Cable Length; Permissible Cable Lengths In An Mpi Subnet Segment - Siemens SIMATIC S7-300 Hardware And Installation Manual

Configuring
4.10.5

Cable length

MPI Subnet Segment
You can implement cable lengths of up to 50 m in an MPI subnet segment.The
50 m is measured from the first to the last node of the segment.
Table 4-21
Transmission rate
19.2 Kbps
187.5 Kbps
1.5 Mbps
3.0 Mbps
6.0 Mbps
12.0 Mbps
Segment in the PROFIBUS Subnet
The cable length in a segment of a PROFIBUS subnet depends on the
transmission rate.
Table 4-22
9.6 Kbps to 187.5 Kbps
500 Kbps
1.5 Mbps
3 Mbps to 12 Mbps
Longer cable lengths
If you want to implement cable lengths above those permitted in a segment, you
must use RS485 repeaters. Information on this topic is found in the RS485
Repeater product information.
Length of the stub cables
If you do not want to install the bus cable directly in the bus connector (for
example, when using an L2 bus terminal), you must take into account the
maximum length possible for the stub cable.
4-38

Permissible cable lengths in an MPI subnet segment

S7-300 CPUs
(without CPU 318-2 DP)
(non-isolated
MPI interface)
50 m
-
Permissible cable lengths in an MPI subnet segment
Transmission rate
1,000 m
M 200
M 100
Maximum cable length in a segment
1,000 m
M 400
M 200
M 100
S7-300 Programmable Controller Hardware and Installation
CPU 318-2 DP
(isolated
MPI interface)
A5E00105492-01