A20B-8100-0261 is a printed circuit board (PCB) used in CNC control systems manufactured by FANUC.
📌 Basic Information
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Part Number: A20B-8100-0261
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Type: Printed Circuit Board (PCB)
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Category: Control / Interface Board
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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:
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Communication between CNC boards
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Control signal processing
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Interface management with other CNC modules
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Supporting the overall operation of the CNC controller
🧩 Installation Location
This board is typically installed:
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Inside the CNC control cabinet
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On the main control rack / motherboard
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Connected to other boards through the FANUC system backplane
🔎 Related Board Family
The A20B-8100 PCB series includes many internal CNC boards such as:
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A20B-8100-0150
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A20B-8100-0261
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A20B-8100-0660 ~ 0665
Differences between these boards usually involve:
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Hardware revision
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System compatibility
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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.


