Compatibility

• CNC Series: 18i‑B (18i‑MB, 18i‑TB) (mill/turn models)

• Backplane: Fits FANUC yellow backplane (rear of LCD/MDI unit)

• Expansion Slots: Supports CPU, servo, video, and communication cards (e.g., PROFIBUS/DeviceNet)

Key Specifications

• CPU: High‑speed 32‑bit CNC processor

• Memory: Onboard SRAM/DRAM; ROM for system firmware

• Slots: Multiple riser slots for CPU, servo, I/O, and communication PCBs

• Connectors: I/O, servo, spindle, and communication ports

• Power: 24V DC via backplane

• Operating Temperature: 0 °C to +55 °C

• Humidity: 5%–95% RH (non‑condensing)

Main Functions

• CNC Core Control: Executes all CNC motion, logic, and program processing

• System Hub: Interconnects CPU, servo, spindle, I/O, and communication boards

• Expansion Platform: Accommodates optional communication cards (PROFIBUS‑DP, DeviceNet) and I/O modules

• Data Management: Stores/executes CNC programs, parameters, and tool offsets

Installation & Handling

• ESD Protection: Anti‑static wrist strap mandatory

• Power Off: Disconnect all power before installation/removal

• Slot Alignment: Align PCB notch with backplane key; insert firmly

• Programming Note: Requires parameter/program reload after replacement

Troubleshooting

• No Power: Check backplane power, seating, and fuses

• Boot Failure: Verify firmware, memory, and riser card installation

• Communication Errors: Check expansion card seating and cabling

Related Models

• A20B-8100-0661: 18i‑B main CPU PCB (this part)

• A20B-8100-0430: PROFIBUS‑DP master card (fits this board)

• A20B-8100-0491: DeviceNet master card (fits this board)