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
SIEMENS
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