Description
ABB TB826 – Terminal Base for S800 I/O, clean field wiring and stable ModuleBus connection
The ABB TB826 is a terminal base used with the ABB S800 I/O family. From my experience, it’s chosen when you want dependable field terminations on a compact 35 mm DIN rail, while keeping the ModuleBus backplane intact for the pluggable I/O modules. You might notice that it reduces panel wiring clutter and makes module swaps far quicker—typically a few minutes, without disturbing the field conductors.
Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express options: FedEx, UPS, DHL
Key Features
- Dedicated S800 I/O base – Provides the field terminal interface and backplane contacts for ABB S800 I/O modules.
- DIN-rail snap-on installation – 35 mm DIN rail mounting keeps cabinet builds fast and tidy.
- Stable ModuleBus continuity – Maintains the internal bus connection so modules can be inserted or replaced cleanly.
- Neat field terminations – Typically supports 0.5–2.5 mm² conductors; simplifies routing for analog and digital signals.
- Service-friendly layout – One thing I appreciate is the clear separation between backplane and field wiring; it helps during maintenance and troubleshooting.
- Compact footprint – Saves cabinet width, which in many cases lets you fit higher I/O density per panel.
Technical Specifications
| Brand / Model | ABB TB826 |
| HS Code | 853890 (Parts for electrical control equipment) |
| Power Requirements | Passive terminal base; no separate power input (power is provided via the S800 ModuleBus through the mated I/O module) |
| Operating Temperature | Typically 0 to +55 °C, non-condensing environment |
| Signal I/O Types | Supports field terminations for analog and digital channels as defined by the pluggable S800 I/O module (e.g., AI, AO, DI, DO) |
| Communication Interfaces | ModuleBus backplane contacts (no external communication ports on the base) |
| Installation Method | 35 mm DIN rail mounting inside a control cabinet; front-access wiring |
| Typical Wiring Capacity | 0.5–2.5 mm² (AWG 20–14) stranded with ferrules, depending on terminal type |
| Mechanical Footprint | Compact S800 I/O base width (≈45 mm module width typical for this family) |
Related / Supporting Products
- ABB S800 I/O Modules – AI810A (Analog Input), AO810V2 (Analog Output), DI810 (Digital Input), DO810 (Digital Output). These plug into the terminal base to define the channel function and quantity.
- Communication Interfaces – CI854A (PROFIBUS DP), CI869 (PROFINET). They connect S800 I/O to higher-level controllers or networks.
- Controllers – AC 800M series (e.g., PM864). In most cases, used as the main controller hosting the I/O and fieldbus interfaces.
- Alternative base styles – If you need different terminal styles or channel grouping, ABB offers other S800 terminal units/bases in the same family; selection typically depends on wiring preference and module type.
A maintenance lead at a food & beverage plant told us that switching to ABB’s S800 base style shaved a noticeable amount of time from changeovers—mainly because field terminations stayed put while the technician swapped the module.
Installation & Maintenance
- Cabinet environment – Install on a 35 mm DIN rail inside an industrial enclosure (IP54 or better recommended). Allow ventilation space above and below the row.
- Wiring practices – Use ferruled conductors; separate low-level analog from inductive loads; route shielded cables to a defined grounding point. Tighten terminal screws to the recommended torque.
- Grounding & shielding – Keep a clean earth reference; bond cable shields at the cabinet side as per site EMC policy. You might notice that stable grounding reduces intermittent noise on analog channels.
- Module handling – De-energize the segment before inserting/removing I/O modules. Protect backplane contacts from dust and ESD.
- Routine checks – Periodically re-check terminal torque, clean dust with dry air, and visually inspect for discoloration or loose strands. Firmware updates apply to the I/O module, not the passive base.
Quality & Certifications
- Certifications – CE compliant; typically UL/cUL listed and RoHS conformant for S800 I/O family components.
- Manufacturer Warranty – Backed by a 365-day warranty from shipment.
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