ABB YXT115B 4890024-NK Basic Control Unit

Technical Dossier

Product Details And Specifications

ABB YXT115B Series Technical Notes

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.