The Siemens 6ES7972-0CB20-0XA0 is the PC Adapter USB, a programming adapter designed to connect a PC or notebook to SIMATIC S7-200, S7-300, S7-400, and C7 controllers via MPI, PROFIBUS DP, or PPI. It is the classic USB-based replacement for the older RS-232 serial programming cables, addressing the lack of serial ports on modern laptops.
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