Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 23

Component
Signal modules (SM)
Digital input modules
•
Digital output modules
•
Digital I/O modules,
•
Analog input modules
•
Analog output modules
•
Analog I/O modules
•
Accessories:
Front connectors
•
Function modules (FM)
Accessories:
Front connectors
•
Communication processor (CP)
Accessories: Connecting cable
SIMATIC TOP connect
Accessories:
Front connector module with ribbon
•
cable terminals
Interface module (IM)
Accessories:
Connecting cable
•
PROFIBUS cable with bus connector
PG cable
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
Function
The SM matches different process
signal levels to the S7-300.
The FM performs time-critical and
memory-intensive process signal
processing tasks.
Positioning or controlling, for example
The CP relieves the CPU of
communication tasks.
Example: CP 342-5 DP for connecting
to PROFIBUS DP
Wiring of digital modules
The IM interconnects the various rows
in an S7-300
Interconnect the nodes of an MPI or
PROFIBUS subnet
Connects a PG/PC to a CPU
3.2 Overview of the vital modules of an S7-300
Illustration
S7-300 components
3-3