Description
📌 FANUC A20B‑2003‑0280 — 3‑Slot Backplane PCB
The A20B‑2003‑0280 is a backplane printed circuit board (PC board) used inside FANUC CNC controller chassis as the back panel/backplane where other control modules plug in.
🧩 What It Is
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Part Number: A20B‑2003‑0280
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Function: A 3‑slot backplane PCB — this board provides the physical and electrical slot connections for up to three plug‑in control cards (e.g., CPU, communication, memory, display modules) inside the FANUC controller rack.
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Series: Part of the FANUC A20B‑2003 backplane/back panel series.
🧠Key Role
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Serves as the physical structure and electrical interface between the controller’s main electronics and peripheral boards.
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Supports three card slots, allowing multiple modules to be installed and interconnected.
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Without a functioning backplane like this, the controller can’t provide power or proper signaling to other boards — meaning the CNC would fail to initialize or run properly.
🛠️ Typical Use Cases
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Commonly found in FANUC Series 16i, 18i, or 21i controllers with modular card‑based architecture.
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Used in compact or modular CNC units requiring a small number of boards (e.g., CPU + I/O + display).
🔧 Notes
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Most suppliers sell this as new, refurbished/tested, or surplus — some offer core exchange or repair services.
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If damaged, the whole controller rack may not power up or communicate between boards correctly.