Siemens S7-300 - Connecting a PG to a Subnet

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
9-10 A5E00203919-01
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1. For commissioning or service, connect the programming device (PG) to a
subnet node by means of a stub cable. The bus connector of this node must be
equipped with a PG socket.
2. You must energize the terminating resistor for the bus cable connectors going
into the CPU.
3. You use a PROFIBUS bus cable to network the CPUs.
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 9-5 Connecting a PG to a subnet
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 Stub cable used to create connection between PG and CPU
 Energized terminating resistor of the bus cable connector
 PROFIBUS bus cable used to network both CPUs