Siemens Simatic PCS 7 Commissioning Manual page 12

Basics of the FOUNDATION Fieldbus
2.3 Device addresses
The device addresses 248 to 251 have been reserved for automatic address conflict resolution
at the FF segment.
Note
The device address that was assigned to an FF device by automatic address conflict
resolution will not be saved in the FF device.
Note the following when you use automatic address conflict resolution:
● You may not connect or switch on for the first time more than 4 new FF devices with the
● You have to change the device addresses of FF devices that have been assigned to one
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same address at the FF segment.
of the temporary addresses.
Commissioning Manual, 03/2013, A5E03880935-02
FOUNDATION Fieldbus