Honeywell 51308111-002 LCN Coaxial Cable

The Honeywell 51308111-002, also cataloged as the 51308111-002 LCN Coaxial Cable, operates as a dedicated hardware component for high-speed Local Control Network (LCN) token-ring data serialization within TDC 3000 and TotalPlant Solution (TPS) process automation architectures. This dual-cable assembly connects processor nodes, distributing real-time global database updates between network boards and backplane transceivers.

Hardware Specifications

Process Control and DCS Metrics

• FOUNDATION Fieldbus / Profibus PA Connectivity and Network Bridges: The passive cable link provides the physical medium over which high-level LCN nodes communicate, managing data frames from primary process networks. It routes data packets bound for downstream interfaces, maintaining transmission velocity alignment across foundational control layers and industrial bus systems.
• Channel-to-Channel Isolation and Electromagnetic Suppression: The assembly features molded anti-interference ferrites on each terminal end to damp high-frequency common-mode noise. This mechanical configuration blocks parasitic electrical fields from entering node transceivers, safeguarding logic paths and preserving physical isolation boundaries between redundant communication slots.

Frequently Asked Questions

Q: How do the integrated ferrites affect the transmission characteristics of the LCN network?

A: The molded ferrites function as high-frequency inductive chokes. They increase impedance solely against transient electromagnetic interference (EMI) and radio frequency interference (RFI) without attenuating the baseband carrier signals of the 2.0 m data link.

Q: Can this cable assembly be hot-plugged directly into an active LCN transceiver port?

A: Yes. Because the cable is a passive physical component, it can be decoupled or connected without dropping node power. However, disconnecting an LCN cable will break that specific channel's network loop, triggering an immediate failover to the redundant coaxial line.

Field Installation Guidelines

• Chassis Layout Alignment, Clearance Constraints, and Mechanical Seating: Thread the BNC connectors straight onto the workstation network board ports, turning clockwise until the pins snap firmly into the locking slots. Maintain a minimum bend radius constraint of 50 mm along the 2.0 m cable path to prevent dielectric deformation or internal shield fracture near the ferrite bodies.
• Conductor Separation, Wireway Constraints, and Shield Grounding: Route the dual LCN coaxial cables inside separate panel raceways isolated from high-potential AC lines or motor actuator leads. Grounding occurs automatically through the outer braid contacting the BNC bulkhead, shunting induced stray fields directly to the central chassis grounding bar.