FANUCA20B-2902-0351CNC Memory Module, 768 K Battery-Backed SRAM Daughter Board, F16B / Series 16-18

Product Description

What this part is

A Fanuc A20B-2902-0351 memory module. It is a daughter board, catalogued at 768 K of SRAM, that mounts onto an F16B-generation Fanuc CNC main board — the board family behind the Series 16 and Series 18 controls. Its function is memory capacity: part-program storage, parameters, macros and tool data.

Decoding the order code

A20B: Fanuc drawing prefix for a smaller printed circuit board, typically a daughter or option card. The larger main boards carry the A16B prefix, and A86L is reserved for bought-in components. 2902: drawing group. The 29xx groups belong to the later Fanuc CNC generations. 0351: the specific module. 04B: drawing revision level, marked on the board.

What SRAM memory means for this machine

Fanuc SRAM memory is volatile and battery-backed. Capacity is a hardware fact rather than a setting. The contents live as long as the backup battery holds.

Published specifications

Function: CNC memory module, part-program and parameter storage. Memory type: SRAM, battery-backed. Capacity: 768 K, as catalogued for this drawing number. Platform: Fanuc F16B main board generation, Series 16 and Series 18 family controls. Fanuc drawing number: A20B-2902-0351. Revision seen on this drawing: 04B. Form factor: daughter board, mounts on the host CNC main board. Country of manufacture: Japan.

Mounting data

The module seats on board-to-board connectors on the host CNC main board, in a defined connector position and orientation. Memory-related alarms and a memory-clear sequence follow the first power-up after new memory hardware is fitted.

Quantity and configuration

One memory module.

Interchange guidance

The full drawing number is the ordering reference. The neighbouring A20B-2902 modules are different capacities and different functions. A20B-2902-0531 is a separate board. Also written A20B29020351, A20B 2902 0351, A20B-2902-0351/04B and A20B-2902-0351#04B.