Example: Maximum Distances In The Mpi Subnet - Siemens SIMATIC S7-300 Hardware And Installation Manual

Example: Maximum distances in the MPI subnet

The figure below shows you:
• a possible MPI Subnet configuration
• maximum distances possible in an MPI subnet
• the principle of "Line extension" using RS485 repeaters
S7-300
SF SIEMENS
BUSF
OP 27
DC5V
FRCE
RUN
STOP
3 4
S7-300
SF
SIEMENS
BUSF
OP 27
DC5V
FRCE
RUN
STOP
11
10
Terminating resistance on
PG connected via spur line for maintenance purposes
0 ... x
MPI addresses of nodes
Figure 4-15 Example: Maximum distances in the MPI subnet
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
S7-300
S7-300
SF SIEMENS SF SIEMENS
BUSF BUSF
DC5V DC5V
FRCE FRCE
RUN RUN
STOP STOP
5
PG spur line
0
max. 50 m
S7-300
SF SIEMENS
BUSF
OP 27
DC5V
FRCE
RUN
STOP
9
8
max. 50 m
PG
RS 485-
Repeater
7
6
RS 485-
Repeater
Configuring
max.
1000 m
4-41