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Honeywell 51190782-200

Product Overview
The Honeywell 51190782-200 is a UCN (Universal Control Network) carrier band terminator used in Honeywell TDC 3000 distributed control systems. It is installed at the physical end of a UCN carrier-band coaxial cable segment to provide the correct impedance termination, ensuring signal integrity across the deterministic control network that connects C300 controllers, PM/APM/HPM process managers, and other UCN nodes. The “wo/chain” suffix indicates that this variant is supplied without the chain-type mounting hardware, distinguishing it from chained terminator assemblies.
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Detailed content

Technical Specifications
  • Manufacturer: Honeywell
  • Part Number: 51190782-200
  • Product Type: UCN Carrier Band Terminator
  • Configuration: Without chain (wo/chain)
  • Network Compatibility: Universal Control Network (UCN)
  • Cable Interface: 75 Ω coaxial carrier band (RG-11 / RG-6 class UCN trunk and drop cables)
  • Typical Impedance Matching: 75 Ω terminating load for UCN carrier-band coaxial runs
  • System Platform: TDC 3000, Experion PKS (C300 node integration)
  • Origin: United States
📌 Note: Detailed published electrical ratings, physical dimensions, and material composition for this specific spare-part variant are not separately released in Honeywell’s general public catalog. The terminator is specified and supplied as a matched UCN impedance device within the TDC 3000 / Experion UCN architecture.
Functional Features
  • Provides precise 75 Ω impedance matching at the end of a UCN carrier-band coaxial segment to prevent signal reflection and data corruption
  • Ensures deterministic, high-reliability communication between UCN nodes (C300 controllers, PM/APM/HPM, NIM)
  • “Without chain” variant offers flexible mounting for cabinets where chained hardware is not required
  • Engineered as a direct replacement for installed TDC 3000 systems, including paper mills, power plants, steel plants, petrochemical, and printing industry DCS cabinets
Working Principle
In a UCN carrier-band coaxial network, signal transmission follows controlled-impedance RF practice. The 51190782-200 terminator closes the physical end of the coaxial segment with a matched 75 Ω load. Without proper termination, high-frequency UCN packets reflect back along the cable, causing bit errors, node drops, and control determinism loss. By absorbing the incident signal energy, the terminator maintains clean signal edges and stable network timing across the entire carrier-band segment.
System Compatibility
  • Honeywell TDC 3000 (UCN architecture)
  • Honeywell Experion PKS with C300 controllers operating on UCN
  • Compatible with UCN trunk cable sets (e.g., 51195199 series RG-11 cables) and UCN drop cable sets (e.g., 51195153 series RG-6 cables)
  • Pairs with UCN tee connectors (e.g., 51190728-105) and UCN fiber-optic extension kits (e.g., 51197564-200) for hybrid copper/fiber UCN topologies
Application Scenarios
  • End-of-line termination for UCN carrier-band coaxial runs in large-scale process automation
  • Petroleum, chemical, and pharmaceutical plant DCS networks requiring deterministic controller-to-controller communication
  • Power generation and steel/paper mill TDC 3000 retrofits and spare-part replacement
  • Any industrial site running Honeywell UCN-based process control where signal integrity and network uptime are critical
Installation Requirements
  • Install strictly at the physical end of a UCN carrier-band coaxial segment; never place in the middle of a run
  • Use with 75 Ω UCN coaxial cabling (RG-11 for trunk, RG-6 for drops) to maintain impedance continuity
  • Ensure correct BNC or threaded coaxial connector engagement with the UCN tap or tee connector
  • For “wo/chain” variant: secure the terminator body to the cabinet panel or DIN rail using appropriate stand-off hardware to avoid mechanical stress on the coaxial connector
  • Verify that exactly two terminators exist per UCN carrier-band segment (one at each physical end) — a missing or absent terminator will cause network faults
Usage Notes
  • This is a passive impedance-matching device; it has no configurable settings and does not require power
  • Inspect the coaxial connector for dust, oxidation, or mechanical damage before installation — a poor contact degrades UCN signal quality
  • Do not substitute with generic 75 Ω terminators not qualified by Honeywell; non-matched VSWR characteristics can introduce subtle packet loss
  • When servicing an existing TDC 3000 cabinet, confirm the installed UCN topology (chain vs. non-chain) before ordering — the 51190782-100 is the chained variant, while 51190782-200 is the without-chain variant
  • Store in a dry, static-free environment; although the device is passive, connector plating integrity should be preserved prior to installation
  • Replacement is straightforward: remove the faulty terminator from the coaxial end and fit the new 51190782-200, then verify UCN node communications via the Experion PKS / TDC 3000 diagnostic console

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