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difference between PLC cables ??????

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marsu1821:
Anybody could explain what is the difference between S7 200 cable and S7 300 cable for S7 Siemens PLC?
I know these two cables must convert data signals from computer (RS232) to PLC (RS485) in order to program PLC...but I don't understand why they are different in the catalog...

Thank you for advance

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