S7-300 components
3.2 Overview of the vital modules of an S7-300
S7-300, CPU 31xC and CPU 31x: Installation
3-2 Operating Instructions, Edition 08/2004, A5E00105492-05
3.2 Overview of the vital modules of an S7-300
You can choose from a number of modules for installing and commissioning the S7-300. The
most important modules and their functions are shown below.
Table 3-1 S7-300 components:
Component Function Illustration
Mounting rail
Accessories:
• Shielding terminal
S7-300 racks
Power supply (PS) module The PS converts the line voltage
(120/230 VAC) into a 24 VDC operating
voltage, and supplies the S7-300 and
its 24 VDC load circuits.
SIEMENS
A CPU 31xC, for example
A CPU 312, 314, or 315-2 DP, for
example
CPU
Accessories:
• Front connectors (CPU 31xC only)
The CPU executes the user program,
supplies 5 V to the S7-300 backplane
bus, and communicates with other
nodes of an MPI network via the MPI
interface.
Additional features of specific CPUs:
• DP master or DP slave on a
PROFIBUS subnet
• Technological functions
• PtP communication
• Ethernet communication via
integrated PROFINET interface
A CPU 317, for example
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