Honeywell 51196990-500 Serial Extension Cable

Technical Dossier

Product Details And Specifications

Honeywell 51196990 Series: Comprehensive Cable Range and Technical Overview

The Honeywell 51196990 series encompasses serial extension cable assemblies engineered for use within Honeywell's distributed control system (DCS) platforms, including the TDC 3000, PlantScape, and Experion PKS architectures. These cables serve as the physical communication backbone between controllers, I/O link modules, data highways, and operator workstations in process-critical environments.

The Evolution of 51196990 Architecture

The 51196990 cable series was introduced alongside Honeywell's TDC 3000 platform in the early 1980s, designed to meet the RS-232/RS-422 serial communication standards prevalent in that era. Early variants used DB-9 and DB-25 connectors with shielded twisted-pair construction to minimize electromagnetic interference in electrically noisy plant environments.

As Honeywell transitioned to the PlantScape platform in the mid-1990s and subsequently to Experion PKS in the 2000s, the cable assemblies were revised to support higher baud rates and longer cable runs. The suffix numbering system (e.g., -100, -200, -500) denotes cable length variants, with -500 indicating a 5-meter assembly. Connector pinouts remained largely backward-compatible across generations, allowing mixed-generation installations to coexist during phased upgrades.

By the 2010s, Honeywell's shift toward Ethernet-based I/O and fiber-optic data highways reduced the role of RS-232/RS-422 serial cables in new installations. However, brownfield sites — particularly those with TDC 3000 systems under long-term service agreements — continued to require 51196990 assemblies for maintenance replacements, making aftermarket availability a critical operational concern.

51196990 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Honeywell 51196990 serial cable series. Each entry reflects a distinct length, connector configuration, or application variant:

51196990-100: Serial extension cable assembly, 1-meter, RS-232/RS-422, shielded, for UCN node interconnect.
51196990-200: Serial extension cable assembly, 2-meter, RS-232/RS-422, shielded, standard rack-to-rack routing.
51196990-300: Serial extension cable assembly, 3-meter, RS-232/RS-422, for extended cabinet spacing.
51196990-400: Serial extension cable assembly, 4-meter, RS-232/RS-422, used in distributed I/O link configurations.
51196990-500: Serial extension cable assembly, 5-meter, RS-232/RS-422, primary variant for operator station to controller wiring.
51196990-600: Serial extension cable assembly, 6-meter, RS-422, for long-run serial data highway segments.
51196990-700: Serial extension cable assembly, 7-meter, RS-422, used in large-footprint control room layouts.
51196990-800: Serial extension cable assembly, 8-meter, RS-422, for cross-room UCN segment extension.
51196990-900: Serial extension cable assembly, 9-meter, RS-422, extended-reach variant for field junction boxes.
51196990-1000: Serial extension cable assembly, 10-meter, RS-422, maximum standard-length variant in the series.
51196990-150: Serial extension cable assembly, 1.5-meter, short-run variant for co-located module pairs.
51196990-250: Serial extension cable assembly, 2.5-meter, intermediate-length for tight cabinet configurations.
51196990-350: Serial extension cable assembly, 3.5-meter, RS-422, for mid-range I/O link wiring.
51196990-450: Serial extension cable assembly, 4.5-meter, RS-422, used in PlantScape migration projects.
51196990-550: Serial extension cable assembly, 5.5-meter, RS-422, Experion PKS compatible serial interface cable.

Quality Control for the 51196990 Range

Visual Inspection: Connector shells, strain reliefs, and cable jacket are examined for mechanical damage, corrosion, and deformation. DB-9 and DB-25 connector pins are checked for bend, oxidation, and seating integrity.

Continuity Testing: Each conductor is verified for end-to-end continuity using a calibrated cable tester. Open circuits and cross-wiring faults are flagged and the unit is rejected.

Insulation Resistance Test: Conductor-to-shield and conductor-to-conductor insulation resistance is measured at 500V DC. Minimum acceptable resistance is 100 MΩ.

Shield Continuity: Drain wire and foil shield continuity is verified from connector shell to connector shell to confirm EMI protection integrity.

Functional Verification (where applicable): For units with available test fixtures, RS-232/RS-422 signal transmission is verified using a serial loopback test at standard baud rates (9600, 19200, 115200 bps).

All tested units are labeled with a DriveKNMS inspection tag, test date, and technician ID before packaging.