The Fanuc A20B-2902-0224 is a specialized memory module for Fanuc Series 16/18/21 and compatible CNC systems. It provides BSS SRAM backup memory with 256K additional RAM capacity and integrated support for serial spindle control, enabling enhanced data storage, parameter retention during power loss, and reliable serial spindle communication/monitoring. This plug-in PCB features industrial-grade components, robust connectors for direct motherboard integration, and low-power operation on system-supplied voltages. [stock available]