Siemens SIMATIC PCS 7 Configuration Manual page 107

3. You can make the network settings for each PROFIBUS network.
The default "DP" profile is suitable for most use cases, e.g. networks in line structures. A
user-defined profile is required depending on the DP slaves used or the use of optical rings
via Profibus OLM.
Set the transmission rate depending on the connected DP slaves and the length of the
PROFIBUS segment. The default transmission speed of 1.5 Mbps can be adjusted in
individual cases.
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
Configuration of the hardware (AS and I/O)
6.4 Settings for CP 443-5 Ext as PROFIBUS master
107