ABB TB842 3BSE022464R1 Modules - NDBU-95C 64008366D

Name: ABB TB842 3BSE022464R1 Modules - NDBU-95C 64008366D
Brand: ABB

Model: NDBU-95C 64008366D

Brand ABB

Series TB842 3BSE022464R1

Model NDBU-95C 64008366D

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Technical Dossier

Product Details And Specifications

ABB TB842 Series Technical Notes

The Evolution of TB842 Architecture

The S800 I/O system was introduced by ABB in the mid-1990s as the field I/O layer for the Advant OCS and later the AC800M DCS platform. The TB842 termination unit belongs to the first-generation S800 I/O hardware family, which established a standardized backplane bus (ModuleBus) for communication between I/O modules and the controller. Early S800 hardware (circa 1996–2002) used parallel ModuleBus architecture with dedicated termination boards per module type. The TB842 is compatible with AI810 (8-channel, 4–20 mA / 1–5 V) and AI820 (8-channel HART-enabled) analog input modules.

From 2003 onward, ABB introduced the S800 I/O L series with enhanced EMC shielding and extended temperature ratings, while maintaining backward compatibility with existing TB8xx termination units. The TB842 remained unchanged in its electrical interface, ensuring that field wiring installed in the 1990s could be retained during controller upgrades to AC800M v5.x and v6.x firmware generations. As of 2020, the S800 I/O hardware line entered a mature/end-of-active-development phase. ABB continues to supply spare parts and provide lifecycle extension support, but new installations are directed toward the S900 I/O platform. For existing plants, the TB842 remains a long-term maintenance item with a projected support horizon through 2030+ under ABB's Extended Lifecycle Program.

TB842 / S800 I/O Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the ABB S800 I/O ecosystem. Each is compatible with the AC800M controller family and shares the ModuleBus backplane architecture.

Termination Units (TB8xx Series)

TB820 / 3BSE013208R1: ModuleBus Modem, single-slot termination for standard I/O modules
TB840 / 3BSE037760R1: Termination Unit for AI810, passive 8-ch analog input wiring board
TB842 / 3BSE022464R1: Termination Unit for AI810/AI820, field-side screw terminal block, DIN-rail mount
TB845 / 3BSE021437R1: Termination Unit for AO810/AO820, 8-ch analog output passive termination
TB846 / 3BSE022460R1: Termination Unit for DI810/DI811, 16-ch digital input passive wiring board
TB850 / 3BSE023607R1: Termination Unit for DO810/DO814, 16-ch digital output passive termination
TB851 / 3BSE023608R1: Termination Unit for DO815, relay output passive termination board
TB852 / 3BSE018161R1: Termination Unit for DI890/DO890, high-density I/O passive board

Analog Input Modules (AI8xx Series)

AI810 / 3BSE008516R1: 8-channel analog input, 4–20 mA / 1–5 V, single-ended, S800 ModuleBus
AI820 / 3BSE008544R1: 8-channel analog input with HART protocol support, 4–20 mA
AI830 / 3BSE008546R1: 8-channel thermocouple/RTD input, multi-type sensor support
AI835 / 3BSE008548R1: 8-channel RTD input, Pt100/Pt1000, 3-wire configuration

Analog Output Modules (AO8xx Series)

AO810 / 3BSE008522R1: 8-channel analog output, 4–20 mA, single-ended, S800 ModuleBus
AO820 / 3BSE008550R1: 8-channel analog output with HART protocol, 4–20 mA

Digital Input Modules (DI8xx Series)

DI810 / 3BSE008508R1: 16-channel digital input, 24 VDC, sink/source configurable
DI811 / 3BSE008510R1: 16-channel digital input, 120 VAC, optically isolated
DI814 / 3BSE008512R1: 16-channel digital input, 48 VDC, high-density format

Digital Output Modules (DO8xx Series)

DO810 / 3BSE008514R1: 16-channel digital output, 24 VDC, 0.5 A per channel
DO814 / 3BSE008518R1: 16-channel digital output, 24 VDC, high-current 2 A per channel
DO815 / 3BSE013258R1: 8-channel relay output, SPDT, 250 VAC / 5 A rated contacts

Quality Control for the TB842 / S800 I/O Range

Termination units such as the TB842 are passive assemblies; however, failure modes include corroded screw terminals, cracked PCB traces at field-wiring connection points, and degraded backplane connector pins from repeated module insertion cycles. DriveKNMS applies the following inspection protocol to all S800 I/O hardware prior to shipment:

Visual inspection of all 40-pin backplane connectors under 10× magnification for pin deformation or oxidation
Continuity verification across all field terminal blocks using calibrated milliohm meter (target: <0.5 Ω per terminal path)
Insulation resistance test between signal channels and chassis ground (minimum 100 MΩ at 500 VDC)
Dimensional check of DIN-rail mounting clips for retention force compliance
Functional loop test with paired AI810 module and AC800M simulator where test bench availability permits

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