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S7 MPI prog cable RS232 Siemens
Part No: 6ES7 972-0CA21-0XA0
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Siemens Genuine PC/PLC Programming Cable (MPI -Adapter), 5m.

Program cable for Siemens STEP7 S7-300, S7-400, and for VIPA WinPLC7 100V, 200V, 300V, 400V, 500V, SPEED7

Note: STEP7 5.5 SP2 and newer no longer supports serial COM ports including virtual COM ports when using Windows7 64bit. TIA Portal does not support COM ports at all, no matter which version of the operating system is used.