Description
x📌 FANUC A20B‑2902‑0411 — 6 MB Flash ROM + 256 KB SRAM Memory Module
Description:
The A20B-2902-0411 is a combined memory module used in FANUC CNC control systems. It includes both Flash ROM (FROM) and static RAM (SRAM) on a single board:
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🧠 Flash ROM: 6 MB non-volatile memory used to store the CNC controller’s firmware, system code, and essential program storage.
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💾 SRAM: 256 KB static RAM used as working memory for runtime data, buffering, and parameters.
This memory module is part of the A20B-2902 product family and typically fits into the memory subsystem of FANUC CNC controllers, especially older or mid-generation systems such as Series 16, 18, and 21-series machines.
Function & Use:
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Acts as core system memory — the controller uses the Flash ROM to load essential firmware and the SRAM as operational memory while the machine is running.
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Without this module installed and correctly loaded with the required files, the CNC cannot boot or operate normally.
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This module is commonly replaced or upgraded when the CNC loses stored programs, faults on memory errors, or requires more storage than the original memory board provided.
Important Notes:
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🔄 After installing or replacing this module, you must reload all FROM files, parameters, and part programs from backup into the CNC — because the SRAM portion is volatile and the Flash ROM may not contain the machine’s specific data.
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Availability may vary; some suppliers do not accept core exchange or repair on this part, so confirm with your vendor.
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.
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