Five classes of Hi-End numerical control systems may be distinguished in terms of their architecture. The first class is computerized numerical control (CNC), based on a PC. In the second class, PCNC-1 (Personal Computer Numerical Control), the computer is only used to operate the terminal. The third class, PCNC-2, requires two computers: the first provides the core of the real-time numerical control system; the other operates the terminal. This class includes modern numerical control systems with the most powerful computer resources, such as SINUMERIK 840D (Siemens), Typ3-osa (Bosch), PA8000 (Power Automation, and Andronic 2000 (Andron); all these manufacturers are German.
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