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TU860

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The ABB TU860 is an Ethernet FCI module terminal unit for S800 I/O systems, designed for the installation of single or redundant communication modules and adapters.
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Technical specifications for TU860

  • Manufacturer:
    ABB
  • Part Number:
    TU860
  • Product Family:
    ABB Advant OCS and Advant-800xA
  • Product Type:
    Ethernet FCI Module Termination Unit
  • ModuleBus Connectors:
    2 for I/O cluster connection
  • Mounting:
    35 mm DIN rail
  • Operating Temperature:
    -40°C to +70°C
  • Storage Temperature:
    -40°C to +85°C
  • Relative Humidity:
    5% to 95% non-condensing
  • Protection Class:
    IP20 (IEC 60529)
  • Pollution Degree:
    Degree 2 (IEC 60664-1)
  • Weight:
    0.5 kg
  • Estimated shipping dimensions:
    21x13.5x9.6cm
  • Tariff Code:
    8537109890
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Firmware & Updates Operating Environment

Features:

  • Full hardware redundancy for maximum uptime
  • Dual 24V DC power inputs with fault tolerance
  • Engineered for extreme and hazardous environments
The ABB TU860 features two independent mounting slots for CI845 FCI modules and two for Ethernet adapters, allowing you to configure fully redundant communication paths. If the primary module or adapter fails, the secondary unit takes over seamlessly without process interruption, making it ideal for continuous production lines and critical infrastructure.

Equipped with two separate connectors for 24V power supplies, the ABB TU860 supports redundant power feeding. In normal operation, both supplies share the load; if one supply fails, the other automatically sustains all connected modules. This design eliminates a common single point of failure in control cabinets.

Rated for operation from -40°C to +70°C and certified for ATEX Zone 2 and Class I Division 2 locations, the ABB TU860 can be installed outdoors, in unheated shelters, or directly in oil/gas processing areas. Its G3 corrosive atmosphere rating further ensures long-term reliability in chemical plants and coastal installations.

The TU860 ABB Ethernet FCI Module Termination Unit may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
ABB TU860 Ethernet FCI Module Termination Unit Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
ABB TU860 Ethernet FCI Module Termination Unit

General

  • Manufacturer ABB
  • Model TU860
  • Condition New Original ready stock
  • Product Family TU846,TU847,TU890
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Oil & gas upstream and midstream facilities – The ABB TU860 withstands extreme temperatures and corrosive atmospheres, making it suitable for wellhead control, pipeline valve stations, and gas processing skids where uptime is critical.
  • Chemical and pharmaceutical batch reactors – Dual power and communication redundancy ensure that recipe execution and safety interlocks remain active even during module replacement or a single power supply failure
  • Power generation substations and auxiliary systems – Installed in switchgear rooms or outdoor cabinets, the ABB TU860 connects protection relays and governor controls to the main DCS without derating in high-EMI environments.
  • Water/wastewater treatment plants – The G3 corrosion rating and wide humidity tolerance allow the ABB TU860 to be placed near clarifiers, digester buildings, or lift stations where condensation and trace H₂S are present.
  • No onboard firmware on the ABB TU860 – The ABB TU860 is a passive termination unit; it contains no processor or firmware. All communication logic resides in the CI845 or other FCI modules inserted into its slots.
  • Firmware updates are performed on the CI845 module – To update the Ethernet fieldbus interface, you replace or flash the CI845 module using ABB's Control Builder or 800xA configuration tools. The ABB TU860 remains untouched during this process.
  • Hardware revision compatibility – When ordering replacement ABB TU860 units, always verify the revision number against your existing stock. ABB may introduce minor layout changes that require corresponding ModuleBus terminators (TB807 variants).
  • No field-upgradable components – The ABB TU860 does not support user-installed firmware, security patches, or feature upgrades. Any functional enhancement requires changing the inserted communication module, not the TU860 base.
  • Extended temperature range – Certified for -40°C to +70°C ambient operation, the ABB TU860 can be deployed in arctic pipeline stations or desert solar farms without supplemental heating or air conditioning.
  • Hazardous location readiness – With ATEX Zone 2 and Class I Division 2 certifications, the ABB TU860 may be installed in areas where flammable gases or vapors are present only under abnormal conditions (e.g., near tank vents or sampling points).
  • High-humidity and condensing environments – Rated for 5–95% relative humidity non-condensing, the ABB TU860 performs reliably in unsealed enclosures, pump rooms, and coastal installations where daily temperature swings cause moisture.
  • Corrosive gas resistance (G3) – The PCB and connector coatings meet ISA-S71.04 G3 severity levels, allowing the ABB TU860 to operate for years in paper mills, refinery process units, and fertilizer plants without creeping corrosion.
Description
The ABB TU860 serves as the physical and electrical backbone for Ethernet-based fieldbus communication within ABB's S800 I/O system. It provides two dedicated mounting slots for CI845 FCI modules and two slots for Ethernet adapters, supporting both single and redundant configurations. This design ensures deterministic data flow and uninterrupted process control even during module replacement or network faults.

Engineered for harsh industrial conditions, the ABB TU860 operates reliably across a temperature range of -40°C to +70°C and withstands corrosive atmospheres (G3 rating). Its IP20 protection class and compliance with hazardous location certifications (ATEX Zone 2, Class I Div 2) make it suitable for oil & gas, chemical, and power generation facilities where safety and uptime are non-negotiable.

Installation of the ABB TU860 is straightforward via standard 35mm DIN rail mounting. The unit integrates seamlessly with ABB System 800xA and AC 800M controllers, forming a resilient I/O backbone that reduces engineering effort, simplifies maintenance through hot-swappable module support, and lowers total cost of ownership for distributed control systems.
Alternative Names
TU86O 3BSE078710R1 TU860 3BSE078710R1 TU847 TU890 TU860 TU842 TU846
Technical notes
When deploying the ABB TU860, always verify that the two ModuleBus connectors are properly terminated using the included TB807 terminators to ensure error-free communication with downstream I/O clusters. Additionally, for redundant power configurations, both 24V DC inputs must be active to achieve the advertised fault tolerance; otherwise, the unit will operate in single-supply mode without automatic failover.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
In which system architecture should I use the ABB TU860?
The ABB TU860 is designed specifically for ABB S800 I/O stations connected via Ethernet to System 800xA or AC 800M controllers. It acts as the termination unit for CI845 FCI modules, not as a standalone I/O module.
Can I hot-swap a communication module while the ABB TU860 is powered?
Yes. The ABB TU860 supports module replacement under power, provided you follow ABB's hot-swap procedure. This allows you to replace a faulty CI845 module without shutting down the entire I/O station or interrupting the control process.
Does the ABB TU860 work with third-party Ethernet adapters?
No. The ABB TU860 is qualified only for ABB's own Ethernet adapters (such as CI845) and S800 I/O modules. Using non-ABB components may violate certifications and compromise system reliability.
How do I know if my environment requires the ABB TU860's G3 rating?
If your facility contains corrosive gases such as H₂S, SO₂, or chlorine – common in wastewater treatment, petrochemical refineries, or pulp & paper mills – the ABB TU860's G3 rating ensures the terminal unit and its connectors will not degrade prematurely.

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