A20B-3900-0301 Fanuc 128MB/2MB FROM/SRAM Memory Module

Description

Fanuc A20B-3900-0301 is a high-performance combined FROM and SRAM plug-in memory module with physical dimensions optimized for direct mounting on the main system board. This module features a 128 MB Flash ROM (FROM) capacity paired with 2 MB of Static RAM (SRAM) to facilitate high-speed data processing and non-volatile storage. The hardware architecture is designed as a ‘Module P’ type, utilizing a multi-pin connector interface for secure integration into CNC control racks. Its internal circuitry is engineered to manage large ladder programs and complex system configurations without latency, maintaining a lightweight profile of approximately 0.02 kg for minimal mechanical stress on the host PCB.

A20B-3900-0301 Specifications
Model Number: A20B-3900-0301
Brand: Fanuc
Product Category: PLC Module/Rack
Component Type: Combined FROM/SRAM Memory Module
Flash ROM (FROM) Capacity: 128 MB
Static RAM (SRAM) Capacity: 2 MB
Module Designation: Module P
Interface Type: Plug-in Daughter Board
Weight: 0.02 kg
Compatibility: Fanuc Series 31i-B, 32i-B Controls
Storage Functions: System Files, Ladder Logic, Parameters, Part Programs
Mounting Style: Main System Board Slot
Data Retention: Non-volatile (FROM) / Battery-backed (SRAM)

A20B-3900-0301 Applications
Primary applications include integration into Fanuc Series 31i-B and 32i-B CNC control systems for the storage of extensive ladder logic, system executive files, and machining parameters. Deployed within high-precision multi-axis milling centers and automated lathe control racks to manage complex system configurations and large-scale industrial program data.

Additional information