The ABB 3BSE069966R1 is an Ethernet-compatible TU854 Extended Module Termination Unit (MTU) designed for the S800 I/O system, providing a robust physical interface and electrical connectivity for communication modules and power distribution in high-reliability industrial automation environments.
Product Introduction
The TU854 is a specialized termination unit within the S800 I/O family, specifically engineered to host and interface with communication interface modules like the CI830 or CI840. As an “Extended” MTU, the 3BSE069966R1 provides additional terminal space and connectivity options compared to standard units, allowing for more complex wiring configurations and redundant power supply connections. It acts as the backbone for the I/O station, ensuring that control signals and power are distributed efficiently to the attached I/O modules while maintaining a compact, DIN-rail mounted footprint suitable for dense control cabinets.
Product Technical Description
Technically, the TU854 serves as a passive baseplate that facilitates the connection between the internal ModuleBus and external field wiring. It includes dual power supply terminals to support redundant 24V DC inputs, which is essential for mission-critical applications where power loss could lead to system downtime. The unit features 50-pin and 25-pin connectors for module interfacing and is designed to handle high-speed data transmission required by modern industrial protocols. Its construction focuses on electrical isolation and electromagnetic compatibility (EMC), ensuring that sensitive electronic modules are protected from field-side interference.
Product Parameters and Datasheet
The technical datasheet for the TU854 3BSE069966R1 highlights a rated insulation voltage of 50V and a maximum current capacity per terminal of 2A. The unit is designed for a nominal voltage of 24V DC (range 19.2V to 30V). It features a 2×8 terminal strip for power and signal distribution and supports a maximum wire size of 2.5 mm² (AWG 14). The dimensions are standardized for the S800 series, with a width of approximately 58.5mm, and it carries an IP20 protection rating. It is designed for mounting on a standard 35mm DIN rail and includes mechanical locking mechanisms to secure the communication modules in place.
Country of Origin
The ABB 3BSE069966R1 / TU854 is typically manufactured in Estonia or Sweden, adhering to the high manufacturing and quality control standards of ABB’s European production facilities.
Application Fields
This termination unit is widely used in distributed control systems (DCS) for the oil and gas industry, chemical processing plants, and power generation facilities. It is specifically applied in S800 I/O stations that require Ethernet-based communication or Profibus connectivity, serving as the primary interface for process automation and remote I/O monitoring.
Product Usage Instructions
During installation, the TU854 must be snapped securely onto a grounded DIN rail to ensure proper EMC performance. Power wiring should be connected to the designated L+ and L- terminals, and if redundancy is required, both sets of power inputs should be utilized from independent sources. Communication modules should be inserted vertically into the MTU until the locking clips engage. It is important to ensure that the ModuleBus address is correctly set on the associated modules before powering the system. For maintenance, the passive nature of the MTU allows for the “hot-swapping” of electronic modules without disturbing the field wiring connected to the TU854 base.
Q&A – Frequently Asked Questions
Q: Can the TU854 support redundant communication modules? A: Yes, the TU854 is specifically designed to accommodate the CI840/CI840A redundant communication interfaces, providing the necessary terminal paths for both modules.
Q: Is field wiring connected directly to the TU854? A: Yes, the TU854 provides the physical terminal blocks where power and ModuleBus expansion cables are connected, though individual I/O field signals typically land on their respective I/O MTUs.
Q: What is the difference between TU854 and TU810? A: The TU854 is an extended MTU designed specifically for communication interfaces with redundant power support, whereas the TU810 is a more basic MTU used for standard I/O modules.
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