51308112-100 Honeywell LCN Cable Datasheet & Technical Manual

Honeywell 51308112-100 Local Control Network Series

The Honeywell 51308112-100, also cataloged as the Honeywell 51308112-100 Coaxial Cable Set, operates as a dedicated hardware component for data transmission within Local Control Network (LCN) platforms.

Hardware Specifications

Process Control and DCS Instrumentation Channel Characteristics

The physical interface utilizes an RG11 coaxial construction framework optimized for high-frequency token-pass data communication across the Local Control Network (LCN). The cable assembly relies on a fixed 4-20 mA HART loop protocol physical isolation model via specific characteristic impedance matchings that control attenuation profiles over long distances. To enforce channel-to-channel isolation and mitigate transient high-frequency noise, the assembly features integrated inline ferrite cores. These passive magnetic components establish inductive choking barriers, providing robust electromagnetic interference (EMI) and cross-talk suppression while maintaining strict signal clarity for data transmissions across the DCS backbone.

Frequently Asked Questions

Q: Does this cable assembly support hot-swap insertion or connection changes while the LCN is actively communicating?

A: No, interrupting or disconnecting active LCN coaxial segments can disrupt token-ring network integrity and cause a localized or system-wide node communication failure. Any hardware changes or cable insertions must occur during planned maintenance windows or when network segments are properly bypassed.

Q: What are the backplane current consumption impacts of utilizing a 200-meter RG11 assembly?

A: As a completely passive coaxial assembly, the hardware does not draw power from the module backplanes. However, the transceiver cards interfacing with this 200-meter segment must operate within their prescribed line-driver milliamp tolerances to overcome baseline signal attenuation.

Field Installation Guidelines

• Bending Radius Constraints: Maintain the minimum physical bending radius prescribed for heavy-duty RG11 coaxial cables during layout. Kinking or over-bending the cable will deform the internal dielectric layer, altering local impedance metrics and generating data packet reflections.
• Ferrite Placement Verification: Ensure the integrated ferrite cores remain physically intact and correctly positioned at both cable termination ends. These units provide the primary line-to-ground common mode noise rejection prior to the signal entering the transceiver interface.
• Shielding Ground Grounding: Connect the external coaxial shields to the designated LCN system ground point in accordance with the standard plant engineering manual. Do not allow multi-point shield grounding paths that risk creating induced ground loops.