Specifications

4 Communication settings and guide of HMI connecting with controller
2. This protocol supports multi-station communication, and the MPI is RS485 port, so we can use this
protocol to communicate between many HMI and PLC, and then we must set the master station number.
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 can be 187.5K or 19.2K.
5. You must set DB first, or register cannot write（DB.DBX, DB.DBW, DB.DBD. The initial address of
DBm.DBW and DBm.DBD must be even number.
6. This protocol doesn’t support direct simulation and indirect simulation.
PLC Setting
1. PLC station No. can be 0~15.
2. MPI baud rate can be 19.2k or 187.5k.
SIEMENS MPI Direct protocol
HMI setting
Default parameter:19200bps, 8, none, 1; station number:2
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