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Does Siemens provide RS485 communication line between HMI and plc?
Siemens provides it, but the price is ridiculously expensive.
PPI/MPI communication line (RS485 communication line) will not be lower than 12RMB/ m, 485 connector 120RMB, which is a very outrageous cost ratio.
If it is an occasion with low requirements, it can be completely replaced by a common shielded RS485 wire, and the connector can also be replaced by a 9-pin plug of a computer serial port.
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