Siemens SIMATIC PCS 7 Configuration Manual page 106

Configuration of the hardware (AS and I/O)
6.4 Settings for CP 443-5 Ext as PROFIBUS master
Settings in the "General" tab
1. Open the properties dialog of the CP 443-5 Ext in HW Config.
Note
Always assign address 2 to the CP 443-5 Extended as the PROFIBUS master. Address 1
should be reserved for connecting a programming device to the PROFIBUS for servicing
purposes. Address 0 is reserved for connection of the ES to the PROFIBUS.
2. Establish a connection to the PROFIBUS network. Press "New" to create a new PROFIBUS
network for each additional CP 443-5 Extended.
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Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA