Description
๐ A20Bโ3300โ0362 - Related FANUC Part
FANUC A20B-3300-0393 is a servo axis control board used in FANUC CNC systems โ specifically a two-axis servo/FSSB module that handles motion control for up to 2 axes.
๐ง Part Description: A20B-3300-0393
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Part Number: A20B-3300-0393
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Category: Servo Control Module / Axis Control PCB
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Series: FANUC A20B-3300 (axis/servo control boards)
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Function: 2-axis servo control PCB that interfaces with the machineโs FSSB (Field Servo Serial Bus) and drives motion for two axes.
๐งฉ What It Does
This board is not a general main CPU or display board โ instead it focuses on motion/servo control for the CNC:
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Acts as a 2-axis FSSB servo module handling position and speed control for two machine axes (e.g., X/Y, X/Z, etc.).
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Often used in FANUC i-Series controllers (like 16i-B, 18i-B, 21i-B) as part of the axis servo subsystem.
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Installed on the backplane of the CNC control cabinet alongside CPU, display, power, and other control boards.
๐ Typical Application
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Systems: FANUC i-Series (e.g., 16i-B, 18i-B, 21i-B) CNC controllers that use modular servo control architecture.
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Role: Drives motion control for two axes through FSSB communications โ critical for machine tool movement and positioning.
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This board works in conjunction with other system modules (like CPU and I/O boards) to execute coordinated motion control tasks.
๐ ๏ธ Key Features
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2-Axis Servo Module: Handles control for two axes.
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FSSB Interface: Communicates over Field Servo Serial Bus for motion control data.
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Replaceable Module: Often available as new, refurbished, or repairable through industrial parts suppliers.