Description
📌 FANUC A20B‑2902‑0643 — 256 K SRAM Module with Serial Spindle Support
Description:
The A20B‑2902‑0643 is a memory board (SRAM module) used inside FANUC CNC control systems. It provides 256 KB of static RAM (SRAM) along with support for a serial spindle interface, and is part of the A20B‑2902 series of control PCBs.
Key Features & Function:
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📦 Module Type: 256 K SRAM module — adds working memory to the CNC controller for system operations and temporary storage.
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🔄 Serial Spindle Support: Includes circuitry/support for a serial spindle interface, meaning it’s designed to work with systems that use serial communication for spindle control or feedback.
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🛠️ Series: Part of the A20B‑2902 family of FANUC control boards, which includes memory boards, display interface modules, servo interface boards, etc.
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🔌 Application: Installed on the controller rack backplane of compatible FANUC CNC systems to provide essential working memory and spindle‑related data functions.
Typical Usage:
This board is used in FANUC CNC electronics where the system needs reliable SRAM for program buffering, parameter storage during operation, and communication with serial‑type spindle modules. After replacing or installing the module, it’s typically necessary to reload parameters and programs to the controller so it can function correctly with the new memory module.