
6 Communication settings and guide of HMI connecting with controller
Siemens S7-300/400 (via MPI port) driver protocol
1. This drive only comport the HMI with MPI port. Don’t support indirect online and direct online
simulation.
2. MPI is RS485 port, so we can use this drive to communicate between many HMI and PLC, and then
we must set the master station No..
3. HMI station No. can be 0~15, PLC station No. must be 0~15, the station No. of HMI and PLC can
not be the same number.
4. PLC baud rate is 187500.
5. You must set DB first, or register can not write(DB.DBX, DB.DBW, DB.DBD). The initial address
of DBm.DBW and DBm.DBD must be even.
6. T/C register must be readonly.
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