Description
FANUC 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.