Siemens CPU 313C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
9-8 A5E00105492-03
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1. Use a stub cable to connect the commissioning and maintenance PG to the
other subnet nodes. The bus connector of these nodes must be equipped with a
PG socket.
The figure below shows the interconnection of two networked S7-300 and a PG.
SF
BUSF
DC5V
FRCE
RUN
ST OP
SIEM EN S
PS
SM
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
CPU
PS
SM
PG
1
2
2
3
CPU
Figure 9-3 Connecting a PG to a subnet
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 Stub cable used to create connection between PG and CPU
 Inserted terminating resistor of bus connector
 PROFIBUS bus cable used to network the two CPUs
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