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 
same address at the FF segment.
● You have to change the device addresses of FF devices that have been assigned to one 
of the temporary addresses.
 
 
Basics of the FOUNDATION Fieldbus
2.3 Device addresses
FOUNDATION Fieldbus
12 Commissioning Manual, 03/2013, A5E03880935-02