The Mitsubishi TZ865B (SCPU-ASSY) is a dedicated central processing unit (CPU) board manufactured by Mitsubishi Electric Corporation for MELFA industrial robot controllers. Engineered to serve as the core computing engine, the board executes real-time motion control algorithms, axis interpolation, sequence logic, and communication interfacing across compatible CR1D, CR1DA, and CR1QA series controllers. It supports various precision articulated and SCARA robot arms, including the RV-2SD, RV-2SQ, RV-3SD, and RH-6SDH series.

Constructed in Japan to stringent industrial reliability standards, the TZ865B assembly features proprietary Mitsubishi MAC525 processing ICs, high-precision crystal oscillators, integrated FC1 communication/expansion connectors, and heavy-duty bus edge connectors. An onboard 4-digit 7-segment LED display provides immediate system status, operational diagnostics, and error reporting, allowing for efficient troubleshooting and minimal downtime in automated production lines.