Siemens PC adapter USB connected to the S7-300 PLC, but the communication is not on, the driver is installed, I remember that after selecting the MPI interface in the Set PG/PC, it depends on the baud rate, it seems to be 1.5M, then in the device management Inside the Ports, find the U port of this line, modify the parameters of this U port, consistent with the properties inside the MPI line to successfully connect, now can not find this U port in Ports. Where can I modify it? ? ?
The PLC connection of Siemens S7-300 and S7-200 does not require setting the baud rate. It can be obtained directly by searching. When connecting, pay attention to the default baud rate and the dialing code on the programming cable.
PLC Cable 