ABB S800 I/O Modules DO801 DO801-eA 3BSE020510R2

Technical Dossier

Product Details And Specifications

ABB S800 I/O Series Technical Notes

The ABB S800 I/O system is a distributed I/O platform engineered for integration with ABB's AC 800M controller family and the System 800xA Distributed Control System (DCS). Deployed across continuous-process industries — including petrochemical refineries, nuclear power generation, pulp and paper plants, and offshore oil & gas platforms — the S800 I/O series represents one of the most widely installed modular I/O architectures in heavy industry globally. Its modular backplane design, redundancy support, and PROFIBUS DP / Modulebus communication backbone have made it the reference standard for process automation projects requiring high channel density, deterministic scan times, and long-term vendor support commitments. The DO801 (3BSE020510R2) is a 32-channel 24 VDC digital output module within this ecosystem, designed for direct load switching in field device control loops.

The Evolution of S800 I/O Architecture

The S800 I/O platform was introduced alongside ABB's Advant OCS and later fully integrated into the System 800xA environment. Early generations used the S800 Modulebus as the primary backplane communication protocol, a proprietary high-speed serial bus that allowed deterministic data exchange between I/O modules and the AC 800M CPU. Over successive hardware revisions, ABB introduced the S800L (low-cost variant for non-redundant applications) and the S800 I/O with PROFIBUS DP interface, enabling third-party DCS integration. The transition from first-generation modules (e.g., AI810, DI810) to enhanced variants (e.g., AI835A, DI885) introduced HART pass-through capability, extended temperature ratings, and improved EMC compliance per IEC 61000. Modules in the original S800 range — including the DO801 — are now in the mature/end-of-active-production phase. ABB continues to provide spare parts and repair services, but new project specifications increasingly reference the S900 I/O platform. For installed base maintenance, the DO801 and its contemporaries remain critical long-term maintenance items.

S800 I/O Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the ABB S800 I/O series. Each entry is classified by functional category.

Digital Output Modules

• DO801 / 3BSE020510R2: 32-channel 24 VDC digital output, 0.5 A per channel, Modulebus interface
• DO802 / 3BSE022364R1: 16-channel relay output module, 2 A per channel, SPDT contacts
• DO810 / 3BSE008510R1: 8-channel 24 VDC digital output, 2 A per channel, individually fused
• DO820 / 3BSE008514R1: 8-channel 24 VDC digital output with diagnostics, short-circuit detection

Digital Input Modules

• DI801 / 3BSE020508R1: 32-channel 24 VDC digital input, Modulebus, 3 ms filter time
• DI802 / 3BSE022360R1: 16-channel 24 VDC digital input, high-density format
• DI810 / 3BSE008508R1: 8-channel 24 VDC digital input, individually isolated
• DI820 / 3BSE008512R1: 8-channel 24 VDC digital input with diagnostics and line monitoring
• DI885 / 3BSE028610R1: 8-channel digital input, HART-enabled, SIL 2 rated

Analog Input Modules

• AI810 / 3BSE008516R1: 8-channel analog input, 4–20 mA / 0–10 V, 12-bit resolution
• AI820 / 3BSE008544R1: 8-channel analog input with HART pass-through, 4–20 mA
• AI835A / 3BSE051306R1: 8-channel analog input, HART 7, redundancy-capable, 16-bit
• AI845 / 3BSE023675R1: 8-channel analog input, high-accuracy, ±0.1% full scale

Analog Output Modules

• AO810 / 3BSE008522R1: 8-channel analog output, 4–20 mA, 12-bit resolution
• AO820 / 3BSE008546R1: 8-channel analog output with HART pass-through, 4–20 mA
• AO845A / 3BSE045584R1: 8-channel analog output, HART 7, redundancy-capable, 16-bit

Communication & Power Modules

• TB820V2 / 3BSE013208R1: Modulebus optical port unit, redundant media interface
• SA811F / 3BSE018165R1: S800 I/O power supply unit, 24 VDC, 3 A output
• BC810 / 3BSE021455R1: S800 I/O cluster modem, PROFIBUS DP interface adapter

Sourcing Hard-to-Find & Obsolete S800 I/O Parts

The DO801 and a significant portion of the original S800 I/O catalog have transitioned out of ABB's active production schedule. For plant operators running System 800xA or Advant OCS installations with 10–25 year operational horizons, sourcing replacement modules through the standard distribution channel is no longer reliable. DriveKNMS maintains a dedicated inventory of S800 I/O spare parts — including first-generation modules, discontinued backplane accessories, and hard-to-find communication adapters — sourced from decommissioned plant equipment, factory overstock, and authorized repair channels. All units are catalogued by part number, hardware revision, and firmware version where applicable. For obsolete modules with no direct ABB replacement, DriveKNMS provides cross-reference analysis to identify compatible substitutes within the S800 or S900 I/O range, minimizing engineering rework for the end user.

Quality Control for the S800 I/O Range

S800 I/O modules present specific test challenges due to their Modulebus backplane protocol and multi-channel parallel I/O architecture. DriveKNMS applies a structured verification process for all S800 units prior to dispatch. Digital output modules such as the DO801 are tested under resistive load at rated current (0.5 A per channel) across all 32 channels simultaneously, with short-circuit protection response time verified against ABB specification. Analog modules are calibrated using traceable reference instruments, with linearity and offset error measured at 0%, 25%, 50%, 75%, and 100% of full scale. HART communication integrity is verified on all HART-capable modules using a calibrated HART modem. Modulebus communication is validated using an AC 800M controller in loopback configuration. Each unit is issued a test record documenting channel-level results, and units are shipped with original or equivalent connector hardware.