Configuring
S7-300 Programmable Controller Hardware and Installation
4-38 A5E00105492-01
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 Permissible cable lengths in an MPI subnet segment
Transmission rate S7-300 CPUs
(without CPU 318-2 DP)
(non-isolated
MPI interface)
CPU 318-2 DP
(isolated
MPI interface)
19.2 Kbps
187.5 Kbps
50 m 1,000 m
1.5 Mbps M 200
3.0 Mbps
6.0 Mbps
12.0 Mbps
-
M 100
Segment in the PROFIBUS Subnet
The cable length in a segment of a PROFIBUS subnet depends on the
transmission rate.
Table 4-22 Permissible cable lengths in an MPI subnet segment
Transmission rate Maximum cable length in a segment
9.6 Kbps to 187.5 Kbps 1,000 m
500 Kbps M 400
1.5 Mbps M 200
3 Mbps to 12 Mbps M 100
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.
To Next Page
Loading...
Need help?
General
