Example: Maximum Distances In The Mpi Subnet - Siemens CPU 313C Hardware And Installation Manual

&RQILJXULQJ
([DPSOH 0D[LPXP GLVWDQFHV LQ WKH 03, VXEQHW
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
3
PS CPU CPU
OP 27
MPI addr. 3
MPI addr. 4
1
S7-300
3
PS
OP 27
MPI addr. 11
1
Figure 5-15 Example: Maximum distances in the MPI subnet
 Terminating resistor inserted
 PG connected by means of a stub cable for maintenance purposes
5-44
S7-300
3 3
PS CPU CPU
MPI addr. 5
2
PG
MPI addr. 0
max. 50 m
CPU CPU
OP 27
MPI addr. 9
MPI addr. 10
max. 50 m
.H\ WR QXPEHUV LQ WKH ILJXUH
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
S7-300
PG
PS CPU CPU
MPI addr. 6 MPI addr. 7
S7-300
3
PS CPU CPU
MPI addr. 8
1
RS 485-
Repeater
1
max. 1000 m
1
RS 485-
Repeater
1
A5E00105492-03