Fanuc Motherboard for 21i A20B-8100-0664

A20B-8100-0664 is a printed circuit board (PCB) used inside CNC control systems produced by FANUC.

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📌 Basic Information

• Part Number: A20B-8100-0664

• Type: Printed Circuit Board (PCB)

• Category: Internal Control / Interface Board

• Used In: FANUC CNC control units (commonly Series 0i / 16i / 18i / 21i, depending on machine configuration)

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⚙️ Main Functions

The A20B-8100-0664 board is used for signal processing and communication between modules in the CNC system.

Typical functions include:

• Data communication between CNC boards

• Signal processing for machine control

• Interface management with other system components

• Supporting the overall operation of the CNC controller

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🧩 Installation Location

This PCB is usually installed:

• Inside the CNC control cabinet

• On the main control rack / motherboard assembly

• Connected through the FANUC backplane system

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🔎 Related Board Series

The A20B-8100-066x series includes several similar boards:

• A20B-8100-0660

• A20B-8100-0661

• A20B-8100-0662

• A20B-8100-0663

• A20B-8100-0664

These are typically hardware revisions or configuration variants of the same board family used in different CNC machine configurations.

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✅ Simple explanation:
A20B-8100-0664 = FANUC internal CNC control PCB used for communication and signal processing inside the CNC controller. 🔧

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If you want, I can also explain which A20B-8100 boards belong to FANUC 0i-D CPU systems and how to identify the correct replacement board, which is very useful for CNC maintenance.