Emerson DeltaV KJ Series Modules: KJ4001X2-BE1 12P0818X072 I/O Carrier with Shield Bar

Technical Dossier

Product Details And Specifications

Emerson DeltaV KJ Series Technical Notes

The Emerson DeltaV KJ Series represents one of the most widely deployed distributed control system (DCS) hardware platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, offshore oil platforms, LNG terminals, and pharmaceutical manufacturing facilities, the KJ Series forms the physical backbone of DeltaV process automation architecture. Its modular, carrier-based design allows field engineers to configure I/O subsystems with precision, supporting both legacy 4–20 mA analog instrumentation and modern HART, FOUNDATION Fieldbus, and PROFIBUS field devices. The KJ4001X2-BE1 12P0818X072 I/O Carrier with Shield Bar is a representative component of this ecosystem, providing the mechanical and electrical interface between field wiring and DeltaV I/O modules.

The Evolution of DeltaV KJ Series Architecture

The DeltaV KJ Series was introduced by Fisher-Rosemount (subsequently acquired by Emerson Electric) in the mid-1990s as a scalable, node-based DCS platform designed to replace proprietary, monolithic control systems. The architecture is organized around Electronic Marshalling and traditional I/O subsystems. Early KJ Series hardware used fixed-function carriers and modules with dedicated terminal blocks; subsequent generations introduced the CHARM (Characterization Module) concept, enabling software-defined I/O characterization without hardware rewiring.

Compatibility across generations is a critical operational concern. KJ Series carriers and modules are designed for use within specific DeltaV system versions. Firmware dependencies between controllers (KJ3001X1, KJ3002X1) and I/O modules must be validated before substitution. The transition from Series 1 to Series 2 hardware (denoted by the X2 suffix, as in KJ4001X2-BE1) introduced enhanced EMC shielding, revised backplane connectors, and improved thermal management. Plants operating mixed Series 1 and Series 2 hardware must verify interoperability at the subsystem level.

DeltaV KJ Series Full Catalog & Functionalities (SKU List)

Controllers & CPUs

• KJ3001X1-BA1: DeltaV MD Controller, Series 1, standard process control node
• KJ3002X1-BA1: DeltaV MD Plus Controller, Series 1, enhanced memory and I/O capacity
• KJ3003X1-BA1: DeltaV SD Controller, simplex configuration, entry-level node
• KJ3221X1-BA1: DeltaV MD Controller with redundancy support, Series 1

I/O Carriers & Marshalling Hardware

• KJ4001X2-BE1 12P0818X072: 8-channel I/O Carrier with Shield Bar, Series 2 — the subject of this listing; provides field wiring termination and EMC shielding for standard I/O modules
• KJ4001X1-BE1: 8-channel I/O Carrier, Series 1, predecessor to the X2 variant
• KJ4002X1-BA1: 16-channel I/O Carrier, Series 1, high-density marshalling
• KJ4003X1-BA1: Intrinsically Safe I/O Carrier, ATEX/IECEx rated, for Zone 1 hazardous areas
• KJ4005X1-BA1: CHARM I/O Carrier, supports Characterization Modules for software-defined I/O

Analog Input (AI) Modules

• KJ4011X1-BA1: 8-channel Analog Input, 4–20 mA / HART, Series 1
• KJ4011X2-BA1: 8-channel Analog Input, 4–20 mA / HART, Series 2, enhanced diagnostics
• KJ4012X1-BA1: 8-channel Analog Input, RTD/Thermocouple, multi-sensor type

Analog Output (AO) Modules

• KJ4021X1-BA1: 8-channel Analog Output, 4–20 mA / HART, Series 1
• KJ4021X2-BA1: 8-channel Analog Output, 4–20 mA / HART, Series 2

Digital Input (DI) Modules

• KJ4031X1-BA1: 8-channel Digital Input, 24 VDC, Series 1
• KJ4031X2-BA1: 8-channel Digital Input, 24 VDC, Series 2, improved noise immunity

Digital Output (DO) Modules

• KJ4041X1-BA1: 8-channel Digital Output, 24 VDC, Series 1
• KJ4041X2-BA1: 8-channel Digital Output, 24 VDC, Series 2

Communication & Network Adapters

• KJ4110X1-BA1: FOUNDATION Fieldbus H1 Interface Module, 2-segment
• KJ4120X1-BA1: PROFIBUS DP Interface Module, multi-drop field network

Power Supplies

• KJ4700X1-BA1: DeltaV I/O Power Supply, 24 VDC, standard rail-mount
• KJ4701X1-BA1: DeltaV Redundant Power Supply Module, hot-swap capable

Sourcing Hard-to-Find & Obsolete DeltaV KJ Series Parts

The DeltaV KJ Series has entered a mature-to-declining lifecycle phase. Emerson has progressively migrated its installed base toward the DeltaV S-Series and CHARM-based Electronic Marshalling architecture. As a result, a significant portion of KJ Series hardware — particularly Series 1 variants (X1 suffix) — is no longer manufactured and must be sourced from the secondary market or specialist distributors.

DriveKNMS maintains a dedicated inventory of KJ Series spare parts to support lifecycle extension programs for plants that cannot justify a full DCS migration. Our sourcing capabilities include:

Plants operating KJ Series hardware beyond Emerson's published end-of-life dates should establish a strategic spare parts buffer. DriveKNMS can assist with bill-of-materials (BOM) analysis and recommended stocking levels based on installed module counts and historical failure rates.

Quality Control for the DeltaV KJ Series Range

KJ Series modules present specific test challenges due to their backplane-dependent communication architecture and multi-channel I/O design. DriveKNMS applies the following verification procedures to all KJ Series inventory:

• Backplane continuity test: All carrier connectors (including the shield bar interface on KJ4001X2-BE1 variants) are tested for pin integrity and contact resistance using a dedicated DeltaV carrier test fixture.
• Module functional test: Each I/O module is installed in a live DeltaV test node running a validated firmware version. All channels are exercised across the full input/output range (0–20 mA for analog, 0/24 VDC for digital).
• HART communication verification: HART-capable modules are tested with a HART communicator to confirm secondary variable pass-through and device descriptor (DD) compatibility.
• Thermal cycling: Modules flagged as refurbished undergo a 24-hour thermal soak at operating temperature to screen for latent component failures.
• Firmware version logging: The firmware revision of each controller and I/O module is recorded and disclosed to the buyer prior to shipment.