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4.3.1
Selecting the Station Number for PROFIBUS-DP
Definition
With the station number, you identify every station of the PROFIBUS-DP.
The station number represents the name used by the DP master to address
individual stations.
Selecting station
With switch 8 of the DIP switch block (refer to Fig. 4-3), you define whether
numbers
the station number in the EEPROM or the station number on the DIP switch
block is valid.
Table 4-4
Range of values
You can set the station number within the range between 0 and 125. Station
numbers 126 and 127 are not authorized.
Address 126 is used to identify new DP slaves. Address 127 is reserved for
sending messages to a group of stations (multicasting, a sub-form of broad-
casting).
Note that you cannot use station numbers 124 and 125 with IM 308-C.
IM 308-C does not support diagnostics for these two station numbers.
Modifying station
If you use the station number stored in the EEPROM, you can modify it dur-
numbers
ing operation, as described in section 4.3.3.
You cannot modify the station number set with the DIP switch block during
operation. If you alter the station number on the DIP switch block, the new
station number is only taken into account after a cold restart.
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
Station number selection on DIP switch block
Switch 8
OFF
Station number on DIP switch block is
valid. The station number in the EEPROM
is reset to station number 126
ON
Station number in the EEPROM is valid
Installing and Wiring the DP/ASi Link
Meaning
Refer to
Section 4.3.2
Section 4.3.3
4-11
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