To connect via MPI:
Be sure that the PG/PC Interface is set to S7ONLINE=CP5611(MPI), and the parameters are MPI node = 0, baudrate = 187.5kbps.
To connect via DP:
Be sure that the PG/PC Interface is set to S7ONLINE=CP5611(Profibus), and the parameters are DP node = 1, baudrate and busprofile must match the configuration of your DP network.