Product Overview
When project delays and late changes threaten automation budgets, the ABB TU865 3BSE078712R1 MTU for Ethernet FCI (Select I/O) provides a reliable solution. As part of the ABB Select I/O system, this termination unit decouples tasks, minimizes rework, and standardizes I/O cabinetry. It connects up to 12 Select I/O MTUs and hosts single or redundant Ethernet Adapters (TC810, TC811) and Ethernet FCI Communications Interface Modules (CI845s) for robust communication with AC 800M controllers. The TU865 also supports an optional High Integrity Module (HI880) for SIL 3 safety applications. One TL814K01 cover plate is included.
Technical Specifications Breakdown
The TU865 operates over a wide temperature range: -40 °C to +70 °C (-40 °F to 158 °F) for operating, and -40 °C to +85 °C (-40 °F to 185 °F) for storage. It withstands pollution degree 2 per IEC 60664-1 and relative humidity from 5 to 95% (non-condensing). Altitude capability spans -1000 to 5000 m (restrictions apply). The unit meets mechanical operating conditions per IEC 61131-2 and EMC standards IEC/EN 61000-6-4 and IEC/EN 61000-6-2. Overvoltage category II per IEC 60664-1 applies. Protection class is IP20 per IEC 60529. Dimensions are 135 mm wide, 95.5 mm deep, and 210 mm high, with a weight of 500 g (including base).
Industry Applications
In process industries like oil and gas, chemical, and power generation, the TU865 enables flexible, scalable I/O architectures. For example, a refinery upgrading its distributed control system can use the TU865 to connect multiple I/O racks via Ethernet, reducing field wiring and simplifying maintenance. The wide operating temperature range suits outdoor or harsh indoor environments. The hazardous area certifications (ATEX, IECEx, cULus, CCC Ex) allow installation in Zone 2 and Division 2 locations, making it ideal for explosive atmospheres.
Installation & Setup Guidance
Mount the TU865 on a vertical DIN rail. Ensure the environment meets pollution degree 2 and overvoltage category II conditions. Use the included TL814K01 cover plate after installing modules. For redundant communication, install two Ethernet Adapters (TC810 or TC811) and two CI845 modules. For SIL 3 applications, add the HI880 High Integrity Module. Follow standard wiring practices for Ethernet connections and ground the unit per local codes.
Maintenance & Reliability
Routine inspection of the TU865 should focus on environmental conditions: keep within the -40 °C to +70 °C range, maintain humidity below 95% non-condensing, and avoid corrosive atmospheres (G3 classification). Check for dust accumulation on IP20 enclosures and clean with a dry cloth if needed. Verify that all module connections remain secure. The robust design supports long service life in demanding industrial settings.
Compatibility & Integration
The TU865 communicates via Ethernet protocol and integrates with ABB Ability System 800xA. It works with AC 800M controllers through CI845 modules. Compatible with TC810 and TC811 Ethernet Adapters, and the HI880 High Integrity Module. Supports up to 12 Select I/O MTUs. The unit is CE and UKCA marked, and carries marine certifications from DNV and ABS.
Selection Guide & Purchasing Advice
Before ordering the ABB TU865 3BSE078712R1, verify your system requirements: number of I/O points, need for redundancy, and safety integrity level (SIL 3 requires HI880). Confirm hazardous area classification matches your site (ATEX, IECEx, cULus, CCC Ex). SpareTechPLC offers this unit with fast shipping and expert support. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
Q1: How many MTUs can the TU865 support?
The TU865 connects up to 12 Select I/O MTUs.
Q2: Can the TU865 be used in SIL 3 applications?
Yes, it hosts an optional High Integrity Module (HI880) for SIL 3 safety applications.
Q3: What is the operating temperature range of the TU865?
The operating temperature range is -40 °C to +70 °C (-40 °F to 158 °F).
Q4: Is the TU865 suitable for hazardous areas?
Yes, it has certifications including ATEX II 3G, IECEx, cULus for Class I Division 2, and CCC Ex.
Q5: What cover plate is included with the TU865?
One TL814K01 cover plate is included with every TU865.
