Siemens SIMATIC NET PROFIBUS Owner's Manual page 45

Table 2-2
Number of tap lines
1 to 12
13 to 14
15 to 18
19 to 24
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Topologies of SIMATIC NET PROFIBUS Networks
Tap Line Lengths for DP/PA Couplers
max. 120 m
max. 90 m
max. 60 m
max. 30 m
Maximum length of the tap line
DP/PA coupler
max. 30 m
max. 30 m
max. 30 m
max. 30 m
DP/PA coupler Ex [i]
2-19