ABB TU890 3BSC690075R1

Description

Product Description

The ABB TU890 3BSC690075R1 is a high-performance I/O termination unit belonging to ABB’s System 800xA and AC 800M family. This module, often called a Terminal Unit (TU), serves as a remote and distributed I/O station that extends the controller’s reach to field devices over a high-speed, deterministic industrial network. The primary function of the ABB TU890 is to act as an intelligent node that houses various types of electronic I/O modules (for analog, digital, and temperature signals) and provides the network interface to connect them back to a central AC 800M controller. It concentrates field signals locally, digitizes them, and transmits the data via a robust fieldbus protocol like PROFIBUS DP or PROFINET IO, dramatically reducing the amount of individual wiring needed to run back to a central cabinet. The TU890 3BSC690075R1 is engineered for reliability in harsh plant environments, enabling scalable, cost-effective, and flexible system architectures for large-scale industrial automation.

Technical Parameters and Characteristics

• Manufacturer and Platform: ABB, System 800xA / AC 800M.

• Device Type: Remote I/O Station / Terminal Unit.

• Key Function: Houses I/O modules and provides network connectivity as a remote slave device.

• Form Factor: A modular enclosure or base unit designed to mount on a DIN-rail or panel. It contains slots for inserting specific electronic I/O modules (e.g., DI, DO, AI, AO, RTD modules) and a mandatory communication interface module (CIM).

• Communication Interface: Requires a Communication Interface Module (CIM) to be installed, such as a PROFIBUS DP or PROFINET IO module. This CIM defines the network protocol and handles all data exchange with the master controller (AC 800M).

• I/O Module Support: Compatible with a range of ABB S800 I/O modules, which are known for their high density, channel-by-channel isolation, and diagnostic capabilities.

• Power Supply: Has separate connections for system power (for the electronics and communication) and field power (for powering the I/O channels and connected sensors/actuators). Often designed for 24 VDC operation.

• Diagnostics: Provides comprehensive diagnostics at the unit, module, and channel level. Status is communicated back to the master controller and can be monitored in the engineering software.

• Environmental Rating: Typically rated for industrial environments (e.g., IP20 for the interior, with options for higher protection with appropriate enclosures).

• Configuration: The I/O configuration and mapping are defined in the central engineering tool, ABB Control Builder M. The TU890 itself is configured as a node on the fieldbus network (e.g., assigned a PROFIBUS station address).

Advantages and Key Features

• Distributed Architecture & Reduced Wiring Costs: The core advantage of the ABB TU890 is enabling a distributed I/O topology. By placing I/O close to field devices, it drastically reduces long runs of individual signal cables, saving on material, installation time, and cabinet space.

• High Flexibility and Scalability: The modular design allows for easy reconfiguration and expansion. I/O modules can be mixed and matched within the TU890 station, and additional TU890 units can be added to the network as needed.

• High Reliability and Diagnostic Depth: Utilizing the proven ABB S800 I/O technology, it offers excellent noise immunity, isolation, and detailed diagnostic information for predictive maintenance and fast troubleshooting.

• Seamless System Integration: As a native component of System 800xA, it is fully integrated into the engineering, operation, and asset management environment. Modules appear as objects in Control Builder M.

• Robust Design for Industrial Use: Built to withstand temperature variations, vibration, and electromagnetic interference common in industrial settings like switchrooms and field enclosures.

Application Cases in Various Fields

• Oil & Gas Production Platforms: Distributing I/O points across different decks or modules for valve control, tank level, and pressure monitoring, connected back to a central control room.

• Water and Wastewater Treatment Plants: Placing TU890 stations near remote pump houses, filter beds, or chemical dosing stations to gather flow, level, and analytical data.

• Chemical Processing Plants: Extending I/O to distributed skids, reactor areas, and storage tank farms to minimize cabling in large, classified areas.

• Power Plant Balance of Plant (BOP): Monitoring and controlling auxiliary systems (water treatment, fuel handling, ash handling) spread over a wide geographical area within the plant.

• Automated Material Handling: Controlling sections of a large conveyor system or warehouse automation from local TU890 stations for faster response and simpler wiring.

Comparisons with Competing Products (e.g., Siemens ET 200SP, Rockwell Allen-Bradley Point I/O, Emerson DeltaV CHARMs)

• In favor of the ABB TU890 3BSC690075R1: It is the strategic remote I/O solution for the ABB System 800xA ecosystem. Its use of the high-performance S800 I/O modules provides excellent channel isolation and diagnostics. Integration with Control Builder M is seamless.

• Points to consider: Competitors have similar distributed I/O stations. Siemens ET 200SP is known for its compact size and ease of use. Rockwell Point I/O is deeply integrated with Logix controllers. The choice is typically governed by the overarching control system platform. For an AC 800M-based system, the TU890 is the logical and most fully supported choice.

Selection Suggestions and Precautions

1. System Architecture Planning: Carefully plan the network topology. Determine the number of TU890 stations needed, their locations, the required I/O count per station, and ensure the chosen fieldbus (PROFIBUS/PROFINET) can handle the data load and distance.

2. Select the Correct CIM: The TU890 base unit requires a Communication Interface Module (CIM). You must explicitly order the correct CIM (e.g., PROFIBUS DP-V1, PROFINET IO) for your network. The base unit 3BSC690075R1 alone is not functional without it.

3. Power Supply Sizing: Calculate the total power consumption of all installed I/O modules (both system and field load) to select appropriately rated power supplies. Undersizing can cause intermittent faults or module resets.

4. Proper Network Installation: For PROFIBUS DP, adhere strictly to guidelines: use proper shielded cable, install terminators at both ends of the segment, and avoid star topologies. Assign unique station addresses.

5. Environmental Protection: While the TU890 electronics are typically IP20, the enclosure it’s mounted in must provide adequate environmental protection (IP rating, temperature control) for its installed location.

6. Procurement and Configuration: Purchase the ABB TU890 3BSC690075R1, the required CIM, and S800 I/O modules from authorized ABB distributors. Ensure the configuration in Control Builder M matches the physical hardware layout and module types exactly. Using non-genuine or incorrectly specified modules can lead to communication failures and lack of support.

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