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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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SIEMENS
e.g., CPU 31xC
SIEMENS
e.g., CPU 312, 314, or 315-2 DP
CPU
Accessory:
Front connectors (for CPUs with
integrated peripherals)
This runs the user program,
supplies 5 V to the S7-300
backplane bus; communicates
with other nodes of an MPI
network via the MPI interface.
Additional properties of specific
CPUs:
• DP master or DP slave in a
PROFIBUS subnet
• Technological functions
• Point-to-point connection
RUN
STOP
MRES
BF1
BF2
SF
DC5V
FRCE
RUN
STOP
e.g., CPU 317-2 DP
Signal modules (SM)
(Digital input modules, digital
output modules, digital I/O
modules, analog input modules,
analog output modules, analog
I/O modules)
Accessory:
Front connectors
They match different process
signal levels to the S7-300.
Function modules (FM)
Accessory:
Front connectors
These perform time-critical and
memory-intensive process signal
processing tasks, such as
positioning or regulation.
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