Description

The Honeywell K4LCN-16 51403519-160 is a Local Control Network (LCN) node processor board designed for high-performance computing within Honeywell TotalPlant Solution (TPS) and TDC 3000X system environments. It functions as the central LCN node processor kernel, executing core control system software, managing Local Control Network point data, and providing the processing baseline required for advanced process control and Application ModuleX (AXM) coprocessor integration.

Featuring a 68040 microprocessor with integrated floating-point calculation hardware, the Honeywell K4LCN-16 51403519-160 provides on-board processing speed and execution capacity for complex control algorithms, custom data segments, and Control Language (CL) applications. The board is equipped with 16 megawords of memory via a horizontally pluggable DIMM-style mezzanine board assembly (51402755-100), fulfilling the expanded memory requirements needed for TPS Software Release 500 and later.

Operating in five-slot chassis configurations, the Honeywell K4LCN-16 51403519-160 interfaces directly with the LCN backplane through an associated CLCN A/B I/O or LCN I/O board. In Application ModuleX architectures, it operates alongside an HP-UX-based coprocessor (WSI2 assembly) to bridge high-level UNIX process control solutions with low-level TDC 3000 real-time plant data structures.

Features

• Driven by a 68040 processor with dedicated floating-point calculation hardware capability for high-speed control execution.
• Equipped with 16 megawords of on-board memory utilizing a Dual In-line Memory Module (DIMM) style mezzanine card.
• Serves as the LCN node processor kernel supporting TotalPlant Solution (TPS) system software Release 500 and later.
• Direct integration capability with HP-UX coprocessors (WSI2 boards) in Application ModuleX (AXM) node architectures.
• Comprehensive front-edge visual diagnostic status array, including a 3-digit alphanumeric Node Address/Error Display.
• On-board Error Detection and Correction (EDAC) with LED indication for single-bit and multi-bit RAM errors.
• Integrated diagnostic tracking for DTAK timeout, BGAK timeout, bus parity errors, data compare errors, and LCN transaction failures.
• Backplane compatibility with CLCN A/B I/O and standard LCN I/O cards for dual-redundant coaxial LCN cable connections.

Applications

• TotalPlant Solution (TPS) LCN Nodes: Functions as the primary processing engine for LCN-based system nodes requiring high-speed floating-point computations.
• Application ModuleX (AXM) Execution: Executes real-time Control Language (CL) routines, maintains LCN point databases, and interfaces directly with HP-UX coprocessor solutions.
• Legacy TDC 3000X Upgrades: Provides memory expansion to 16 megawords required when upgrading system software to Release 500 or higher.
• Plant Information Network (PIN) Data Gateway: Serves as the real-time control link bridging LCN process data with higher-level plant information networks.

Technical Specifications

Connections / Interfaces

Installation Guidelines

1. Pre-Installation Inspection: Verify the physical integrity of the circuit board, edge connectors, and the mounted 16 Megaword memory mezzanine card (51402755-100).
2. Address Pinning Verification: Ensure all LCN address jumpers on the K4LCN-16 board (TS1/TS2 block) are completely removed when installing behind a CLCN A/B I/O or LCN I/O card. Pinning must be set exclusively on the rear I/O board.
3. Chassis Preparation: Confirm system power is switched OFF at the node power supply. Electrostatic Discharge (ESD) protective grounding must be used during handling.
4. Board Mounting: Slide the board into Slot 1 of the 5-slot LCN chassis until the backplane connectors seat firmly. Secure the board using the top and bottom extraction/insertion levers.
5. System Cabling Check: Confirm that LCN Coax A and Coax B network cables are securely attached to the corresponding CLCN A/B rear I/O card.

Replacement Recommendations

1. Software Shutdown: Before removing power, execute an orderly node processor software shutdown via the LCN AM Status display. Perform a second shutdown command to force the node into a failed state, preventing surrounding LCN nodes from marking it isolated.
2. Power Down Sequence: Turn off the chassis power supply only after confirming that dependent coprocessor systems (such as the WSI2 board yellow LED) have completely shut down.
3. Memory Board Handling: Replacement K4LCN boards ordered from spare parts may arrive without the memory mezzanine board. Transfer or install a dedicated 16 Megaword board prior to insertion.
4. Post-Replacement Commissioning: Apply power and observe the front panel LEDs. Ensure the green "Self-Test Pass" LED illuminates and the 3-digit display correctly reflects the node address assigned on the rear LCN I/O board.