The Siemens 6FC5357-0BA32-0AE1 Sinumerik NCU is part of the Siemens Sinumerik series. It is a Sinumerik 840D NCU 573 which is the standard version. It is used with 5 axes/spindles, the max being 8. The memory is NC 1.5MB, PLC 64KB, with the max being 192KB. This 6FC5357-0BA32-0AE1 is used for I/O systems. It has S7-IM361, Profibus-DP with system software. It has a specific connecting cable for unit bus.