Honeywell LCN B Experion Local Control Network Series

The Honeywell LCN B, also cataloged as the LCN B Experion Local Control Network Bridge, serves as the primary LCN B physical communication bridge utilized to execute protocol conversion and data routing between legacy Classic COAX LCN systems and Fault Tolerant Ethernet (FTE) frameworks. This multi-processor hardware node interfaces localized processing cells, enabling users to migrate coaxial node layouts to modernized Ethernet architectures while retaining historical databases, graphics packages, and terminal configuration tables.

Hardware Specifications

Process Control and DCS Metrics

• Coaxial-to-Ethernet Bridge Isolation Mapping: The device uses specialized physical layer transceivers to isolate the 100 Mbps Fault Tolerant Ethernet (FTE) logic from legacy 95-ohm COAX LCN signaling paths. By enforcing rigorous channel-to-channel isolation parameters between the primary and secondary network taps, the internal circuit boards prevent voltage surges from disrupting operational processor rings.
• 4-20 mA HART Loop Protocol Noise Suppression: The metal casing of the Process Module and Termination Assembly acts as a faraday shield to isolate high-frequency data clock frames. This design stops high-velocity digital square waves from radiating into adjacent panel channels, preventing inductive or capacitive interference in nearby low-potential 4-20 mA HART loop protocol cabling or analog field input blocks.

Frequently Asked Questions

Q: How does the ELCN Bridge retain legacy control parameters upon unexpected power disruptions?

A: The module relies on a dual-memory configuration consisting of 1 GB DDR3 SDRAM and 256 MB non-volatile NOR FLASH. While active communication mapping frames are updated within high-speed volatile SDRAM, core software files, network routes, and station node variables are permanently written to the pre-flashed NOR FLASH memory bank to allow instant cold-start recovery.

Q: Can an LCN B bridge assembly be deployed as a single standalone node without structural redundancy?

A: While a single bridge can technically execute protocol conversion, Honeywell system design standards restrict active process control configurations to a fully redundant, synchronized pair. This setup keeps data streams continuous during a component failure by initiating an immediate hot-standby switchover with minimal transmission lag.

Field Installation Guidelines

• Chassis Layout Alignment, Clearance Constraints, and Mechanical Seating: Guide the 2000 g Process Module smoothly onto the alignment rails of the standard UEA 19" Rack frame. Fasten the two specialized structural mounting screws tightly to secure the assembly against vibrations, keeping a clear 50 mm clearance gap around the perimeter of the housing to support natural convective heat dissipation.
• Conductor Separation, Wireway Constraints, and Shield Grounding: Route the legacy 95-ohm coaxial trunks and incoming AC power links through panel wire ducts completely separate from low-voltage instrument lines. Connect the outer shield ring of the network coax cables straight to the cabinet's centralized copper earth bus bar to block high-frequency electromagnetic noise fields from corrupting the 100 Mbps digital data frames.