Hi,

let me try to answer these two questions:

to 1: it should be no big issue to change the IM CPU back from DP to MPI. I think the only thing would be to reset the CPU and to clear the MMC with a PG. After Clearing the MMC and resetting the CPU it should also be accessible over MPI again.

to 2: The main difference between DP and MPI is:

DP is a Network to connect peripheral nodes, usually without any logic inside,to one Master unit / controller.

MPI is a Network usually used to program PLC’s, in some cases also usable for HMI uses or small communication uses in between small PLC’s.

Best regards.