ABB TB806 3BSE008536R1 S800 Modulebus Extension Adaptor

The ABB TB806 3BSE008536R1, also cataloged as the TB806 Bus Inlet Adaptor, operates as a dedicated hardware component for extending physical backplane communications within ABB S800 I/O and System 800xA control platforms. Positioned at the boundary of a local I/O cluster, this unit converts internal Modulebus backplane signals to a DB25 male interface, enabling multi-rack connection via TK801 extension cables across distributed enclosure configurations.

Hardware Specifications

Backplane Bus Communication Velocity and Signal Integrity

By providing direct electrical pin mapping to DB25 twisted-pair conductors, the TB806 maintains backplane bus communication velocity across extended S800 I/O sub-clusters. The hardware layout minimizes signal attenuation and parasitic capacitance during high-speed serial bit transitions across external TK801 cabling. This mechanical interface preserves differential line balance, allowing remote I/O bases to maintain deterministic timing synchronization with the central field communication interface.

Frequently Asked Questions

Q: What cable is required to connect the TB806 Bus Inlet Adaptor to an extension rack?

A: The TB806 utilizes a DB25 connection specifically wired for integration with an ABB TK801 Modulebus extension cable assembly.

Q: Is external 24 VDC auxiliary power required for the TB806 adaptor?

A: No. The TB806 is a passive interconnect interface that forwards bus communication signals directly through its DB25 pin array without requiring external DC power.

Q: How many TB806 adaptors are required per extension cable branch?

A: Exactly one TB806 Bus Inlet unit is required at the receiving end of each TK801 extension cable run to adapt backplane signals into the next I/O sub-cluster.

Field Installation Guidelines

Ensure main panel power and I/O backplane supplies are switched off prior to attaching or disconnecting backplane expansion adaptors. Align the TB806 connector straight onto the target Modulebus interface slot, pressing firmly to ensure complete contact insertion.

Secure the DB25 connector housing on the TK801 cable to the TB806 jack-screws to prevent physical separation under industrial vibration. Maintain minimum bend radii on all DB25 interconnect cables and avoid routing extension lines alongside high-voltage AC motor drives or heavy inductive switching loads.