HONEYWELL 51305072-300 CLCN-B

Description

Product Description

HONEYWELL 51305072-300 CLCN-B is a C-Link Communication Module (CLCN), specifically the “B” version, for the Honeywell TDC 3000 Distributed Control System. This module, part number 51305072-300, is a vital network interface card that enables communication between a Universal Control Network (UCN) device and a TDC 3000 Local Control Network (LCN). Its primary function is to act as a dedicated gateway, translating protocols and data between the high-speed UCN (where Advanced Process Managers/APMs reside) and the plant-wide supervisory LCN (where Universal Stations and History Modules reside). The HONEYWELL 51305072-300 CLCN-B is an essential component for integrating process control with operator interfaces and data historians in a classic TDC 3000 architecture. For engineers maintaining legacy systems, this module is a critical spare part for sustaining communication integrity.

Product Parameters / Technical Specifications

• Manufacturer: Honeywell
• System: TDC 3000 Distributed Control System
• Functional Designation: C-Link Communication Module (CLCN), Series B.
• Network Interfaces:
  • LCN Port: Connects to the 5 Mbps coaxial Local Control Network.
  • UCN Port: Connects to the 5 Mbps Universal Control Network.
• Form Factor: A large, proprietary circuit board designed for a specific slot in a Network Interface Module (NIM) or similar chassis.
• Node Address: Configured with a unique address on both the LCN and UCN networks.
• Function: Serves as a protocol converter and router, managing the exchange of real-time process data, history, and commands between the two networks.
• Performance: Handles the data throughput required for multiple process control loops and operator graphics updates.
• Status Indicators: Features status LEDs for power, network activity (LCN/UCN), and fault conditions.

Advantages and Key Features

• Critical System Integration: The HONEYWELL 51305072-300 CLCN-B was the essential hardware link that enabled the modular TDC 3000 system to function as a unified whole, connecting the process control layer (UCN) with the operator and information layer (LCN).
• Deterministic Performance: Provided reliable, time-synchronized data transfer between networks, which was crucial for coordinated plant-wide control and monitoring.
• Dedicated Hardware Gateway: Offloaded communication processing from the main controller CPUs, improving the overall performance and reliability of both the UCN and LCN segments.
• Established Legacy Standard: For decades, this module was a cornerstone of thousands of TDC 3000 installations, representing a proven and stable technology for its era.

Application Cases in Industry

• TDC 3000 System Integration: Used in any TDC 3000 system requiring communication between UCN-based process managers (APM, HPM) and LCN-based operator stations, history modules, or application modules.
• Legacy System Expansion: Added when connecting a new UCN process cabinet to an existing LCN in a refinery, chemical plant, or power generation facility.
• Critical Spare Part: The primary application today is as a replacement for a failed CLCN module to restore communication between the control network and the operator consoles in a legacy plant still running on TDC 3000.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Confirm Absolute System Compatibility: The HONEYWELL 51305072-300 CLCN-B is only for specific versions of the TDC 3000 system using UCN and LCN. Verify your system model and software release. The -300 suffix and B revision are critical.
2. Document Network Addresses: Before replacing a failed module, you must record the LCN and UCN node addresses (set via switches on the old module) and any other configuration from the original. The new CLCN-B module must be configured with the exact same addresses to avoid network conflicts.
3. Major System Impact: Replacing this module severs the communication link between an entire section of the process control system (UCN) and the operators. This requires a planned and coordinated process unit shutdown.
4. Handle with Extreme Care (ESD & Physical): These are large, static-sensitive, legacy cards. Use rigorous ESD protection (wrist strap, mat). Be very careful with the heavy card and its fragile edge connectors.
5. Post-Replacement Diagnostics: After installation, thorough testing is required. This includes checking that the module appears correctly on both the LCN and UCN networks via system diagnostics and verifying that data flows to/from the associated process manager.
6. Sourcing from Legacy DCS Specialists: The TDC 3000 platform is obsolete. Source the 51305072-300 CLCN-B only from vendors who specialize in legacy Honeywell DCS support. They can provide tested/refurbished modules, confirm revision compatibility, and may offer installation guidance.

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