2.3 Device addresses
Address ranges in STEP 7 and PCS 7
The following table shows the distribution of address ranges at the FF segment:
Addresses Information on the address range
0 to 15 Reserved by the system (use not permitted)
16 to 19 Reserved area for FF Link (IM 153-2) and FDC 157
● 16: IM for PROFIBUS DP (left IM with redundant configuration of the FF Link)
● 17: with redundant configuration of the FF Link: right IM
20 to 35 SIEMENS Polled Range:
reserved for cyclical data exchange with FF devices (optional expansion up to 50)
36 to 231 SIEMENS Unpolled Range:
FF devices in this address range are only recognized if the "standard range" has been extended. You
can find information on this in section "How to define the device ID of the FF devices (TAG name and
address) (Page 46)".
232 to 247 SIEMENS Reserve Range:
Reserved address range for new FF devices or FF devices that are not in operation, and for FF devices
that are only temporarily connected.
248 to 251 Range for temporary FF devices
● Devices that will be made available and that require a device address.
● Devices that are moved to this range by the automatic address conflict resolution (up to four FF
devices)
● Devices that were removed from processing (using the "Reset address" function)
You will find information on this in the online help of SIMATIC PDM
Note for users:
Make sure that there are always free addresses in this range. Otherwise, FF devices can no longer be
reached by certain actions (for example, "Assign address and TAG").
252 to 255 Range for LAS-compliant temporary FF devices
Automatic address conflict resolution for device addresses
Connected FF devices will be detected automatically at the FF segment.
In case of an address conflict, one of the FF device affected by the address conflict will
automatically be assigned a temporary address during runtime. The procedure is repeated
automatically until the existing address conflicts are resolved.
Basics of the FOUNDATION Fieldbus
2.3 Device addresses
FOUNDATION Fieldbus
Commissioning Manual, 03/2013, A5E03880935-02 11
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