The ABB RMU811 is a mounting base designed for a specific application within the ABB Symphony Plus system, particularly for their SD I/O (Serial Device Input/Output) products.

• Function: The RMU811 serves as a mounting point for a redundant pair of RFO810 modules. RFO810 modules are repeaters used to extend the reach of the HN800 bus.
• Connectors: The RMU811 features two key connector types:
  • Power: This provides electrical supply to the mounted RFO810 modules.
  • HN800 connectors: These are specialized connectors for the ABB HN800 bus. HN800 is a proprietary communication bus used within the Symphony Plus system for data transmission between I/O modules and the control system.

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