DCS I/O Termination Solution – ABB TU890 3BSC690075R1 | AC800M Series
The ABB TU890 (part number 3BSC690075R1) is a dedicated Module Termination Unit engineered for the ABB AC800M Distributed Control System platform. It provides a reliable, structured field-wiring interface that allows engineers to connect process signals cleanly and safely — without disturbing the controller module itself. Whether you are commissioning a new plant or maintaining an existing DCS installation, the TU890 is the termination backbone your I/O architecture depends on.
Where This Product Is Used
- Oil & Gas Processing Plants — Field signal termination for flow, pressure, and temperature loops in upstream and downstream facilities.
- Chemical & Petrochemical Plants — Safe, structured wiring interface in hazardous-area DCS cabinets requiring IEC-compliant termination.
- Power Generation & Utilities — Turbine control and BOP (Balance of Plant) I/O marshalling panels using AC800M controllers.
- Pulp & Paper Mills — Process automation cabinets where high channel-count termination and easy maintenance access are critical.
- Water & Wastewater Treatment — SCADA/DCS hybrid architectures requiring modular, rail-mounted termination units.
- Pharmaceutical Manufacturing — GMP-compliant control panels where traceable, documented wiring is mandatory.
- Mining & Minerals Processing — Robust termination in dusty, vibration-prone environments with AC800M-based automation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3BSC690075R1 |
| Model | TU890 |
| Manufacturer | ABB |
| Series | AC800M / Advant Controller 800 |
| Function | Module Termination Unit |
| Mounting | DIN Rail |
| Compatible Modules | AC800M I/O Modules (S800 I/O Series) |
| Weight | Approx. 500 g |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Humidity | 5–95% RH, non-condensing |
| Protection Class | IP20 (panel-mounted) |
| Compliance | CE, IEC 61131-2 |
Why Engineers Specify This Model
- Hot-swap capability — The TU890 allows the I/O module to be replaced without disconnecting field wiring, minimizing process downtime.
- Dedicated keying — Mechanical coding prevents incorrect module insertion, a critical safety feature in multi-module cabinets.
- Compact DIN-rail form factor — Optimizes cabinet space in high-density marshalling panels.
- Direct ABB ecosystem integration — Designed exclusively for AC800M S800 I/O modules; no adapters or workarounds required.
- Long product lifecycle — ABB’s AC800M platform has an extended support horizon, making TU890 a sound long-term investment.
- Simplified commissioning — Pre-wired termination blocks reduce field wiring errors and accelerate loop testing.
Complete System Bill of Materials
The TU890 is one component in a complete AC800M I/O node. A typical BOM includes:
- ABB TU890 3BSC690075R1 — Module Termination Unit (this item)
- ABB S800 I/O Module (e.g., AI810, AO810, DI810, DO810) — Signal processing module
- ABB TB820V2 — ModuleBus Modem for remote I/O communication
- ABB PM866 / PM891 — AC800M Process Controller
- ABB CI854 / CI857 — Communication Interface Module
- 24 VDC Power Supply — Panel power for I/O nodes
- DIN Rail & Cabinet Enclosure — Mounting infrastructure
Compliance & Industry Standards
- IEC 61131-2 — Programmable controllers: equipment requirements and tests
- IEC 61000-4 series — EMC immunity requirements
- CE Marking — European conformity for industrial control equipment
- RoHS compliant — Restriction of hazardous substances
- ATEX / IECEx — Consult ABB for zone-rated installation configurations
Quality Assurance & Sourcing
Konmask.com sources ABB TU890 3BSC690075R1 units through verified industrial automation supply channels. Every unit undergoes visual inspection and functional verification before shipment. We supply both new-in-box (NIB) and tested-surplus stock, clearly labeled with condition and warranty terms. Traceability documentation is available upon request for regulated industries.
- ✔ Genuine ABB part — no counterfeit risk
- ✔ Condition clearly stated: New / Tested Surplus / Refurbished
- ✔ Warranty: 90-day replacement guarantee
- ✔ Global shipping with export documentation support
- ✔ Bulk order pricing available for system integrators and EPCs
How to Source This Part
- Click Add to Cart or Request a Quote on this page.
- Provide your required quantity, delivery timeline, and destination country.
- Our team will confirm stock availability, lead time, and pricing within 24 hours.
- For urgent requirements, contact us directly: support@konmask.com | +0086 19859288691
- We support T/T bank transfer, PayPal, and trade finance for qualified buyers.
Application-Specific FAQ
Q: Can the TU890 be used with S900 I/O modules?
A: No. The TU890 is designed specifically for the S800 I/O series within the AC800M platform. S900 modules use different termination units.
Q: Is field wiring retained when the I/O module is removed?
A: Yes. The TU890 design keeps field wiring connected to the termination unit; only the I/O module is removed, enabling hot-swap maintenance.
Q: What is the maximum number of TU890 units per I/O node?
A: This depends on the ModuleBus configuration. Refer to ABB document 3BSE035980 (AC800M Hardware Configuration) for node capacity limits.
Q: Do you supply the matching S800 I/O modules?
A: Yes. Konmask.com stocks a wide range of ABB S800 I/O modules. Contact us with your full BOM for a consolidated quote.
Q: Can this unit be used in SIL-rated safety loops?
A: The standard TU890 is not SIL-rated. For safety instrumented systems, consult ABB’s S800 Safety I/O product line.
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Contact: support@konmask.com | +0086 19859288691
