Can an xx7 series controller be both a Profibus-DP master and a DP slave?

With the PCD2.M177, a PCD7.F750 master module and PCD7.F770 slave module are required. Alternatively, with the PCD2.M487 the MPI interface can be used as Profibus-DP slave up to a maximum of 1.5 Mbit.

If you want to use a F750 module and a F770 module together on a PCD2.M177 then you have to use mandatory the F770 module on the slot B1 and the F750 module on the slot B2.