Description
📌 FANUC A20B-2902-0341 — FROM (Flash ROM) & SRAM Memory Module
Description:
The FANUC A20B-2902-0341 is a combined memory module used in FANUC CNC controllers, typically in the Series 16-C and 18-C control systems. It integrates both Flash ROM (FROM) and SRAM memory on a single circuit board, providing essential code storage and working memory for the CNC’s control electronics.
Key Features & Function:
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💾 Memory Type:
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Flash ROM (FROM): Approximately 4 MB of non-volatile memory — stores firmware, machine programs, configuration, and system code that must persist when power is off.
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SRAM: About 256 KB of static RAM — used as working memory for active data, parameters, and intermediate operations during machine running.
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🔌 Application: Installed on the main CPU board of FANUC Series 16/18 controls (and sometimes Series 21) to provide the controller with its core program storage and temporary data space.
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⚙️ Role in CNC: Works as the system memory foundation — storing the controller’s operating programs and providing fast memory access during operation. It’s a critical board; without it the CNC cannot boot or run.
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📍 Physical Form: Plug-in PCB module (surface-mount on board) that sits in a socket on the CNC’s control CPU assembly.