Description
📌 FANUC A20B-3300-0291 — Part Description
A20B‑3300‑0240 and other A20B-3300 series boards give context — and A20B-3300-0291 is a CPU/processor PCB used inside FANUC CNC controls.
🧠 What It Is
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Part Number: A20B-3300-0291
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Manufacturer: FANUC
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Category: CPU Module / PCB (Processor Board)
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Series: A20B-3300 family — this is a family of control boards for FANUC CNC systems.
⚙️ Function & Purpose
This board is the main processor module — essentially the CPU card — for certain FANUC CNC controllers:
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It contains a 486 processor and 16 MB DRAM, providing the core processing for the CNC control logic.
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Acts as the central computing unit that runs the control firmware, handles motion logic, operator interface commands, and communication between peripheral boards.
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Commonly used in FANUC 210i series and similar control hardware as the principal CPU card.
Note: A20B-3300-0291 is sometimes sold with slight suffix variations (e.g., /02B) indicating specific revisions or configurations for different control cabinets.
🛠️ Typical Usage
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Installed on the main backplane or mounting rack of a FANUC CNC controller.
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Interfaces with other boards such as I/O, display control cards, spindle/encoder interfaces, and power cards.
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A common replacement part when the existing CPU module fails or when refurbishing a CNC controller.
🏭 Technical Highlights
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Processor Type: Intel 486 CPU (embedded on module)
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Memory: ~16 MB DRAM (main working memory)
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Industrial Role: Core processing unit for CNC logic and control management.