Fanuc A20B-2900-014 CPU Circuit Board

Main processing board for Fanuc Series 16/18 CNC systems, responsible for executing G-code, managing I/O, and coordinating motion control tasks.

Technical Specifications:
Part Number: A20B‑2900‑014 (sometimes labeled A20B‑2900‑0140)
Board Type: Central Processing Unit (CPU) board
System Compatibility: Fanuc Series 16 and Series 18 CNC controls
Processor: Built-in microprocessor with onboard firmware; real-time control architecture
Memory: Includes RAM for program execution and EEPROM/ROM for permanent storage of system firmware and user settings
I/O Interfaces: Connectors for data buses, communication with I/O boards, and panel operator interface signals
Diagnostic Features: Status LEDs for power, CPU activity, fault conditions, and communication
Protection: Onboard RESET circuit and watchdog timer to ensure reliable operation
Cooling Method: Passive cooling; requires rack/environment airflow
Mounting Format: Plug-in board compatible with standard Fanuc control chassis
Country of Manufacture: Japan (Fanuc Ltd.)
Typical Application: Core control board used in CNC machining centers, mills, lathes, and other automated equipment Please review pictures carefully and let us know if you have any questions!