Emerson DeltaV MD Plus Modules: KJ2003X1-BB1 12P3439X032

Technical Dossier

Product Details And Specifications

Emerson DeltaV MD Plus Series Technical Notes

The Emerson DeltaV MD Plus series represents a mature, widely deployed distributed control system (DCS) platform with a substantial installed base across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore oil & gas platforms, and large-scale chemical processing plants. The MD Plus controller generation succeeded the original MD controller and introduced expanded I/O capacity, enhanced redundancy options, and improved deterministic scan cycle performance. Its backplane architecture supports hot-swap module replacement without process interruption, a critical requirement in continuous-operation facilities. The DeltaV MD Plus platform operates within the broader DeltaV S-series ecosystem and remains one of the most referenced controller families in long-cycle industrial maintenance catalogs globally.

The Evolution of DeltaV MD Plus Architecture

The DeltaV control system was introduced by Fisher-Rosemount (later acquired by Emerson Electric) in the mid-1990s as a scalable, node-based DCS designed to replace legacy proprietary systems. The original MD (Multi-Drop) controller established the foundational backplane and I/O bus architecture. The MD Plus generation extended this architecture with a 64 MB RAM baseline, dual-port Ethernet controller network interface, and support for up to 750 I/O points per controller node. The MD Plus introduced the KJ2003 controller card family, which became the standard controller module across thousands of installations worldwide.

Subsequent generations—the MD Plus Controller with redundancy kit (KJ2003X1-BB1 paired with KJ2003X1-BA1), the MQ controller, and eventually the PK controller—maintained backward compatibility with the DeltaV I/O subsystem, allowing facilities to upgrade controller hardware without replacing field wiring or I/O marshaling cabinets. As of 2026, the MD Plus series has entered the end-of-active-production phase, with Emerson directing new projects toward the DeltaV PK and DeltaV Compact controllers. However, the MD Plus remains in active service at a large number of brownfield sites, creating sustained demand for spare parts, repair services, and lifecycle extension support.

DeltaV MD Plus Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked components within the DeltaV MD Plus ecosystem. Each entry reflects a distinct hardware function within the system architecture.

Controllers

• KJ2003X1-BB1 12P3439X032: MD Plus Controller Module, 750 I/O capacity, dual Ethernet, redundancy-capable primary node card.
• KJ2003X1-BA1: MD Plus Redundant Controller Module, secondary node card for 1:1 controller redundancy configurations.
• KJ2003X1-BC1: MD Plus Controller with extended firmware revision, compatible with DeltaV v11.x and later.
• KJ2003X1-BD1: MD Plus Controller Module, factory-configured for SIS (Safety Instrumented System) integration.

Digital Input (DI) Modules

• KJ3001X1-BA1: 8-channel 24 VDC Digital Input module, isolated, DIN-rail mountable I/O card.
• KJ3001X1-BB1: 8-channel 120 VAC Digital Input module, field-side isolated, HART-transparent.
• KJ3002X1-BA1: 16-channel 24 VDC Digital Input module, non-isolated, high-density I/O subsystem card.

Digital Output (DO) Modules

• KJ3221X1-BA1: 8-channel 24 VDC Digital Output module, sourcing type, 0.5 A per channel rated.
• KJ3221X1-BB1: 8-channel relay Digital Output module, SPDT contacts, 2 A resistive load per channel.
• KJ3222X1-BA1: 16-channel 24 VDC Digital Output module, sinking type, short-circuit protected.

Analog Input (AI) Modules

• KJ3101X1-BA1: 8-channel 4–20 mA Analog Input module, HART-enabled, 16-bit resolution.
• KJ3101X1-BB1: 8-channel thermocouple/RTD Analog Input module, multi-sensor type, cold junction compensated.
• KJ3102X1-BA1: 16-channel 4–20 mA Analog Input module, non-isolated, high-density marshaling configuration.

Analog Output (AO) Modules

• KJ3301X1-BA1: 8-channel 4–20 mA Analog Output module, HART pass-through, 750 Ω loop compliance.
• KJ3302X1-BA1: 4-channel 4–20 mA Analog Output module, isolated per channel, SIS-rated variant available.

Power & Backplane

• KJ1501X1-BA1: MD Plus 8-slot I/O Carrier, horizontal mount, DIN-rail or panel installation.
• KJ1501X1-BB1: MD Plus 12-slot I/O Carrier, extended capacity backplane for high-density nodes.
• KJ4001X1-BA1: DeltaV Power Supply Module, 24 VDC output, 10 A, redundancy-capable with load-sharing diode.

Communications

• KJ4009X1-BA1: DeltaV PROFIBUS DP Interface Module, master class 1, up to 125 field devices per segment.
• KJ4009X1-BB1: DeltaV FOUNDATION Fieldbus H1 Interface Module, 2-segment, intrinsically safe barrier compatible.

Quality Control for the DeltaV MD Plus Range

DeltaV MD Plus modules present specific testing challenges due to their integrated backplane bus communication protocol and the proprietary DeltaV controller network (CTLR NET) interface. DriveKNMS applies the following verification procedures to all MD Plus hardware prior to dispatch:

• Visual inspection for backplane connector pin integrity, capacitor condition, and conformal coating status.
• Functional power-on test using a DeltaV-compatible test bench with active controller network simulation.
• Firmware version verification and documentation against the customer's declared DeltaV software revision.
• HART communication loop test for all AI/AO modules using a calibrated HART communicator.
• Burn-in cycle: 48-hour continuous operation at rated load prior to shipment for controller modules.
• Final packaging in ESD-shielded bags with desiccant, compliant with IEC 61340-5-1 handling standards.