Siemens CPU 312C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
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An S7-300 consists of several modules. The following diagram illustrates a
possible configuration:
SF
BUSF
DC5V
FRCE
RUN
STOP
SF
BUSF
DC5V
FRCE
RUN
STOP
1 2 3
4
5
Figure 4-1 Modules in an S7-300
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 Power supply (PS)
 Central processing unit (CPU)
The example in the figure shows a CPU 31xC with integrated I/O.
 Signal module (SM)
 PROFIBUS bus cable
 Cable for connecting a programming device (PG)