Fanuc FROM/SRAM Module A20B-3900-0251 (31i-B)

The Fanuc A20B-3900-0251 is a FROM/SRAM memory module for the Fanuc Series 31i-Model B CNC, also used across the Fanuc 30i-B / 31i-B / 32i-B control family. The FROM section stores the control software and user software, while the battery-backed SRAM section holds parameters, programs and offsets — take a full memory backup before swapping this module.

• Part number: A20B-3900-0251
• Series: Fanuc 31i-Model B
• Type: CNC Memory Module (FROM/SRAM)
• Note: SRAM is battery-backed — back up parameters and programs before replacement
• Availability: New, used and refurbished — tested before dispatch