Description
xFANUC A20B-3300-0310 is a central CPU module / printed circuit board (PCB) used in industrial CNC controller systems by FANUC — specifically designed for the 16i-B and 18i-B series controls found on many machine tools.
📌 Overview of A20B-3300-0310
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Part Type: CPU module / control PCB
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Processor: Pentium-based controller with onboard DRAM (16 MB) for processing CNC logic and system functions.
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Memory: 16 MB DRAM integrated directly on the board.
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Usage: Installed internally in the CNC cabinet as the core processing unit that executes control logic, G-code interpretation, and communication with I/O and servo/drive systems.
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Compatibility: Designed for FANUC Series 16i-B and 18i-B controllers (older “i-B” generation CNC systems) used on milling machines, lathes, and other industrial automation equipment.
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Form Factor: Printed circuit board that plugs into the controller’s main board or CPU slot.
🧠 What It Does
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Acts as the primary computing brain of the CNC controller, handling core processing tasks such as motion control algorithms, program execution, and system interrupts.
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Works alongside other boards in the control system — such as power supplies, I/O modules, graphics or communication interfaces — to fully operate the machine tool.
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When this board fails or is faulty, machines typically won’t boot or may throw CPU-related alarms.
🛠️ Typical Context & Notes
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It’s a legacy part for older FANUC CNC systems (Series 16i/18i).
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Often available new, surplus, or refurbished through third-party vendors, sometimes with repair or testing options.
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Replacing this board usually requires restoring backed-up machine parameters and programs, since the controller may lose configuration data when CPU/Dram modules are swapped.
Additional Information
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Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Custom Tab
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