ABB 087629-001 Interface PC Board – 16 MHz Processor, RS-485 & Parallel Bus, Conformal Coated

Technical Specifications

Main Features and Advantages

Purpose-built for sensor-frontend integrity: The ABB 087629-001​ is not a generic CPU board—it is tuned for mV-level analog acquisition off nuclear/IR sensor heads on a moving scan carriage. The analog front-end op-amps and A/D pipeline are laid out to reject the 50/60 Hz hum, variable-speed drive noise, and ground-loop offsets typical of a paper-machine drive aisle. For a basis-weight loop running at sub-0.5% CV, that low-noise floor is the difference between stable reel building and chronic MD/CD profile chatter.16-bit compute with deterministic firmware: The onboard 16 MHz / 512 KB RAM combo may look modest by modern PLC standards, but within the AccuRay 4200/5200 context it is deliberately cycle-bound—the firmware’s scanning, filtering, and cross-direction profiling math runs in locked step with the carriage traversal. Swapping in the ABB 087629-001​ preserves that timing; a repaired or cloned board with different wait-state behavior can desynchronize the slice clock and manifest as “profile drift” that takes days to diagnose.Environmental hardening for the wet end: Paper-machine QCS rooms are hot, humid, and mildly corrosive (lime dust, chlorine, coating mist depending on grade). The ABB 087629-001​ carries conformal coating on the PCB surface as standard AccuRay practice, plus over-current, short-circuit, and watchdog timer protection. If a scanner-head cable gets nicked and shorts a channel, the watchdog forces a controlled reset rather than letting the board hang and flood the backplane with garbage data—this containment behavior protects both the 087629-001​ itself and the upstream AccuRay supervisor.Drop-in AccuRay compatibility: For MRO teams on 4200/5200/6200 frames, the ABB 087629-001​ is the “unplug old, plug new, reboot, done” spare. No parameter file migration, no backplane re-pin, no firmware download required if the replacement carries the same label revision. That plug-and-play attribute directly shrinks MTTR during an unplanned scanner fault—critical when the reel is building and every minute of lost QCS data widens the off-spec roll.Architectural note on SR511 labeling: Dealers sometimes list the ABB 087629-001​ under “SR511 PC Board” because it shares the SR511 internal-platform mechanics with the Advant OCS world, but buyers should confirm: if you need the 24 V → 5 V redundant regulator (SR511 3BSE000863R1, 35 A), that is a completely different SKU. The 087629-001​ is the AccuRay signal board; the SR511 regulator is the Advant/OCS power board. Mixing these up is the single most common misorder on this part family.

Application Field

The ABB 087629-001​ lives almost exclusively inside pulp & paper machine QCS scanning systems. Its primary deployment is the AccuRay 4200, 5200, and 6200 scanning frames that traverse the web after the press section, dryer section, or size press—mounting beta gauges for basis weight, IR or microwave for moisture, XRF for ash, and caliper heads for thickness. As the scanner carriage shuttles CD (cross-direction), the sensors stream raw analog back to the frame’s electrical nacelle, where the ABB 087629-001​ conditions, digitizes, and packages those channels for the AccuRay main computer. If this board drifts or fails, the operator sees it as frozen profiles, stepped offsets on MD trend, or “sensor comms lost” alarms—any of which can force a grade change or reel bump.Beyond paper, the same SR511-platform PCB architecture appears in board machines, tissue lines, and specialty coaters where ABB AccuRay was specified in the 1990s–2000s era. In all cases the plant is running a brownfield system where a full QCS replacement (scanning frame + sensors + computers) is capital-heavy, so the pragmatic path is spare-board inventory. The 087629-001​ also shows up in adjacent Advant OCS / S100 rack discussions because ABB’s SR511 internal-mechanics span both AccuRay and Advant worlds, though the functional role diverges—AccuRay = signal processing, Advant = 24→5 V regulation.For maintenance planners, the ABB 087629-001​ is a textbook “insurance spare.” Paper mills typically stock one per machine aisle because the scan frame is a single point of visibility into the sheet—lose it and you’re running blind on basis weight until it’s back. Since ABB has moved AccuRay 4200/5200 into spare-only / legacy status in many regions, lead times on the 087629-001​ can stretch; proactive MRO buys beat emergency sourcing every time. In retrofit scenarios where a mill is upgrading the AccuRay computer but keeping the scanner carriage and sensors, verifying the ABB 087629-001​ label revision against the new QCS software rev is part of the pre-cutover checklist—firmware handshake between this board and the supervisor matters.