Network Samples; Example Of An Mpi Subnet - Siemens SIMATIC S7-300 Hardware And Installation Manual

Configuring
4.10.6

Network samples

Example: MPI subnet
The figure below shows you the block diagram of an MPI subnet.
S7-300**
OP 27**
SF
SIEMENS
BUSF
DC5V
FRCE
RUN
STOP
1
2
S7-300
SF SIEMENS
BUSF
DC5V
FRCE
RUN
STOP
13
0
PG*
*Connected via spur lines for commisioning/maintenance only
(with default MPI address).
** connected to the MPI subnet later (with default MPI address).
*** the CP also has a PROFIBUS address in addition to the MPI address ( address 7 here).
**** In the case of the CPU 318-2 DP, the FMs/CPs do not have their own MPI address. In the case
of the S7 300 CPUs, (without CPU 318-2 DP) you can also allocate MPI addresses as you wish.
0 ... x MPI addresses of nodes
Terminating resistance on
Figure 4-14 Example of an MPI subnet
4-40
S7-300
S7-300
SF
SIEMENS
SF SIEMENS BUSF
BUSF BUSF
DC5V
DC5V
FRCE
FRCE
RUN
RUN
STOP
STOP
4
3
S7-300
SF
SIEMENS
BUSF
OP 27
DC5V
FRCE
RUN
STOP
12 11
S7-300 Programmable Controller Hardware and Installation
S7-300
PG
SF
SIEMENS
BUSF
DC5V
FRCE
RUN
STOP
5 6
S7-300
SF
SIEMENS
BUSF
DC5V
OP 27
FRCE
RUN
STOP
8
10
CP****
PROFI-
BUS-
Subnetwork
7
FM****
9
A5E00105492-01