Fanuc C language board for 16i/ 18i/ 21i A20B-8100-0261

A20B-8100-0261 is a printed circuit board (PCB) used in CNC control systems manufactured by FANUC.

📌 Basic Information

• Part Number: A20B-8100-0261

• Type: Printed Circuit Board (PCB)

• Category: Control / Interface Board

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

⚙️ Main Functions

The A20B-8100-0261 board is used for signal processing and communication between modules inside the CNC control system.

Typical functions include:

• Communication between CNC boards

• Control signal processing

• Interface management with other CNC modules

• Supporting the overall operation of the CNC controller

🧩 Installation Location

This board is typically installed:

• Inside the CNC control cabinet

• On the main control rack / motherboard

• Connected to other boards through the FANUC system backplane

🔎 Related Board Family

The A20B-8100 PCB series includes many internal CNC boards such as:

• A20B-8100-0150

• A20B-8100-0261

• A20B-8100-0660 ~ 0665

Differences between these boards usually involve:

• Hardware revision

• System compatibility

• Machine builder configuration

✅ Simple explanation:
A20B-8100-0261 = FANUC internal CNC control PCB used for communication and signal processing inside the CNC controller. 🔧

If you want, I can also explain how to decode FANUC part numbers (A02B / A16B / A20B) so you can quickly identify the type of board just from the number.