ABB TK801 Modulebus Extension Cables: TK801V003

Technical Dossier

Product Details And Specifications

ABB TK801 Modulebus Series Technical Notes

The ABB TK801 Modulebus cable family is the physical interconnect infrastructure for ABB's AC800M Distributed Control System (DCS) platform — one of the most extensively deployed process automation architectures in global heavy industry. AC800M controllers and their associated Modulebus cabling are installed across petrochemical complexes, nuclear power stations, offshore oil platforms, pulp and paper mills, and large-scale water treatment facilities. The Modulebus backplane communication standard defines how S800 I/O modules, communication interfaces, and power supply units exchange data with PM8xx series controllers. The TK801V003 is a 0.3 m Modulebus Extension Cable used to physically extend the Modulebus segment between an S800 I/O station and its associated controller or between adjacent I/O clusters, enabling flexible rack layout in large cabinet installations.

The Evolution of TK801 Modulebus Architecture

The Modulebus standard was introduced alongside the AC800M controller family in the late 1990s as ABB's successor to the earlier Masterbus and RCOM communication layers used in the MOD 300 and Master DCS platforms. The original Modulebus operated as a proprietary serial backplane bus, optimized for deterministic, low-latency I/O scanning in safety-critical process environments. Early deployments used rigid backplane connectors; the introduction of flexible extension cables in the TK801 series allowed engineers to distribute I/O modules across multiple DIN-rail mounted clusters within the same cabinet or across adjacent enclosures without requiring additional communication adapters.

TK801 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified TK801 Modulebus cable and interconnect range within the ABB S800 / AC800M ecosystem. Each entry reflects a distinct part number with a defined functional role.

TK801V001: Modulebus extension cable, 0.1 m, short-span rack-to-rack connection
TK801V003: Modulebus extension cable, 0.3 m, standard inter-cluster cabinet extension
TK801V006: Modulebus extension cable, 0.6 m, long-reach intra-cabinet segment bridge
TK801V012: Modulebus extension cable, 1.2 m, cross-cabinet Modulebus segment
TK801V030: Modulebus extension cable, 3.0 m, remote I/O cluster connection
TK801F001: Modulebus fiber optic extension, 1 m, electrically isolated short segment
TK801F010: Modulebus fiber optic extension, 10 m, long-distance isolated link
TK801F050: Modulebus fiber optic extension, 50 m, inter-building I/O segment extension
TB820V2: Modulebus optical port unit, S800 I/O cluster interface adapter
TB840A: Modulebus optical port unit, redundant configuration, dual-port
TB807: S800 I/O cluster power supply, 24 VDC, Modulebus-compatible rail
TB811: S800 I/O cluster power supply, 120/230 VAC input, Modulebus rail
CI801: PROFIBUS DP communication interface, S800 Modulebus slot
CI810B: AF100 fieldbus communication interface, Modulebus-mounted
CI820V1: PROFINET IO device interface, S800 I/O station, Modulebus
CI830: DeviceNet communication interface, S800 Modulebus slot
CI840A: AF100 redundant fieldbus interface, dual-channel Modulebus
SD821: S800 I/O power distribution unit, Modulebus segment supply
SD822: S800 I/O redundant power distribution, dual-feed Modulebus rail

Quality Control for the TK801 Range

TK801 Modulebus cables and backplane interconnects are subject to a defined inspection protocol at DriveKNMS before any unit is released for shipment. Physical inspection covers connector housing integrity, locking tab condition, and shielding braid continuity. Electrical testing verifies signal path resistance and confirms the absence of inter-conductor shorts. For fiber optic Modulebus extensions (TK801F001, TK801F010, TK801F050), optical insertion loss is measured using a calibrated OTDR to confirm compliance with ABB's specified attenuation budget for the relevant segment length.