ABB TU835V1 3BSE013236R1 Extended Module Termination Unit

The ABB TU835V1, also cataloged as the 3BSE013236R1 Extended Module Termination Unit, operates as a dedicated hardware component for field signal termination and fused transducer power distribution within ABB S800 I/O platforms. Supporting up to 8 analog input channels rated at 50 V and 2 A per channel, the unit provides direct connection points for AI810, AI815, and AI845 modules. The termination unit routes ModuleBus signals to the attached module while shifting position signals to derive the correct hardware address for the next adjacent MTU on the DIN rail.

Hardware Specifications

Backplane Bus Communication Velocity and Mechanical Keying

The TU835V1 passes high-speed ModuleBus lines across the backplane without signal attenuation, maintaining fast communication loops across all connected S800 I/O modules. Positional address shifting logic executes automatically through the internal wiring structure, guaranteeing deterministic address propagation as each MTU attaches to the DIN rail chain. Dual 6-position keying switches prevent operator insertion errors by offering 36 mechanical slot combinations to enforce hardware alignment for AI810, AI815, or AI845 analog modules.

Frequently Asked Questions

Q: How does the TU835V1 protect transmitter loop power on individual channels?

A: The base unit provides a fused transducer power terminal for each of its 8 channels. Short circuits or field wiring faults on one transmitter loop remain isolated to that specific terminal line, protecting adjacent field instrumentation and backplane electronics.

Q: Can the TU835V1 be used in redundant S800 analog input configurations?

A: No. The TU835V1 features a single-I/O base layout designed strictly for non-redundant analog input applications. Redundant analog input architectures require dual-channel base units like the TU842 or TU843.

Q: How does the DIN-rail latching mechanism handle system grounding?

A: The spring-loaded mechanical latch locks the unit onto standard 35 mm DIN rails while simultaneously engaging integral conductive grounding contacts to link the MTU backplane ground directly to the rail surface.

Field Installation Guidelines

1. DIN Rail Mounting: Mount the TU835V1 onto a standard 35 mm DIN rail (EN 50022). Press firmly until the mechanical latch engages to establish mechanical stability and solid grounding connection.
2. Keying Wheel Configuration: Set the two 6-position mechanical keying dials to the unique code corresponding to the intended analog input module (AI810, AI815, or AI845) before slotting in the active module.
3. Transducer Power Wiring: Connect 24 VDC process power across the two individually isolated power groups. Ensure field transmitter feed lines terminate at the designated fused transducer terminals.
4. Signal Conductor Termination: Strip wire insulation to 7 mm. Insert field wiring (solid 0.2 to 4 mm squared, stranded 0.2 to 2.5 mm squared) into terminal blocks and tighten screws to a torque between 0.5 and 0.6 Nm.
5. ModuleBus Interconnection: Slide adjacent MTU base units closely together along the rail to ensure complete engagement of the ModuleBus connectors and unbroken backplane continuity.