ABB TBU810 (TU810) – S800 I/O Terminal Unit for fast, reliable field wiring

The ABB TBU810 you asked about corresponds to the S800 I/O terminal unit commonly listed as TU810 in ABB documentation. From my experience, this base is the go-to wiring interface for many S800 I/O modules, giving you clean, serviceable connections on a 35 mm DIN rail. One thing I appreciate is how it lets you swap or service the I/O module without disturbing the field wiring—usually a big time-saver during turnarounds.

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Key Features

• Optimized for ABB S800 I/O – Designed to host S800 I/O modules and provide orderly field terminations, typically for analog or digital signals depending on the seated module.
• DIN-rail installation – Snaps onto standard 35 mm DIN rail, making it quick to mount inside control cabinets.
• Service-friendly design – Module replacement without re-terminating field wires; you keep your field connections undisturbed.
• Clear channel marking – Channel labeling that keeps commissioning and troubleshooting straightforward in most cases.
• Shielding and grounding provisions – Typically supports shield handling to reduce noise on sensitive analog lines.
• Compact S800 footprint – Saves panel space while keeping wiring density practical for brownfield upgrades.

“We standardized on TU810 bases across two process lines. Technicians like that they can isolate, swap the I/O, and be done in minutes. It seems to cut panel time noticeably.”

Technical Specifications

Related or Supporting Products

• ABB TU812 / TU814 / TU816 – Alternative terminal units in the S800 range; choose based on channel count, terminal style, and isolation details.
• ABB AI810 / AO810 – Analog input/output modules often paired with TU-series bases; verify exact TU compatibility per module.
• ABB DI810 / DO810 – Digital input/output modules for 24 VDC signals; select TU variant that matches terminal and channel needs.
• ABB TB820 / TB821 – ModuleBus communication interfaces for linking S800 I/O to the controller; useful when expanding nodes.
• Shield clamps and grounding kits – Helpful for stable analog measurements and noise control in many cases.

Installation & Maintenance

• Cabinet & environment – Install on 35 mm DIN rail in a clean, dry cabinet. Aim for IP54 or better in harsh areas. Maintain airflow around I/O bases.
• Wiring – Use correctly sized conductors (commonly 0.5–2.5 mm²). Keep analog/shielded cables away from high-voltage runs. Torque terminals per ABB guidelines.
• Grounding – Bond shields at a single point (typically the cabinet ground) and use the base’s shielding provisions where available.
• Hot work practices – De-energize circuits when feasible. If replacing the I/O module, secure field circuits first to avoid transient trips.
• Routine checks – Inspect terminals for looseness, clean dust with dry air, and verify labeling. Firmware updates apply to the controller/I/O module, not the passive base.
• Documentation – Match the TU model with the exact I/O module type; ABB module datasheets list the recommended terminal unit.

Quality & Certifications

• CE compliant; RoHS conformity typical for S800 I/O components
• UL/CSA recognition available on many variants (verify your exact orderable code)
• Manufacturer quality system: ABB operates under ISO-certified processes
• Manufacturer’s warranty: varies by region and SKU; typically 12 months. Our supplied units ship with a 365-day warranty as stated above.