Networking
5-16
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Lengths of Spur Lines
If you do not fit the bus cable directly at the bus connector (for example, when
using a PROFIBUS-DP bus terminal), you must take into account the maximum
possible spur line length.
The following table gives the maximum lengths of spur lines allowed per bus
segment:
Upward of 3 Mbps use PG connecting cable, order no. 6ES7 901-4BD00-0XA0, to
connect the programming device or PC. You can use two or more PG connecting
cables with this order number in one bus configuration. Different spur lines are not
allowed.
Table 5-3 Lengths of Spur Lines per Segment
Transmission Rate Max. Lengths of Spur
Lines per Segment
No. of Nodes per Spur Line Length
of ...
1.5 m or 1.6 m 3 m
9.6 to 93.75 Kbps 96 m 32 32
187.5 Kbps 75 m 32 25
500 Kbps 30 m 20 10
1.5 Mbps 10 m 6 3
3 to 12 Mbps - - -
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