Siemens 6FC5356-0BB11-0AE1 is the NCU 561.3 Numerical Control Unit (MLFB 6FC5356-0BB11-0AE1), the CPU module for the SINUMERIK 840D/840DE system. It is powered by an Intel 486 DX4 100 MHz processor and ships without system software, offering CNC memory of 0.5 MB and PLC memory of 96 KB, prepared for PROFIBUS-DP communications. As the central processing unit of the SINUMERIK 840D DE, this NCU 561.3 module plugs into the standard 840D architecture to execute CNC programs and coordinate motion and PLC tasks. Typical applications are machine tools requiring robust, integrated CNC control within the SINUMERIK 840D family.
