Siemens 6FC5357-0BB34-0AE1 Numerical Control Unit

Siemens 6FC5357-0BB34-0AE1 is the SINUMERIK 840D/DE NCU 573.4 processor module, a 650 MHz control unit designed to run the CNC kernel and PLC interface for SINUMERIK 840D systems. It includes 64 MB DRAM for system software, 2.5 MB of dedicated NC memory, and 96 KB of PLC memory, and is supplied without a fan box and without preinstalled system software. The MLFB identifier is 6FC5 357-0BB34-0AE1, placing it squarely in the SINUMERIK 840D/DE NCU 573.4 family. This module is prepared for PROFIBUS DP communication, enabling reliable integration with a wide range of industrial automation configurations. In practice, it serves as a compact, high-speed computation and I/O coordination hub for CNC environments, consolidating motion control and PLC tasks within SINUMERIK 840D ecosystems, and is compatible with configurations described for 810D/840D setups that use PLC314C-2DP components. This combination supports multi-axis coordination and deterministic motion control for complex milling and turning applications. It is designed for upgrade scenarios where a robust, scalable control backbone is required in legacy SINUMERIK 840D installations.