Fanuc Motherboard for 0i-C A20B-8200-0391

🔌 FANUC A20B-8200-0391 – ZERO i-C MAIN PCB

What it is:
The A20B-8200-0391 is a main printed circuit board (PCB) used in certain FANUC Series 0i-C (Zero i-C) CNC controller systems. It serves as the central control board (main logic/CPU board) for machine control and communication with other internal modules.

📌 Key Description

• Part Number: A20B-8200-0391

• Name: ZERO i-C MAIN PCB

• Function: Main control/logic board in the FANUC ZERO i-C controller — it handles core processing, coordination of I/O, servo and spindle control, data flow, and communication with other system boards.

• Series: Part of the A20B-8200 FANUC circuit board family.

• CPU Type: Typically built around a 486-class processor version of the Zero i-C main board (as noted in FANUC documentation for similar boards).

🛠️ Use & Application

This board is installed in the controller cabinet of CNC machines using the FANUC ZERO i-C control platform. It is critical for:

• Processing CNC program instructions

• Communicating with servo drives, operator panel, and interfaces

• Managing machine motion and I/O subsystems

• Providing system logic for machine operation and diagnostics

📌 Notes

• It’s a core system board — without it, the CNC controller cannot operate.

• Often sold new, refurbished, or surplus by industrial automation parts suppliers.

• While closely related versions exist (e.g., A20B-8200-0380/0381/0390/0395 for different CPU or DRAM variants), this specific board is one of the main PCB options for the Zero i-C family.