Commissioning
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
8-11
PROFIBUS bus cable
PG cable
= spur line
S7-300
S7-300
PG
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
Figure 8-6 Connecting a PG to a subnet
MPI addresses for service PGs
If there is no stationary PG, we recommend:
To connect it to an MPI subnet with "unknown" node addresses, set the following
addresses on the service PG:
• MPI address: 0
• Highest MPI address: 126.
Using STEP 7, you then determine the highest MPI address in the MPI subnet and
adapt the highest MPI address in the PG to that of the MPI subnet.
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