O subsystems. Sourced, inspected, and verified by Konmask.com—your trusted industrial automation parts specialist.
Complete Technical Specifications
- Part Number: 51401946-100
- Module Designation: K4LCN (4th Generation LCN Node)
- Manufacturer: Honeywell Process Solutions
- Platform Compatibility: Honeywell TDC 3000 / LCN Architecture
- Board Function: Main Process Control Board — central CPU and LCN communication controller
- Network Interface: Local Control Network (LCN) — dual-redundant coaxial highway
- Processing: Real-time deterministic control execution
- Memory: Enhanced RAM/ROM capacity vs. K2LCN / K3LCN predecessors
- Form Factor: Standard TDC 3000 card cage module
- Power Supply: Supplied via TDC 3000 card cage backplane
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Humidity: 5% to 95% RH, non-condensing
- Weight: Approx. 1.0 kg
- Condition: Refurbished / Tested surplus — fully functional
- Revision: Rev. 100 (as indicated by suffix -100)
Proven Application Environments
- Petroleum refining and upstream oil & gas production facilities
- Petrochemical and specialty chemical plants
- Power generation — coal, gas turbine, and combined-cycle plants
- Pulp, paper, and forest products manufacturing
- Pharmaceutical batch and continuous process operations
- Food & beverage large-scale continuous processing lines
- Water treatment and municipal utility control systems
Engineering Advantages
- Drop-in Replacement: Direct plug-in replacement for existing K4LCN nodes — no firmware reconfiguration required in most installations
- Deterministic Performance: Guarantees scan-cycle consistency critical for closed-loop regulatory control
- Dual-Redundancy Ready: Supports redundant LCN highway configurations for high-availability architectures
- Extended Service Life: Enables continued operation of TDC 3000 systems beyond OEM support windows
- Backward Compatible: Interoperable with K2LCN and K3LCN nodes on the same LCN highway
- Proven Reliability: Field-proven in 24/7 continuous process environments with multi-year MTBF records
System Architecture & Signal Flow
Within the TDC 3000 architecture, the K4LCN node connects to the LCN highway via dual coaxial cables (primary and secondary). The 51401946-100 Main Process Control Board manages all node-level functions:
- LCN Communication Layer: Handles token-passing protocol, node addressing, and data highway arbitration
- Control Execution Layer: Runs CL (Control Language) programs — regulatory, sequential, and logic control
- I/O Interface Layer: Communicates with HPM (High-Performance Process Manager) and UCN-connected I/O subsystems
- Diagnostics Layer: Continuous self-test routines with fault annunciation to the Universal Station (US) or GUS console
Sourcing & Quality Verification
- ✔ Visual Inspection: Board inspected for physical damage, corrosion, and component integrity
- ✔ Functional Test: Powered-on and verified for LCN communication and control execution capability
- ✔ ESD Handling: Packaged in anti-static shielding bag with foam cushioning
- ✔ Traceability: Part number and revision verified against Honeywell documentation
- ✔ Warranty: 90-day operational warranty against defects in materials and workmanship
Procurement Process
- Confirm Compatibility: Verify your TDC 3000 system revision and K4LCN node firmware version with your DCS engineer before ordering
- Request Quote: Contact [email protected] for volume pricing, lead time, and export documentation
- Place Order: Purchase directly via this listing or via purchase order (PO) for approved accounts
- Shipping: Ships within 1–3 business days; worldwide export available with commercial invoice and packing list
- Receiving Inspection: Inspect upon receipt and report any discrepancies within 48 hours
Technical FAQ
Q: Is the 51401946-100 compatible with both redundant and non-redundant LCN configurations?
A: Yes. The K4LCN board supports both simplex and redundant LCN highway configurations. Redundancy is managed at the node level through the LCN interface circuitry on this board.
Q: Can this board replace a K2LCN or K3LCN main board?
A: The K4LCN is a generational upgrade and is not a direct pin-compatible swap for K2LCN or K3LCN boards. The entire K4LCN module (chassis + boards) must be used together. However, K4LCN nodes coexist on the same LCN highway as K2LCN and K3LCN nodes.
Q: What is the typical lead time for this part?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, typical sourcing lead time is 2–4 weeks. Contact us for real-time availability.
Q: Do you provide a test report or certificate of conformance?
A: A functional test report is available upon request. Certificate of Conformance (CoC) can be provided for qualified orders. Contact [email protected].
Q: What export documentation is available?
A: We provide commercial invoice, packing list, and HS code documentation (8537.10). ECCN classification and export license guidance available upon request for controlled destinations.
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