Siemens 6FC5357-0BB33-0AE0 Numerical Control Unit

Siemens 6FC5357-0BB33-0AE0 Numerical Control Unit (NCU 573.2) is the central CPU module for SINUMERIK 840D/DE CNC systems. It provides 32 MB of DRAM and 1.5 MB of NC memory, plus 64 KB PLC memory, and is shipped without system software memory. This Pentium II‑class processor (266 MHz) based NCU handles real‑time CNC motion control and PLC tasks within SINUMERIK 840D/DE configurations and is prepared for PROFIBUS‑DP communication to connect with compatible field devices. The 6FC5357-0BB33-0AE0 designation identifies the 573.2 variant, a common component cited in Siemens documentation and third‑party catalogs for SINUMERIK 840D/DE installations.