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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-8100-0851 |
The A20B-8100-0851 is a board-level add-on PCB module in the A20B-8100 family. In service inventories and spare-parts channels, this model appears as an add-on card, as PLC Ethernet equipment, and in some listings as a power module or operator-panel / display interface board.
That combination places it in the controller-side expansion and interface layer rather than in the main CPU board category.
For maintenance teams, the practical point is that this board is treated as a fitted option or support board inside the existing control structure.
Because different channels describe it by installed role rather than by a single long-form title, the safest replacement method is to match the exact board code already mounted in the machine.
That approach preserves the original hardware arrangement and avoids mixing board functions inside the same control family.
| Parameter | Value |
|---|---|
| Part Number | A20B-8100-0851 |
| Manufacturer | FANUC |
| Product Type | Add-On PCB / Circuit Board Module |
| Product Series | A20B-8100 |
| Listing Type Seen | Add-On Card Circuit Board PCB Module |
| Inventory Category Seen | PLC Ethernet Equipment |
| Additional Market Description Seen | Power Module |
| Additional Market Description Seen | Operator Panel / Display Interface Board |
This board is suited to installed FANUC control systems where the original hardware already uses the A20B-8100-0851 option or support-board position.
It is especially relevant in board replacement, maintenance stock planning, and refurbishment where the same installed board role needs to be preserved instead of substituted by a visually similar PCB.
Before ordering, check the board label on the installed unit and confirm that the machine actually uses A20B-8100-0851 in that expansion or interface position.
Because listings describe this part through several installed-use channels, verifying the original board code directly on the hardware is the most important replacement step.
Q1: What kind of board is A20B-8100-0851?
It is best treated as a controller add-on PCB module. In spare-parts channels it is listed as an add-on card, and some inventories place it under PLC Ethernet equipment or power-module style categories.
In real service work, that means it belongs to an auxiliary board position inside the control rather than to the main processor board.
Q2: Why do listings describe this board in different ways?
Board-level industrial spares are often cataloged by the role they play inside the installed machine.
For this model, some channels classify it by function in networking or interface inventory, while others group it with controller-side power or panel-related boards.
The exact board code is therefore more reliable than the category label alone.
Q3: Is this a main board?
No description places it clearly in the system motherboard class. The repeated pattern in listings is that it is an add-on or support board within the control structure.
That matters because replacement should focus on the installed board position and code, not on broad family naming.
Q4: Why is exact part-number matching important here?
Because this type of board is selected by installed role. If the wrong support or option board is fitted, the control may keep the same connector style but lose the intended interface or internal function.
Matching A20B-8100-0851 helps keep the original board structure unchanged.
Q5: What should be checked before buying?
Check the installed board code directly on the hardware, confirm the machine uses A20B-8100-0851, and compare the existing board position with the one being replaced.
On models cataloged under multiple inventory labels, direct installed-board verification is the safest purchasing check.
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