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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-8001-0641 |
The FANUC A20B-8001-0641 is an HSSB interface PCB used on the CNC side of FANUC i-Series controls. It is associated with 16i, 18i, and 21i platforms, mounts in the basic unit, and includes the COP7 optical connector for the high-speed serial bus link.
In a practical machine environment, this board is selected when the CNC needs a dedicated optical communication path to a compatible personal computer rather than a standard low-speed serial connection.
In the i-Series hardware architecture, HSSB is the high-speed serial bus used to transfer large amounts of data between the CNC and a PC through optical fiber.
That makes A20B-8001-0641 a board for communication and system integration rather than for axis control, spindle power, or display-only functions.
It is commonly installed alongside core control hardware such as the CPU card, axis control card, and memory modules in the yellow-backplane control structure.
One practical detail matters during system planning: the HSSB cable length can reach up to 100 meters when this NC-side interface board is paired with specific compatible PC-side boards.
That makes the board useful not only for cabinet-level integration, but also for installations where a clean optical link is preferred across a longer machine-to-PC distance.
| Parameter | Value |
|---|---|
| Part Number | A20B-8001-0641 |
| Brand | FANUC |
| Product Type | Interface PCB |
| Board Function | HSSB Interface |
| Control Family | 16i / 18i / 21i i-Series |
| Connection Medium | Optical fiber |
| Optical Connector | COP7 |
| Installation Context | CNC-side board in the basic unit |
| Typical Role | High-speed CNC-to-PC communication |
The A20B-8001-0641 is best suited to PC-to-CNC high-speed communication in FANUC i-Series systems.
It fits machines that need an optical HSSB link for transferring larger data volumes, integrating PC-based support software, or maintaining an established CNC-to-PC communication structure without changing the original control architecture.
It is also well matched to retrofit support, board replacement in 16i/18i/21i controls, and service work on yellow-backplane i-Series systems where the original HSSB pathway must be restored.
In maintenance terms, this board is most useful when the CNC hardware remains serviceable and the communication layer needs the correct interface board rather than a broader control change.
Q1: What is the main purpose of A20B-8001-0641?
Its job is to provide the HSSB interface on the CNC side, allowing a FANUC i-Series control to exchange large amounts of data with a compatible PC through an optical-fiber connection.
Q2: Is this the PC-side HSSB board?
No. This model is the NC-side/CNC-side interface board. The HSSB arrangement uses a CNC-side board and a separate PC-side interface board, connected through optical fiber.
Q3: Which FANUC controls is it normally associated with?
It is associated with i-Series controls such as 16i, 18i, and 21i, and is installed in the CNC basic unit rather than in a general external communication box.
Q4: Why is the COP7 connector important?
The COP7 connector is the optical connection point used by the HSSB link. Because the board communicates by optical fiber, connector condition and cable compatibility matter directly to communication stability.
Q5: What should be checked before replacing this board?
Confirm the exact part number, verify that the machine actually uses HSSB, inspect the optical connector and fiber condition, and check that the paired PC-side interface board is compatible.
Since this board belongs to the communication layer, a fault diagnosis should include the full HSSB path rather than only the CNC card.
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