- The Sinumerik 810D/840D is part of the changeable control WinNC. WinNC allows the user to learn all CNC industry controls that are common on the market, on a single machine. One of these controls is the 810D/840D. It corresponds in handling and function the particular original control and it can be used on a commercial PC. The user has the possibility to work on the PC as well as on the machinecontrol and gets familiar with all aspects of control programming in detail.