Technical data

Topologies of SIMATIC NET PROFIBUS networks
2.4 Topologies with PROFIBUS PA
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
39
Spur line
The maximum permitted length for spur lines can be found in the table below. You should
also remember the maximum length of the total cable (see above).
Maximum length of the spur line
Number of spur lines
DP/PA coupler DP/PA coupler Ex [ia]
1 to 12 Max. 120 m Max. 30 m
13 to 14 Max. 90 m Max. 30 m
15 to 18 Max. 60 m Max. 30 m
19 to 24 Max. 30 m Max. 30 m
25 to 32 < 1 m < 1 m