A20B-3900-0224
May 22, 2026

A20B-3900-0224

Part Number: A20B-3900-0224 Manufacturer: FANUC Type: FROM/SRAM DIMM memory card Status: Discontinued, available in stock new, refurbished and used Form: Compact plug-in module

Description

Part Number: A20B-3900-0224
Manufacturer: FANUC
Type: FROM/SRAM DIMM memory card
Status: Discontinued, available in stock new, refurbished and used
Form: Compact plug-in module

Compatibility

Applicable CNC: 16i-B, 18i-B, 21i-B
Mounted slot: Dedicated memory slot on main CPU board

Specifications

FROM capacity: 32MB
SRAM capacity: 2MB
Supply voltage: 3.3V DC
Operating temperature: 0°C ~ 55°C
Humidity: 5%-95% RH, non-condensing
Interface: FANUC proprietary edge connector

Main Functions

Store CNC system firmware and PMC programs
Save running parameters, tool offset and real-time data
Built-in backup battery keeps data after power off
Support system firmware upgrade and recovery

Installation Notice

Power off equipment and wait 5 minutes before operation
Use anti-static protection to avoid component damage
Align card notch correctly, do not install forcibly
Replace backup battery regularly to prevent data loss

Troubleshooting

Boot error: Check card installation and battery voltage
Data missing: Recover data after battery inspection
System abnormality: Confirm matching CNC model

Model Comparison

A20B-3900-0163: 32MB FROM, 1MB SRAM, old version
A20B-3900-0223: 32MB FROM, 1MB SRAM, updated version
A20B-3900-0224: 32MB FROM, 2MB SRAM, larger runtime memory


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