Siemens S7-MPI

The part supplementary data of error messages of MPI driver may contain following data:

•	BCC is the received BCC byte in hexadecimal format

•	data_address is the start address of data accessed by the request in the MPI address notation

•	data_size is the size of data accessed by the request expressed like a number of data words in decimal format.

•	direction (from the point of view of the terminal) is:

- "rcv" for transmitting data from the slave to the master

- "snd" for transmitting data from the master to the slave

•	error_code is the error response code in hexadecimal format

•	station is the decimal station number of the accessed slave

The MPI address notation is like this:

DB<data_segment>,DW<data_word>

•	data_segment is an unsigned number in decimal format

•	data_word is an unsigned number in decimal format