A20B-8100-0661 is a printed circuit board (PCB) used inside CNC control systems manufactured by FANUC.
📌 Basic Information
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Part Number: A20B-8100-0661
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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 control units (commonly Series 0i / 16i / 18i / 21i depending on machine configuration)
⚙️ Main Functions
The A20B-8100-0661 board is an internal CNC control board used to support communication and signal processing within the CNC system.
Typical functions include:
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Data communication between CNC modules
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Signal processing for machine control
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Interface management with other system boards
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Supporting CNC system logic and operation
🧩 Installation Location
This board is usually installed:
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Inside the CNC control cabinet
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On the main control rack or motherboard
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Connected through the FANUC backplane system
🔧 Typical Applications
The board may be used in machines such as:
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CNC machining centers
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CNC lathes
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CNC grinding machines
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Other industrial machines using FANUC CNC controllers
🔎 Relation to A20B-8100-0660
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A20B-8100-0661 is typically a revision or variant of A20B-8100-0660.
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Differences may include hardware revision, firmware compatibility, or component updates.
✅ Simple explanation:
A20B-8100-0661 = FANUC internal CNC control PCB used for communication and signal processing inside the CNC controller. 🔧
If you want, I can also show you:
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The full function of the A20B-8100 board series
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Common boards used in FANUC 0i / 16i control racks
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A diagram of the FANUC CNC control board structure.


