The Siemens product 6FC5210-0DA21-0AA1 is a main memory control module designed for SINUMERIK CNC systems, including models like FM NC, 810D/DE, and 840D/DE. This unit, known as the MMC102, comes equipped with integrated system software and features an Intel 486DX2-66 processor paired with 16MB of RAM on a hard drive, providing 200MB of available storage space. For those upgrading or replacing older systems, this product succeeds the previous version 6FC5210-0DA20-2AA1. BSP Automation distributes this reliable and robust memory control solution, supporting smooth and efficient CNC operations.