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CNC CPU Board – MITSUBISHI RF203
The RF203 is a CNC CPU control board (“CNC CPU Board”) manufactured by Mitsubishi Electric, a component of the MELDAS numerical control line for machining centres and CNC machine tools. The board handles main part-program processing, axis management and communication with peripheral modules of the CNC system. Multiple hardware revisions are documented; the board integrates into the control rack via a dedicated internal bus.
The CPU board is the computational heart of the numerical control: it interprets the ISO/G-code part program, calculates axis trajectories in real time and coordinates all CNC subsystems (servo drives, I/O modules, operator interface). A CPU failure causes an immediate machine stop and makes any machining impossible; diagnosis is critical because faults often manifest as system errors that are not immediately traceable to the board itself.
Mitsubishi Electric is one of the world’s leading manufacturers of CNC numerical controls, with the MELDAS line serving machine shops worldwide for over forty years. Products of this generation are legacy / discontinued: official support has ended and spare parts are available exclusively through used, surplus or specialist repair channels.
Main Technical Specifications
| Type | CNC CPU control board (CNC CPU Board) |
| Part number | RF203 |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi MELDAS series CNC controllers (verify compatibility against machine documentation) |
| Function | Part-program processing, axis management, CNC subsystem coordination |
| Processor | Dedicated CPU for real-time processing (specifications to be verified against original documentation) |
| Supply voltage | +5 V DC / ±12 V DC via rack bus (typical) |
| Interfaces | CNC rack internal bus; serial and parallel connectors to I/O modules and servo drives |
| Memory | RAM and ROM/EPROM for firmware and part programs (capacity to be verified against documentation) |
| Axis compatibility | Multi-axis (exact number to be verified against original documentation) |
| Weight | ~0.3–0.8 kg |
| Dimensions | ~200–350 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |