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The SINAMICS S120/SINAMICS S150 Control Units can communicate with one another via PROFIBUS or PROFINET/Ethernet, or over a serial RS232 interface, depending on the Control Unit version (DP or PN).
The PG/PC will require a PROFIBUS communications board and a connecting cable for this purpose.
If the optional CBE20 PROFINET Communication Board is available, this can be used instead to provide an Ethernet communications link between the CU320 2 and PG/PC.