Siemens 6FC5357-0BB33-0AE1 is the SINUMERIK 840D/DE NCU 573.2 numerical control unit, the central processor module for SINUMERIK 840D/DE CNC systems. It uses a Pentium II processor, ships without system software memory, and provides 2.5 MB of NC memory and 96 KB of PLC memory with PROFIBUS-DP prepared connectivity. This NCU 573.2 component is designed to serve as the CNC core within the SINUMERIK 840D/DE architecture, enabling reliable motion and control for machine tools in that platform. In supplier listings it is also identified as 6FC53570BB330AE1, reflecting alternate catalog references for the same Siemens part.
