Network Components Of Mpi/Dp And Cable Lengths - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

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
Transmission rate
19.2 kbps
187.5 kbps
1.5 Mbps
3.0 Mbps
6.0 Mbps
12.0 Mbps
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
Transmission rate
9.6 kbps to 187.5 kbps
500 kbps
1.5 Mbps
3 Mbps to 12 Mbps
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
Permissible cable length of a segment on the MPI subnet
S7-300 CPUs (common
potential
MPI) without CPU 317
50 m
-
Permissible cable length of a segment on the PROFIBUS subnet
CPU 317
1000 m
200 m
100 m
Maximum cable length of a segment
1000 m
400 m
200 m
100 m
Configuring
4.11 Planning subnets
4-35