Mitsubishi RQ65B-C Extension Base Unit for MELSEC-Q Series

The Mitsubishi RQ65B-C (RQ65B-C) is an extension base unit designed for use within Mitsubishi MELSEC-Q series programmable logic controller systems. Serving as an expansion backplane, this unit provides mounting positions and bus connections for additional system modules, facilitating modular control architecture and input/output expansion in industrial automation setups. The unit integrates into MELSEC-Q control assemblies to maintain reliable communication across expansion racks, ensuring consistent power distribution and high-speed data transfer between the central controller and connected expansion hardware. With a robust build and an approximate weight of 10 kg, the RQ65B-C is engineered for dependable continuous operation in demanding factory automation environments. It is commonly deployed in manufacturing lines, processing machinery, automotive production cells, and packaging equipment requiring scalable modular I/O configurations. As an essential replacement component for routine maintenance, repair, and system upgrades, this extension base unit helps restore operational continuity and supports long-term reliability across industrial control infrastructures.