Siemens Simatic S7-300 CPU 31xC Series - Network Components of MPIDP and Cable Lengths

Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-35
Devices capable of PROFIBUS DP communication
• PG/PC
• OP/TP
• DP slaves
• DP master
• Actuators/Sensors
• S7-300/S7-400 with PROFIBUS DP interface
Reference
Further information on PROFIBUS: http://www.profibus.com
4.11.2.5 Network components of MPI/DP and cable lengths
MPI subnet segment
You can install cables with a length of up to 50 m in an MPI subnet segment. This length of
50 m is the distance between the first and the last node of the segment.
Table 4-17 Permissible cable length of a segment on the MPI subnet
Transmission rate S7-300 CPUs (common
potential
MPI) without CPU 317
CPU 317
19.2 kbps
187.5 kbps
50 m 1000 m
1.5 Mbps 200 m
3.0 Mbps
6.0 Mbps
12.0 Mbps
-
100 m
Segment on the PROFIBUS subnet
The maximum cable length of a a segment on the PROFIBUS subnet is determined by the
set transmission rate.
Table 4-18 Permissible cable length of a segment on the PROFIBUS subnet
Transmission rate Maximum cable length of a segment
9.6 kbps to 187.5 kbps 1000 m
500 kbps 400 m
1.5 Mbps 200 m
3 Mbps to 12 Mbps 100 m