ABB YXT115B Series Modules | YXT115B 4890024-NK Basic Control Unit

Technical Dossier

Product Details And Specifications

ABB YXT115B Series: Comprehensive Module Range and Technical Overview

The ABB YXT115B series is a family of Basic Control Units deployed within ABB's Advant/Master and MOD 300 distributed control system (DCS) architectures. These modules occupy a critical role in continuous process industries including petrochemical refineries, nuclear power generation auxiliaries, pulp and paper mills, and offshore oil and gas platforms. The YXT115B platform provides the foundational control logic execution layer, interfacing directly with I/O subsystems, fieldbus adapters, and supervisory SCADA layers. Its ruggedized backplane design and deterministic scan-cycle execution make it a reference standard for installations requiring decades of uninterrupted operation. Global installed base estimates place ABB Advant-family controllers in tens of thousands of process loops across Europe, Asia-Pacific, and the Americas, with many sites maintaining active YXT115B-based control nodes well beyond the original product lifecycle end-date.

The Evolution of YXT115B Architecture

The YXT115B lineage traces to ABB's Advant Controller 400 series platform, introduced in the late 1980s as a modular, rack-mounted DCS solution designed to replace hardwired relay logic in large-scale process plants. Early revisions of the Basic Control Unit operated on a proprietary MasterBus 300 serial backplane at 1 Mbit/s, with deterministic token-passing arbitration ensuring sub-100 ms scan cycles across up to 64 I/O nodes. Mid-generation revisions introduced expanded RAM addressing, allowing larger ladder and function-block programs without external memory expansion boards. The 4890024-NK hardware revision of the YXT115B reflects a mature production build incorporating EMC-hardened oscillator circuits and conformal-coated PCBs rated for industrial ambient temperatures of 0–55 °C. As ABB transitioned its DCS portfolio toward the System 800xA architecture in the 2000s, the YXT115B entered a maintenance-only lifecycle phase. Compatibility bridging between YXT115B nodes and 800xA OPC-DA gateways is achievable via the CI858 PROFIBUS DP adapter, enabling hybrid architectures where legacy control nodes coexist with modern HMI and historian layers. Sites running YXT115B hardware today typically operate under extended lifecycle support agreements, with spare parts sourcing representing the primary operational risk.

YXT115B Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the ABB YXT115B and closely associated Advant/MOD 300 control system ecosystem. Each entry reflects a discrete hardware function within the platform architecture.

YXT115B 4890024-NK: Basic Control Unit, MasterBus 300 backplane, core CPU execution node.
YXT115A 4890024-NJ: Basic Control Unit, prior hardware revision, reduced RAM addressing range.
YXT115C 4890024-NL: Basic Control Unit, enhanced EMC shielding variant for high-interference environments.
DSPC110 57310001-P: Processor module, AC 400 series, 16 MHz CPU, 512 KB SRAM, redundancy-capable.
DSPC172 57310255-AK: Processor module, extended memory, supports large function-block libraries.
DSDP170 57160001-AHF: PROFIBUS DP master adapter, connects YXT115B rack to field device networks.
DSDI110A 57160001-P: Digital Input module, 32-channel, 24 VDC, isolated, for discrete process signals.
DSDO110A 57160001-R: Digital Output module, 32-channel, 24 VDC, solid-state relay outputs.
DSAI130A 57160001-HF: Analog Input module, 16-channel, 4–20 mA / 0–10 V, 12-bit resolution.
DSAO120A 57160001-KF: Analog Output module, 8-channel, 4–20 mA, loop-powered field transmitter drive.
DSTC190 57310001-GD: Thermocouple Input module, 8-channel, J/K/T/E type, cold-junction compensated.
DSRF180 57310001-DF: RTD Input module, 8-channel, Pt100/Pt1000, 3-wire configuration.
DSMB175 57310001-BK: MasterBus 300 communication adapter, node expansion for multi-rack configurations.
DSQC503 3HAC4417-1: Power supply module, 24 VDC regulated, rack-mount, redundant input capable.
DSPOW457 57310001-EF: Redundant power supply unit, hot-swap capable, for high-availability control nodes.
DSCS140 57310001-CF: Communication supervisor module, manages MasterBus token ring arbitration.
DSEI2107 57310001-FF: Serial interface module, RS-232/RS-485, for legacy field device integration.
DSPC400 57310001-GF: High-performance processor card, successor-compatible with YXT115B rack form factor.

Sourcing Hard-to-Find & Obsolete YXT115B Parts

ABB formally discontinued active manufacturing of YXT115B-series Basic Control Units as part of the broader Advant Controller 400 end-of-life program. Replacement with System 800xA hardware requires significant engineering effort, including I/O remapping, function-block migration, and FAT/SAT re-qualification — a process that can span 12–36 months for a mid-size process unit. DriveKNMS maintains a dedicated inventory of tested YXT115B 4890024-NK units and associated Advant-family modules sourced from decommissioned plant assets, OEM overstock, and authorized redistribution channels. All units are catalogued by hardware revision code and firmware version where applicable. For sites operating under ISA-18.2 or IEC 61511 functional safety frameworks, DriveKNMS can provide traceability documentation and test records to support safety case maintenance. Customers requiring long-term supply agreements for multi-year maintenance windows are accommodated with reserved stock allocations. Emergency same-day dispatch is available for critical process restoration scenarios. Contact the procurement team with your full BOM or tag list for availability confirmation and lead-time quotation.

Quality Control for the YXT115B Range

YXT115B Basic Control Units present specific test challenges due to their integrated MasterBus 300 backplane interface logic and onboard SRAM battery-backup circuits. DriveKNMS applies a structured verification protocol to each unit prior to dispatch. Stage 1: Visual inspection under 10× magnification for PCB delamination, capacitor bulge, and solder joint fatigue on high-cycle connector pins. Stage 2: Power-on functional test using an ABB-compatible rack simulator, verifying regulated 5 VDC and 24 VDC rail stability within ±2% tolerance. Stage 3: MasterBus 300 communication loopback test, confirming token-passing arbitration and node address assignment. Stage 4: SRAM data retention test, verifying battery-backed memory holds program data through a simulated power interruption of 72 hours. Stage 5: Thermal soak at 50 °C for 4 hours, confirming no thermal shutdown or clock drift beyond specification. Units failing any stage are quarantined, documented, and either repaired to specification or scrapped. Test records are retained for 7 years and are available to customers on request.

For sourcing inquiries, BOM reviews, and availability confirmation on YXT115B 4890024-NK and all associated Advant-family modules: