Mitsubishi Electric BB26A / BN634E180H01 Circuit Board Assembly, Backplane

Multi-connector I/O interface board typically found in Mitsubishi CNC or PLC control units (like BJ or Alpha controllers), used for multiplexed signal routing between CPU backplane and peripheral modules.

Model Numbers: BB26A (board assembly), BN634E180H01 (Mitsubishi part code)
Board Type: Connector harness / I/O interface PCB
Connectors:
• (10) DB25 or similar high-density D‑sub female/male connectors (panel-edge mounted)
• (2) Modular header connectors (for ribbon cable to main backplane)
Mounting: PCB mounted via standoffs/screws inside enclosure
Signal Routing: Multi-channel digital or analog I/O lines; likely dual‑redundant or isolated paths per channel
Via Count: At least 12 connectors visible, suggesting 100+ signal lines
PCB Layers: Multi-layer (approx. 4+ layers) for signal integrity
Orientation: Vertical edge-mount connectors; board likely ~300 mm × 200 mm
Power: No active components—powered indirectly via connected modules (no onboard regulator)
Components: Primarily passive — traces, vias, edge-mounted connectors, few resistors or termination components
Labeling: Each connector keyed and silk‑screened with pin numbering
Weight: ~0.3–0.4 kg
Country of Origin: Japan (Mitsubishi OEM)
Main Application: Interface board for routing I/O to CNC/PLC modules; suitable as replacement in Mitsubishi control cabinets requiring BB26A assembly Please review pictures carefully and let us know if you have any questions!