ABBIRMU811IModule Termination Unit

Product Description

The RMU811 is a specialized Module Termination Unit (MTU) designed to provide a high-reliability mounting foundation for ABB Symphony Plus and Advant series hardware. This unit is specifically engineered to house redundant pairs of RFO810 fiber optic repeater modules, ensuring continuous communication across the HN800 bus even in the event of a single module failure.

By integrating both power distribution and HN800 bus connectors directly into the base, the RMU811 eliminates complex manual wiring and reduces potential points of failure. Its rugged mechanical design ensures secure seated connections for the plug-in modules, making it a critical component for distributed I/O architectures in power generation and large-scale utility automation where network uptime is mandatory.

Technical Specifications

• Manufacturer: ABB

• Model Number: RMU811

• Functional Compatibility: Designed exclusively for redundant RFO810 fiber optic modules

• Integrated Interfaces: * Dual-slot module mounting base

• Integrated HN800 bus connectors

• Built-in DC power distribution terminals

• Installation Style: Panel or rack-mount compatible base unit

• Customs Tariff Number: 85177000

• Physical Dimensions:

• Height: 80 mm

• Width: 200 mm

• Depth/Length: 250 mm

• Net Weight: 360 g

• Manufacturing Origin: USA / Europe

Application Scenarios

The RMU811 is typically deployed in the "Star Architecture" of a Symphony Plus system, including:

• Remote I/O Hubs: Providing the base for redundant fiber links connecting remote turbine halls to the central controller.

• Network Infrastructure: Serving as the termination point for long-distance (up to 3 km) optical segments in harsh EMI environments.

• Control Cabinet Optimization: Simplifying the wiring of redundant communication paths within Advant OCS or S+ Control cabinets.