ABB TK801V012 3BSC950089R3 ModuleBus Extension Cable

The ABB 3BSC950089R3, also cataloged as the TK801V012 ModuleBus Extension Cable, operates as a dedicated hardware component for extending the electrical backplane bus across separate DIN rails within ABB S800 I/O systems. Used in conjunction with TB805/TB845 and TB806/TB846 bus optical port / extension modules, the cable provides physical signal continuity to interconnect distributed I/O clusters on a single electrical bus node.

Hardware Specifications

Backplane Bus Communication Velocity & I/O Density Scaling

The TK801V012 extension cable maintains standard backplane bus communication velocity across split DIN-rail configurations, permitting seamless I/O density scaling within a unified S800 I/O cluster. Internal shielding and verified impedance matching preserve high-frequency signal integrity between the master station module and downstream I/O bases, preventing packet dropouts or communication timing faults across the 1.2 m interface distance.

Frequently Asked Questions

Q: Which termination or bus interface modules are required to connect the TK801V012 cable?

A: The cable requires connection to TB805 or TB845 on the originating ModuleBus rail and TB806 or TB846 on the target extension rail.

Q: Does the TK801V012 cable support hot-swapping or live disconnection during operation?

A: Disconnecting the extension cable during operation breaks the electrical ModuleBus, causing immediate loss of communication to all downstream I/O modules; the cable must remain locked during rack operation.

Q: Does the cable require external power or driver hardware?

A: No, the assembly is a passive multi-conductor shielded cable that directly routes power rails and high-speed data lines between ModuleBus interface blocks.

Field Installation Guidelines

• De-energize the host I/O station backplane before mating or disconnecting the extension cable assembly.
• Route the cable along dedicated wire trays, avoiding tight bend radiuses below the manufacturer standard to prevent internal wire strain.
• Ensure both cable connectors are aligned correctly with the socket pins on the TB805/TB845 and TB806/TB846 interface blocks before pushing into place.
• Secure the integrated connector locking clips firmly to ensure continuous chassis earth shield grounding across the cable assembly.
• Keep the cable separate from high-voltage motor feeds and AC distribution wiring to avoid electromagnetic noise coupling onto the ModuleBus signal lines.